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TWI696308B - Organic light-emitting diode display device - Google Patents

Organic light-emitting diode display device Download PDF

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TWI696308B
TWI696308B TW108119784A TW108119784A TWI696308B TW I696308 B TWI696308 B TW I696308B TW 108119784 A TW108119784 A TW 108119784A TW 108119784 A TW108119784 A TW 108119784A TW I696308 B TWI696308 B TW I696308B
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light
emitting layer
energy level
molecular orbital
layer
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TW202017223A (en
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劉振宇
林熙乾
盧宏傑
龔立偉
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宸鴻光電科技股份有限公司
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2101/00—Properties of the organic materials covered by group H10K85/00
    • H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

An organic light-emitting diode display device includes a substrate, a top electrode, a bottom electrode, first and second organic layers, and first, second, and third light-emitting layers. The substrate, the bottom electrode, the first organic layer, the first, second, and third light-emitting layer, the second organic layer, and the top electrode are sequentially stacked. The energy barrier between the energy levels of highest occupied molecular orbitals of the first light-emitting layer and the second light-emitting layer is greater than the difference between the energy levels of highest occupied molecular orbitals of the first organic layer and the first light-emitting layer. The energy barrier between the energy levels of lowest unoccupied molecular orbitals of the first light-emitting layer and the second light-emitting layer is greater than the difference between the energy levels of the lowest unoccupied molecular orbitals of the second organic layer and the third light-emitting layer.

Description

有機發光二極體顯示裝置 Organic light emitting diode display device

本發明是有關於一種有機發光二極體顯示裝置。 The invention relates to an organic light emitting diode display device.

有機發光二極體(Organic Light-Emitting Diode，OLED)為採用發光性之有機化合物的發光元件，具有自發光特性，且其薄型化、顯示品質以及省電特性皆優於液晶顯示器(Liquid Crystal Display，LCD)。由於有機發光二極體具有廣視角、高反應速度、超薄等特性，使得有機發光二極體面板應用範圍愈來愈廣泛。 Organic Light-Emitting Diode (OLED) is a light-emitting device using luminescent organic compounds, has self-luminous characteristics, and its thinness, display quality and power saving characteristics are superior to liquid crystal displays (Liquid Crystal Display) , LCD). Because of its wide viewing angle, high response speed, ultra-thin and other characteristics, organic light-emitting diodes make the application range of organic light-emitting diode panels more and more extensive.

有機發光二極體為藉由電子電洞於發光層中結合而發光。隨著有機發光二極體研究的進步，有人提出在發光層兩側各添加一層阻擋層，希望可以將電子電洞侷限在發光層，增加電子電洞在發光層中結合的機會，此方法確實可以有效的增加元件的發光效率，唯獨這樣的結構會導致多了兩層疊構，且增加材料以及機台的費用的問題。 The organic light emitting diode emits light by combining electron holes in the light emitting layer. With the progress of research on organic light-emitting diodes, it has been proposed to add a barrier layer on each side of the light-emitting layer, hoping to limit the electron holes to the light-emitting layer and increase the opportunity for the electron holes to combine in the light-emitting layer. This method does It can effectively increase the luminous efficiency of the device. Only this structure will lead to the problem of two more stacked structures, and increase the cost of materials and equipment.

本發明之一技術態樣是在提供一種有機發光二極體顯示裝置，用以提升其發光效率並簡化製程。 One technical aspect of the present invention is to provide an organic light-emitting diode display device for improving its luminous efficiency and simplifying the manufacturing process.

根據本發明一實施方式，一種有機發光二極體顯示裝置，包含基板、下電極、第一有機層、第一發光層、第二發光層、第三發光層、第二有機層以及上電極。下電極設置於基板上。第一有機層設置於下電極上。第一發光層設置於第一有機層上。第二發光層設置於第一發光層上，其中第一有機層的最高占據分子軌域(Highest Occupied Molecular Orbital，HOMO)的能階與第一發光層的最高占據分子軌域的能階之間具有第一能階差，第一發光層的最高占據分子軌域的能階與第二發光層的最高占據分子軌域的能階之間具有第一能障，第一發光層的最低未占分子軌域(Lowest Unoccupied Molecular Orbital，LUMO)的能階與第二發光層的最低未占分子軌域的能階之間具有第二能障，第一能障之絕對值大於第一能階差之絕對值。第三發光層設置於第二發光層上。第二有機層設置於第三發光層上，其中第二有機層的最低未占分子軌域的能階與第三發光層的最低未占分子軌域的能階之間具有第二能階差，第二能障之絕對值大於第二能階差之絕對值，第三發光層的最低未占分子軌域的能階介於第二發光層的最低未占分子軌域的能階與第二有機層的最低未占分子軌域的能階之間。上電極設置於第二有機層上。 According to an embodiment of the present invention, an organic light-emitting diode display device includes a substrate, a lower electrode, a first organic layer, a first light-emitting layer, a second light-emitting layer, a third light-emitting layer, a second organic layer, and an upper electrode. The lower electrode is provided on the substrate. The first organic layer is disposed on the lower electrode. The first light-emitting layer is disposed on the first organic layer. The second light-emitting layer is disposed on the first light-emitting layer, wherein the energy level of the highest organic molecular orbital (HOMO) of the first organic layer and the energy level of the highest molecular orbital of the first light-emitting layer are between With a first energy level difference, there is a first energy barrier between the highest occupied molecular orbital energy level of the first light-emitting layer and the highest occupied molecular orbital energy level of the second light-emitting layer, and the lowest unoccupied first light-emitting layer There is a second energy barrier between the energy level of the Lowest Unoccupied Molecular Orbital (LUMO) and the energy level of the lowest unoccupied molecular orbital of the second light-emitting layer, the absolute value of the first energy barrier is greater than the difference of the first energy level The absolute value. The third light-emitting layer is disposed on the second light-emitting layer. The second organic layer is disposed on the third light-emitting layer, wherein there is a second energy level difference between the energy level of the lowest unoccupied molecular orbital region of the second organic layer and the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer , The absolute value of the second energy barrier is greater than the absolute value of the second energy level difference, the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer is between the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer and the first The lowest unoccupied molecular orbital energy level between the two organic layers. The upper electrode is disposed on the second organic layer.

於本發明之一或多個實施方式中，第一發光層之材質為第一主體(Host)與摻雜發光材料，第二發光層之材質為 第二主體與摻雜發光材料，第三發光層之材質為第三主體與摻雜發光材料。 In one or more embodiments of the present invention, the material of the first light-emitting layer is the first host (Host) and the doped light-emitting material, and the material of the second light-emitting layer is The second body and the doped luminescent material, and the material of the third light-emitting layer are the third body and the doped luminescent material.

於本發明之一或多個實施方式中，第一能障之絕對值大於第一能階差之絕對值約0.1eV，第二能障之絕對值大於第二能階差之絕對值約0.1eV。 In one or more embodiments of the present invention, the absolute value of the first energy barrier is greater than the absolute value of the first energy level difference by about 0.1 eV, and the absolute value of the second energy barrier is greater than the absolute value of the second energy level difference by about 0.1 eV.

於本發明之一或多個實施方式中，第一發光層的最高占據分子軌域的能階小於第二發光層的最高占據分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the highest occupied molecular orbital region of the first light-emitting layer is smaller than the energy level of the highest occupied molecular orbital region of the second light-emitting layer.

於本發明之一或多個實施方式中，第一發光層的最低未占分子軌域的能階小於第二發光層的最低未占分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the lowest unoccupied molecular orbital region of the first light-emitting layer is smaller than the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer.

於本發明之一或多個實施方式中，下電極的最高占據分子軌域的能階大於第一有機層的最高占據分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the highest occupied molecular orbital region of the lower electrode is greater than that of the first organic layer.

於本發明之一或多個實施方式中，第一有機層的最高占據分子軌域的能階大於第一發光層的最高占據分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the highest occupied molecular orbital region of the first organic layer is greater than the energy level of the highest occupied molecular orbital region of the first light-emitting layer.

於本發明之一或多個實施方式中，第二發光層的最低未占分子軌域的能階大於第三發光層的最低未占分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer is greater than the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer.

於本發明之一或多個實施方式中，第三發光層的最低未占分子軌域的能階大於第二有機層的最低未占分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer is greater than the energy level of the lowest unoccupied molecular orbital region of the second organic layer.

於本發明之一或多個實施方式中，第二有機層的最低未占分子軌域的能階大於上電極的最低未占分子軌域的能階。 In one or more embodiments of the present invention, the energy level of the lowest unoccupied molecular orbital region of the second organic layer is greater than the energy level of the lowest unoccupied molecular orbital region of the upper electrode.

本發明上述實施方式藉由使第一發光層的最高占據分子軌域的能階與第二發光層的最高占據分子軌域的能階之間的能階差夠大而形成第一能障，因此自下電極與第一有機層傳輸而進入第一發光層的電洞將會因為無法通過第一能障而被阻擋於第一發光層與第二發光層的介面之間；藉由使第一發光層的最低未占分子軌域的能階與第二發光層的最低未占分子軌域的能階之間的能階差夠大而形成第二能障，因此自上電極、第二有機層與第三發光層傳輸而進入第二發光層的電子將會因為無法通過第二能障而被阻擋於第一發光層與第二發光層的介面之間。於是，電子與電洞將會在第一發光層與第二發光層的介面結合，因而提升有機發光二極體顯示裝置的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The above embodiment of the present invention forms the first energy barrier by making the energy level difference between the energy level of the highest occupancy molecular orbital region of the first light-emitting layer and the energy level of the highest occupancy molecular orbital region of the second light-emitting layer large enough, Therefore, the holes transmitted from the lower electrode and the first organic layer into the first light-emitting layer will be blocked between the interface of the first light-emitting layer and the second light-emitting layer because they cannot pass through the first energy barrier; The energy level difference between the energy level of the lowest unoccupied molecular orbital region of a light-emitting layer and the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer is large enough to form a second energy barrier. The electrons transmitted by the organic layer and the third light-emitting layer and entering the second light-emitting layer will be blocked between the interface of the first light-emitting layer and the second light-emitting layer because they cannot pass through the second energy barrier. Therefore, electrons and holes will be combined at the interface of the first light-emitting layer and the second light-emitting layer, thereby improving the luminous efficiency of the organic light-emitting diode display device, and because no additional electron blocking layer and hole blocking layer are required, Therefore, the manufacturing process can be simplified.

100:有機發光二極體顯示裝置 100: Organic light-emitting diode display device

110:基板 110: substrate

120:下電極 120: Lower electrode

121、131、141、142、151、152、162、172、182:能階 121, 131, 141, 142, 151, 152, 162, 172, 182: energy levels

130:第一有機層 130: The first organic layer

140:第一發光層 140: the first light-emitting layer

150:第二發光層 150: second light emitting layer

160:第三發光層 160: third light emitting layer

170:第二有機層 170: second organic layer

180:上電極 180: upper electrode

B1:第一能障 B1: The first energy barrier

B2:第二能障 B2: Second energy barrier

D1:第一能階差 D1: first energy level difference

D2:第二能階差 D2: Second energy level difference

D3:第三能階差 D3: Third energy level difference

D4:第四能階差 D4: Fourth energy level difference

第1圖繪示依照本發明一實施方式的有機發光二極體顯示裝置的剖面示意圖。 FIG. 1 is a schematic cross-sectional view of an organic light emitting diode display device according to an embodiment of the invention.

第2圖繪示第1圖的有機發光二極體顯示裝置的能階示意圖。 FIG. 2 is a schematic diagram of energy levels of the organic light emitting diode display device of FIG. 1.

以下將以圖式揭露本發明之複數個實施方式，為明確說明起見，許多實務上的細節將在以下敘述中一併說明。然而，應瞭解到，這些實務上的細節不應用以限制本發明。也就是說，在本發明部分實施方式中，這些實務上的細節是非必要的。此外，為簡化圖式起見，一些習知慣用的結構與元件在圖式中將以簡單示意的方式繪示之。 In the following, a plurality of embodiments of the present invention will be disclosed in the form of diagrams. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and elements will be shown in a simple schematic manner in the drawings.

第1圖繪示依照本發明一實施方式的有機發光二極體顯示裝置100的剖面示意圖。本發明不同實施方式提供一種有機發光二極體顯示裝置100。具體而言，有機發光二極體顯示裝置100可為傳統式有機發光二極體顯示裝置、倒置型有機發光二極體顯示裝置、穿透式有機發光二極體顯示裝置、上發光型有機發光二極體顯示裝置、下發光型有機發光二極體顯示裝置、串聯式有機發光二極體顯示裝置或可撓曲式有機發光二極體顯示裝置。 FIG. 1 is a schematic cross-sectional view of an organic light emitting diode display device 100 according to an embodiment of the invention. Various embodiments of the present invention provide an organic light emitting diode display device 100. Specifically, the organic light-emitting diode display device 100 may be a conventional organic light-emitting diode display device, an inverted organic light-emitting diode display device, a transmissive organic light-emitting diode display device, or an upper-emission organic light-emitting device Diode display device, bottom-emission type organic light-emitting diode display device, tandem organic light-emitting diode display device or flexible organic light-emitting diode display device.

如第1圖所繪示，有機發光二極體顯示裝置100包含基板110、下電極120、第一有機層130、第一發光層140、第二發光層150、第三發光層160、第二有機層170以及上電極180。下電極120設置於基板110上。第一有機層130設置於下電極120上。第一發光層140設置於第一有機層130上。第二發光層150設置於第一發光層140上。第三發光層160設置於第二發光層150上。第二有機層170設置於第三發光層160上。上電極180設置於第二有機層170上。 As shown in FIG. 1, the organic light emitting diode display device 100 includes a substrate 110, a lower electrode 120, a first organic layer 130, a first light emitting layer 140, a second light emitting layer 150, a third light emitting layer 160, a second The organic layer 170 and the upper electrode 180. The lower electrode 120 is disposed on the substrate 110. The first organic layer 130 is disposed on the lower electrode 120. The first light-emitting layer 140 is disposed on the first organic layer 130. The second light emitting layer 150 is disposed on the first light emitting layer 140. The third light emitting layer 160 is disposed on the second light emitting layer 150. The second organic layer 170 is disposed on the third light-emitting layer 160. The upper electrode 180 is disposed on the second organic layer 170.

第2圖繪示第1圖的有機發光二極體顯示裝置100的能階示意圖。如第2圖所繪示，第一有機層130的最高占據分子軌域(Highest Occupied Molecular Orbital，HOMO)的能階131與第一發光層140的最高占據分子軌域的能階141之間具有第一能階差D1，第一發光層140的最高占據分子軌域的能階141與第二發光層150的最高占據分子軌域的能階151之間具有第一能障B1，第一能障B1之絕對值大於第一能階差D1之絕對值。第一發光層140的最低未占分子軌域(Lowest Unoccupied Molecular Orbital，LUMO)的能階142與第二發光層150的最低未占分子軌域的能階152之間具有第二能障B2，第二有機層170的最低未占分子軌域的能階172與第三發光層160的最低未占分子軌域的能階162之間具有第二能階差D2，第二能障B2之絕對值大於第二能階差D2之絕對值。 FIG. 2 is a schematic energy level diagram of the organic light emitting diode display device 100 of FIG. 1. As shown in FIG. 2, the energy level 131 of the highest organic molecular orbital (HOMO) of the first organic layer 130 and the energy level 141 of the highest molecular orbital of the first light-emitting layer 140 have The first energy level difference D1, the first energy barrier 141 of the first light-emitting layer 140 and the energy level 151 of the second light-emitting layer 150 having the highest molecular orbital area have a first energy barrier B1, the first energy The absolute value of the barrier B1 is greater than the absolute value of the first energy level difference D1. There is a second energy barrier B2 between the energy level 142 of the lowest unoccupied molecular orbital (LUMO) of the first light-emitting layer 140 and the energy level 152 of the lowest unoccupied molecular orbital (LUMO) of the second light-emitting layer 150, There is a second energy level difference D2 between the energy level 172 of the lowest unoccupied molecular orbital region of the second organic layer 170 and the energy level 162 of the lowest unoccupied molecular orbital region of the third light-emitting layer 160, and the absolute value of the second energy barrier B2 The value is greater than the absolute value of the second energy level difference D2.

藉由使第一發光層140的最高占據分子軌域的能階141與第二發光層150的最高占據分子軌域的能階151之間的能階差夠大而形成第一能障B1，於是自下電極120與第一有機層130傳輸而進入第一發光層140的電洞將會因為無法通過第一能障B1而被阻擋於第一發光層140與第二發光層150的介面之間；藉由使第一發光層140的最低未占分子軌域的能階142與第二發光層150的最低未占分子軌域的能階152之間的能階差夠大而形成第二能障B2，於是自上電極180、第二有機層170與第三發光層160傳輸而進入 第二發光層150的電子將會因為無法通過第二能障B2而被阻擋於第一發光層140與第二發光層150的介面之間。於是，電子與電洞將會在第一發光層140與第二發光層150的介面結合，因而提升有機發光二極體顯示裝置100的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The first energy barrier B1 is formed by making the energy level difference between the energy level 141 of the highest light emitting layer 140 occupying the molecular orbital and the energy level 151 of the second light emitting layer 150 occupying the highest molecular orbital sufficiently large, Therefore, the holes transmitted from the lower electrode 120 and the first organic layer 130 into the first light-emitting layer 140 will be blocked by the interface between the first light-emitting layer 140 and the second light-emitting layer 150 because they cannot pass through the first energy barrier B1. By making the energy level difference between the energy level 142 of the lowest unoccupied molecular orbital of the first light-emitting layer 140 and the energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150 large enough to form the second Energy barrier B2, so it enters from the upper electrode 180, the second organic layer 170 and the third light emitting layer 160 The electrons of the second light-emitting layer 150 will be blocked between the interface of the first light-emitting layer 140 and the second light-emitting layer 150 because they cannot pass through the second energy barrier B2. Therefore, electrons and holes will be combined at the interface of the first light-emitting layer 140 and the second light-emitting layer 150, thereby improving the luminous efficiency of the organic light-emitting diode display device 100, and because no additional electron blocking layer and holes are required The barrier layer thus simplifies the manufacturing process.

進一步來說，因為有機發光二極體顯示裝置100包含第一發光層140、第二發光層150與第三發光層160，由於發光層具有多層結構的關係，所以電子電洞結合而形成激子後回到基態的發光區域範圍變大了，因此將可避免激子產生於發光層與傳輸層之間而損失的情況，於是得以提升發光效率。 Further, because the organic light-emitting diode display device 100 includes a first light-emitting layer 140, a second light-emitting layer 150, and a third light-emitting layer 160, since the light-emitting layer has a multilayer structure, electron holes combine to form excitons The range of the light-emitting region back to the ground state becomes larger, so that the loss of excitons generated between the light-emitting layer and the transmission layer can be avoided, so that the light-emitting efficiency can be improved.

另外，由於電子的傳輸速度較慢，因此設置第三發光層160於第二發光層150與第二有機層170之間，其中第三發光層160的最低未占分子軌域的能階162介於第二發光層150的最低未占分子軌域的能階152與第二有機層170的最低未占分子軌域的能階172之間。於是，原本電子需經歷第二發光層150的最低未占分子軌域的能階152與第二有機層170的最低未占分子軌域的能階172之間的第三能階差D3，再加入第三發光層160後，電子僅需經歷第二發光層150的最低未占分子軌域的能階152與第三發光層160的最低未占分子軌域的能階162之間的第四能階差D4與第三發光層160的最低未占分子軌域的能階162與第二有機層170的最低未占分子軌域的能階172之間的第二能階差 D2，因而使電子自第二有機層170傳輸至第二發光層150所需經歷的每個能階差之絕對值變小，因此電子將能更容易地自第二有機層170傳輸至第二發光層150。 In addition, due to the slower electron transmission speed, the third light-emitting layer 160 is disposed between the second light-emitting layer 150 and the second organic layer 170, wherein the energy level 162 of the lowest unoccupied molecular orbital region of the third light-emitting layer 160 is between Between the energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150 and the energy level 172 of the lowest unoccupied molecular orbital of the second organic layer 170. Therefore, the electrons need to undergo a third energy level difference D3 between the energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150 and the energy level 172 of the lowest unoccupied molecular orbital of the second organic layer 170, and then After the third light-emitting layer 160 is added, the electrons only need to go through the fourth between the energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150 and the energy level 162 of the lowest unoccupied molecular orbital of the third light-emitting layer 160 The second energy level difference between the energy level difference D4 and the energy level 162 of the lowest unoccupied molecular orbital of the third light-emitting layer 160 and the energy level 172 of the lowest unoccupied molecular orbital of the second organic layer 170 D2, so that the absolute value of each energy level difference required for electrons to travel from the second organic layer 170 to the second light-emitting layer 150 becomes smaller, so electrons can be more easily transported from the second organic layer 170 to the second光层150。 The light emitting layer 150.

具體而言，第一有機層130可作為電洞注入層或電洞傳輸層，或者第一有機層130之材質可為電洞注入層與電洞傳輸層的綜合材料。第二有機層170可作為電子注入層或電子傳輸層，或者第二有機層170之材質可為電子注入層與電子傳輸層的綜合材料。應了解到，以上所舉之第一有機層130與第二有機層170的具體實施方式僅為例示，並非用以限制本發明，本發明所屬技術領域中具有通常知識者，應視實際需要，彈性選擇第一有機層130與第二有機層170的具體實施方式。 Specifically, the first organic layer 130 may serve as a hole injection layer or a hole transport layer, or the material of the first organic layer 130 may be a combined material of the hole injection layer and the hole transport layer. The second organic layer 170 may serve as an electron injection layer or an electron transport layer, or the material of the second organic layer 170 may be a composite material of the electron injection layer and the electron transport layer. It should be understood that the specific embodiments of the first organic layer 130 and the second organic layer 170 mentioned above are only examples, and are not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs should consider actual needs. The specific implementation of the first organic layer 130 and the second organic layer 170 is elastically selected.

因為有機發光二極體顯示裝置100的第一發光層140、第二發光層150與第三發光層160皆為發光層，可以使用相同機台製作，且有機發光二極體顯示裝置100僅包含第一有機層130與第二有機層170這兩層結構需要使用另外機台製作，因此有機發光二極體顯示裝置100的製程將能簡化，進而降低製造成本。 Because the first light-emitting layer 140, the second light-emitting layer 150, and the third light-emitting layer 160 of the organic light-emitting diode display device 100 are all light-emitting layers, they can be manufactured using the same machine, and the organic light-emitting diode display device 100 only includes The two-layer structure of the first organic layer 130 and the second organic layer 170 needs to be manufactured by using another machine. Therefore, the manufacturing process of the organic light-emitting diode display device 100 will be simplified, thereby reducing the manufacturing cost.

具體而言，第一發光層140之材質為第一主體(Host)與摻雜發光材料，第二發光層150之材質為第二主體與摻雜發光材料，第三發光層160之材質為第三主體與摻雜發光材料。於是，由於第一發光層140、第二發光層150與第三發光層160的摻雜發光材料皆為相同，因此無論電子電洞結合而形成激子的位置在第一發光層140、第 二發光層150或第三發光層160，第一發光層140、第二發光層150或第三發光層160皆會發射相同顏色之光線，也就不會有色偏差的問題。 Specifically, the material of the first light-emitting layer 140 is the first host (host) and the doped light-emitting material, the material of the second light-emitting layer 150 is the second host and the doped light-emitting material, and the material of the third light-emitting layer 160 is the first Three main bodies and doped luminescent materials. Therefore, since the doped light-emitting materials of the first light-emitting layer 140, the second light-emitting layer 150, and the third light-emitting layer 160 are all the same, the position where excitons are formed regardless of the combination of electron holes is in the first light-emitting layer 140, the first The second light-emitting layer 150 or the third light-emitting layer 160, the first light-emitting layer 140, the second light-emitting layer 150 or the third light-emitting layer 160 all emit light of the same color, so there is no problem of color deviation.

具體而言，第一發光層140、第二發光層150與第三發光層160發射光線之顏色可為紅色、綠色或藍色。應了解到，以上所舉之第一發光層140、第二發光層150與第三發光層160的具體實施方式僅為例示，並非用以限制本發明，本發明所屬技術領域中具有通常知識者，應視實際需要，彈性選擇第一發光層140、第二發光層150與第三發光層160的具體實施方式。 Specifically, the colors of the light emitted by the first light-emitting layer 140, the second light-emitting layer 150, and the third light-emitting layer 160 may be red, green, or blue. It should be understood that the specific embodiments of the first light-emitting layer 140, the second light-emitting layer 150, and the third light-emitting layer 160 mentioned above are only examples, and are not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs According to actual needs, the specific implementations of the first light-emitting layer 140, the second light-emitting layer 150, and the third light-emitting layer 160 are elastically selected.

具體而言，第一能障B1之絕對值大於第一能階差D1之絕對值約0.1eV，第二能障B2之絕對值大於第二能階差D2之絕對值約0.1eV。應了解到，以上所舉之第一能障B1、第二能障B2、第一能階差D1與第二能階差D2的具體實施方式僅為例示，並非用以限制本發明，本發明所屬技術領域中具有通常知識者，應視實際需要，彈性選擇第一能障B1、第二能障B2、第一能階差D1與第二能階差D2的具體實施方式。 Specifically, the absolute value of the first energy barrier B1 is greater than the absolute value of the first energy level difference D1 by about 0.1 eV, and the absolute value of the second energy barrier B2 is greater than the absolute value of the second energy level difference D2 by about 0.1 eV. It should be understood that the specific implementations of the first energy barrier B1, the second energy barrier B2, the first energy level difference D1 and the second energy level difference D2 mentioned above are only examples, and are not intended to limit the present invention. Those with ordinary knowledge in the technical field can flexibly select specific implementations of the first energy barrier B1, the second energy barrier B2, the first energy level difference D1 and the second energy level difference D2 according to actual needs.

具體而言，第一發光層140的最高占據分子軌域的能階141小於第二發光層150的最高占據分子軌域的能階151。第一發光層140的最低未占分子軌域的能階142小於第二發光層150的最低未占分子軌域的能階152。下電極120的最高占據分子軌域的能階121大於第一有機層130的最高占據分子軌域的能階131。第一有機層130的最 高占據分子軌域的能階131大於第一發光層140的最高占據分子軌域的能階141。第二發光層150的最低未占分子軌域的能階152大於第三發光層160的最低未占分子軌域的能階162。第三發光層160的最低未占分子軌域的能階162大於第二有機層170的最低未占分子軌域的能階172。第二有機層170的最低未占分子軌域的能階172大於上電極180的最低未占分子軌域的能階182。應了解到，以上所舉之下電極120、第一有機層130、第一發光層140、第二發光層150、第三發光層160、第二有機層170與上電極180的具體實施方式僅為例示，並非用以限制本發明，本發明所屬技術領域中具有通常知識者，應視實際需要，彈性選擇下電極120、第一有機層130、第一發光層140、第二發光層150、第三發光層160、第二有機層170與上電極180的具體實施方式。 Specifically, the energy level 141 of the highest occupancy molecular orbital of the first light-emitting layer 140 is smaller than the energy level 151 of the second luminescent layer 150 that occupies the highest molecular orbital. The energy level 142 of the lowest unoccupied molecular orbital of the first light-emitting layer 140 is smaller than the energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150. The energy level 121 of the highest occupied molecular orbital region of the lower electrode 120 is greater than the energy level 131 of the highest occupied molecular orbital region of the first organic layer 130. The most of the first organic layer 130 The energy level 131 of the highly occupied molecular orbital is larger than the energy level 141 of the highest occupied molecular orbital of the first light-emitting layer 140. The energy level 152 of the lowest unoccupied molecular orbital of the second light-emitting layer 150 is greater than the energy level 162 of the lowest unoccupied molecular orbital of the third light-emitting layer 160. The energy level 162 of the lowest unoccupied molecular orbital of the third light-emitting layer 160 is greater than the energy level 172 of the lowest unoccupied molecular orbital of the second organic layer 170. The energy level 172 of the lowest unoccupied molecular orbital region of the second organic layer 170 is greater than the energy level 182 of the lowest unoccupied molecular orbital region of the upper electrode 180. It should be understood that the specific embodiments of the lower electrode 120, the first organic layer 130, the first light-emitting layer 140, the second light-emitting layer 150, the third light-emitting layer 160, the second organic layer 170, and the upper electrode 180 mentioned above are only For illustration, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs should flexibly select the lower electrode 120, the first organic layer 130, the first light-emitting layer 140, and the second light-emitting layer 150 according to actual needs. Specific embodiments of the third light emitting layer 160, the second organic layer 170 and the upper electrode 180.

本發明上述實施方式藉由使第一發光層140的最高占據分子軌域的能階141與第二發光層150的最高占據分子軌域的能階151之間的能階差夠大而形成第一能障B1，於是自下電極120與第一有機層130傳輸而進入第一發光層140的電洞將會因為無法通過第一能障B1而被阻擋於第一發光層140與第二發光層150的介面之間；藉由使第一發光層140的最低未占分子軌域的能階142與第二發光層150的最低未占分子軌域的能階152之間的能階差夠大而形成第二能障B2，於是自上電極180、第二有機層170與第三發光層160傳輸而進入第二發光層150的電子將會因為無 法通過第二能障B2而被阻擋於第一發光層140與第二發光層150的介面之間。於是，電子與電洞將會在第一發光層140與第二發光層150的介面結合，因而提升有機發光二極體顯示裝置100的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The above embodiment of the present invention is formed by making the energy level difference between the energy level 141 of the highest occupied molecular orbital of the first light emitting layer 140 and the energy level 151 of the highest occupied molecular orbital of the second light emitting layer 150 large enough An energy barrier B1, so the holes transmitted from the lower electrode 120 and the first organic layer 130 into the first light-emitting layer 140 will be blocked by the first light-emitting layer 140 and the second light emission because they cannot pass through the first energy barrier B1 Between the interfaces of the layer 150; by making the energy level difference between the lowest unoccupied molecular orbital level 142 of the first light-emitting layer 140 and the lowest unoccupied molecular orbital level 152 of the second light-emitting layer 150 sufficient Forming a second energy barrier B2, and the electrons transmitted from the upper electrode 180, the second organic layer 170, and the third light-emitting layer 160 and entering the second light-emitting layer 150 will be The method passes through the second energy barrier B2 and is blocked between the interface between the first light-emitting layer 140 and the second light-emitting layer 150. Therefore, electrons and holes will be combined at the interface of the first light-emitting layer 140 and the second light-emitting layer 150, thereby improving the luminous efficiency of the organic light-emitting diode display device 100, and because no additional electron blocking layer and holes are required The barrier layer thus simplifies the manufacturing process.

雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed as above in an embodiment, it is not intended to limit the present invention. Anyone who is familiar with this art can make various modifications and retouching without departing from the spirit and scope of the present invention, so the protection of the present invention The scope shall be as defined in the appended patent application scope.

100:有機發光二極體顯示裝置 100: Organic light-emitting diode display device

120:下電極 120: Lower electrode

130:第一有機層 130: The first organic layer

121、131、141、142、151、152、162、172、182:能階 121, 131, 141, 142, 151, 152, 162, 172, 182: energy levels

140:第一發光層 140: the first light-emitting layer

150:第二發光層 150: second light emitting layer

160:第三發光層 160: third light emitting layer

170:第二有機層 170: second organic layer

180:上電極 180: upper electrode

B1:第一能障 B1: The first energy barrier

B2:第二能障 B2: Second energy barrier

D1:第一能階差 D1: first energy level difference

D2:第二能階差 D2: Second energy level difference

D3:第三能階差 D3: Third energy level difference

D4:第四能階差 D4: Fourth energy level difference

Claims (10)

一種有機發光二極體顯示裝置，包含：一基板；一下電極，設置於該基板上；一不具一第一阻擋層的第一有機層，設置於該下電極上；一第一發光層，設置於該第一有機層上；一第二發光層，設置於該第一發光層上，其中該第一有機層的最高占據分子軌域(Highest Occupied Molecular Orbital，HOMO)的能階與該第一發光層的最高占據分子軌域的能階之間具有一第一能階差，該第一發光層的最高占據分子軌域的能階與該第二發光層的最高占據分子軌域的能階之間具有一第一能障，該第一發光層的最低未占分子軌域(Lowest Unoccupied Molecular Orbital，LUMO)的能階與該第二發光層的最低未占分子軌域的能階之間具有一第二能障，該第一能障之絕對值大於該第一能階差之絕對值；一第三發光層，設置於該第二發光層上；一不具一第二阻擋層的第二有機層，設置於該第三發光層上，其中該第二有機層的最低未占分子軌域的能階與該第三發光層的最低未占分子軌域的能階之間具有一第二能階差，該第二能障之絕對值大於該第二能階差之絕對值，該第三發光層的最低未占分子軌域的能階介於該第二發光層的最低未占分子軌域的能階與該第二有機層的最低未占分子軌域的能階之間；以及一上電極，設置於該第二有機層上。 An organic light-emitting diode display device includes: a substrate; a lower electrode disposed on the substrate; a first organic layer without a first barrier layer disposed on the lower electrode; a first light-emitting layer disposed On the first organic layer; a second light-emitting layer is disposed on the first light-emitting layer, wherein the energy level of the highest organic molecular orbital (HOMO) of the first organic layer and the first The energy level of the highest occupied molecular orbital of the light emitting layer has a first energy level difference, the energy level of the highest occupied molecular orbital of the first light emitting layer and the energy level of the highest occupied molecular orbital of the second light emitting layer There is a first energy barrier between the energy level of the lowest unoccupied molecular orbital (LUMO) of the first light-emitting layer and the energy level of the lowest unoccupied molecular orbital (LUMO) of the second light-emitting layer Has a second energy barrier, the absolute value of the first energy barrier is greater than the absolute value of the first energy level difference; a third light-emitting layer is disposed on the second light-emitting layer; a third without a second barrier layer Two organic layers are disposed on the third light-emitting layer, wherein the energy level of the lowest unoccupied molecular orbital of the second organic layer and the energy level of the lowest unoccupied molecular orbital of the third light-emitting layer have a first Second energy level difference, the absolute value of the second energy barrier is greater than the absolute value of the second energy level difference, the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer is between the lowest unoccupied level of the second light-emitting layer Between the energy level of the molecular orbital region and the energy level of the lowest unoccupied molecular orbital region of the second organic layer; and an upper electrode disposed on the second organic layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第一發光層之材質為一第一主體(Host)與一摻雜發光材料，該第二發光層之材質為一第二主體與該摻雜發光材料，該第三發光層之材質為一第三主體與該摻雜發光材料。 The organic light-emitting diode display device according to claim 1, wherein the material of the first light-emitting layer is a first host (Host) and a doped light-emitting material, and the material of the second light-emitting layer is a second body With the doped luminescent material, the material of the third luminescent layer is a third body and the doped luminescent material. 如請求項1所述之有機發光二極體顯示裝置，其中該第一能障之絕對值大於該第一能階差之絕對值約0.1eV，該第二能障之絕對值大於該第二能階差之絕對值約0.1eV。 The organic light-emitting diode display device according to claim 1, wherein the absolute value of the first energy barrier is greater than the absolute value of the first energy level difference by about 0.1 eV, and the absolute value of the second energy barrier is greater than the second The absolute value of the energy level difference is about 0.1 eV. 如請求項1所述之有機發光二極體顯示裝置，其中該第一發光層的最高占據分子軌域的能階小於該第二發光層的最高占據分子軌域的能階。 The organic light emitting diode display device according to claim 1, wherein the energy level of the highest occupied molecular orbital region of the first light emitting layer is smaller than the energy level of the highest occupied molecular orbital region of the second light emitting layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第一發光層的最低未占分子軌域的能階小於該第二發光層的最低未占分子軌域的能階。 The organic light emitting diode display device according to claim 1, wherein the energy level of the lowest unoccupied molecular orbital region of the first light emitting layer is smaller than the energy level of the lowest unoccupied molecular orbital region of the second light emitting layer. 如請求項1所述之有機發光二極體顯示裝置，其中該下電極的最高占據分子軌域的能階大於該第一有機層的最高占據分子軌域的能階。 The organic light emitting diode display device according to claim 1, wherein the energy level of the highest occupied molecular orbital of the lower electrode is greater than the energy level of the highest occupied molecular orbital of the first organic layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第一有機層的最高占據分子軌域的能階大於該第一發光層的最高占據分子軌域的能階。 The organic light emitting diode display device according to claim 1, wherein the energy level of the highest occupied molecular orbital region of the first organic layer is greater than the energy level of the highest occupied molecular orbital region of the first light emitting layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第二發光層的最低未占分子軌域的能階大於該第三發光層的最低未占分子軌域的能階。 The organic light-emitting diode display device according to claim 1, wherein the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer is greater than the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第三發光層的最低未占分子軌域的能階大於該第二有機層的最低未占分子軌域的能階。 The organic light-emitting diode display device according to claim 1, wherein the energy level of the lowest unoccupied molecular orbital region of the third light-emitting layer is greater than the energy level of the lowest unoccupied molecular orbital region of the second organic layer. 如請求項1所述之有機發光二極體顯示裝置，其中該第二有機層的最低未占分子軌域的能階大於該上電極的最低未占分子軌域的能階。 The organic light emitting diode display device according to claim 1, wherein the energy level of the lowest unoccupied molecular orbital region of the second organic layer is greater than the energy level of the lowest unoccupied molecular orbital region of the upper electrode.
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