I288573§7twfid〇c/c 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種電激發光元件，且特別是有關於 一種白光有機電激發光元件。 【先前技術】 針對顯示技術之快速發展，具有自發光（Emissive)、 無視角限制、低製造成本、高應答速度（約為液晶顯示器 的百倍以上）、省電、工作溫度範圍大、重量輕以及可隨 硬體設備小型化及薄型化等優越特性之有機電激發光顯示 器（Organic Electroluminescent Display)，可望成為新世 代的平面顯示器。 有機電激發光顯示器可依照有機官能性材料的分子量 不同分為小分子有機電激發光顯示器（small m〇lecule 〇LE：D，SM-OLED)與高分子有機電激發光顯示器（⑽^黯 light-emitting display，PLED)兩大類。就有機電激發光顯 示器的全彩技術而言，目前可區分為三種：第一種^藉由 紅光、藍光以及綠光三原色發光之有機電激發光元件；第 二種係以藍光有機電激發光元件搭配色變換層，以分別發 出紅光、藍光以及綠光，第三種則係以白光有機電激發光 元件搭配彩色濾光片，以分別發出紅光、藍光以及綠^。 其中，白光有機電激發光元件除了可以應用在上述之全彩 顯示器外，亦可以廣泛地使用在照明裝置上，因此提高^ 光有機電激發光元件的效率為目前開發的重點之一。门 圖1繪示為習知一種白光有機電激發光元件的剖面示 12885¾ 7twf.doc/c 意圖。請參照圖1，白光有機電激發光元件100係由陽極 102、陰極104以及配置於陽極1〇2與陰極1〇4之間的有 機官能層（organic functional iayer) 110 所構成。其中， 配置在陽極102上的有機官能層11〇係依序由藍光發光層 (電洞傳輸層）112、電洞阻擋層（h〇le bl〇cking layer， HBL) 114、紅光發光層（電子傳輸層）116以及綠光發 光層（電子傳輸層）118所構成。 二請繼續參照圖1，白光有機電激發光元件100係藉由 凋整電洞阻擔層114的厚度控制通過電洞阻撞層114的電 洞數量，以使部分之電子電洞對分別在藍光發光層（電洞 傳輸層）112、紅光發光層（電子傳輸層）116與綠光發 光層（電子傳輸層）118中再結合，以使有機官能層11〇 同時發出藍光、紅光及綠光，進而混成白光。 立圖2繪不為習知另一種白光有機電激發光元件200的 剖面示意圖。請參照圖2，配置在陽極1〇2與陰極1〇4之 間的有機官能層210係由電洞傳輸層212以及電子傳輸層 214、電子傳輸層216以及電子傳輸層218所構立^ =傳輪層2M、216、218分別為藍光、紅光以及綠紐 曰口此，¥電子電洞對在電子傳輸層214、216、218 j結合時，即可使有機官能層21()同時發出藍光、紅光 及、、亲光，進而混成白光。 命#的白光有魏激發光元件需要料地控制 :均Z對的結合位置以及每一種色光的比例，才能夠得 习的白光。因此，若工作電壓或膜層厚度控制不當， 12885¾ 7twf.doc/c 均會使得習知的白光有機電激發光元件無法發出 光’且元件穩定性較差。 【發明内容】 、…有鑑於此’本發明的目的係提供—種白光有機電激發 光兀件，其具有良好之元件穩定性，並且能约發出均勾白 光。 —本發明提供一種白光有機電激發光元件，依序包含一 第一電極、一載子傳輸層、一有機發光層以及一第二電極。 有機發光層包含一主（h〇st))發光材料與至少一客。狀^) ，光材料，當客發光材料吸收主發光材料所放出之部分能 里後，主發光材料係發出第一色光，客發光材料係發出第 二色光，且第一色光與第二色光互為互補色光。 本發明提供另一種白光有機電激發光元件，依序包含 一第一電極、一有機發光層以及一第二電極。有機發光層 包含一主發光材料與至少一客發光材料，當客發光材料吸 收主發光材料所放出之部分能量後，主發光材料係發出第 一色光，客發光材料係發出第二色光，且第一色光與第二 色光互為互補色光。 上述白光有機電激發光元件更包含一緩衝層，設置於 有機發光層與第二電極之間，其中緩衝層例如係一電洞阻 擔層。 在本發明的較佳實施例中，主發光材料所發出的第一 色光之波長例如係小於客發光材料所發出的第二色光之波 長。 7 12885邳 7twf.doc/c 在本發明的較佳實施例中，主發光材料例如係藍光發 光材料，且客發光材料例如係紅光發光材料，第一色光例 如係藍光，而第二色光例如係為紅光。 在本發明的較佳實施例中，主發光材料與客發光材料 可為咼分子發光材料（light emitting polymers)或小分子 發光材料（small molecular materials)，亦可為磷光材料 (phosphorescent materials )或螢光材料（f]uorescent materials)。 在本發明的較佳實施例中，主發光材料在有機發光層 中所佔的比例例如係50%至1〇〇%之間。 本發明係以主發光材料摻雜客發光材料作為白光有機 電激發光元件的有機發光層，並將主發光材料與客發光材 料的比例依據貫際需要加以調整，以經由能量移轉的機制 而使主發光材料與客發光材料分別發出互補的色光，進而 混成均勻白光。因此，本發明之白光有機電激發光元件所 發出的光線色度不會受到外加電壓與有機發光層之厚度的 影響，具有良好的元件穩定性。 “為讓本發明之上述和其他目的、特徵和優點能更明顯 易K，下域舉較佳實施例，並配合所關式，作詳細說 明如下。 【實施方式】. 本發明之白光有機電激發光元件係於有機發光層中換 雜主發光材料及客發光材料，以藉由調整此兩種材料的比 例而得到均勻的白光。以下將舉實施例說明本發明，但其 12885^7twf.doc/c 並非用以限定本發明’熟習此技藝者可依照本發明之精神 對下述實施砸轉#，惟其制於本發0狀顧。 ，3 ^為本發明之—較佳實施财白光有機電激發 面1忍圖。請參照圖3 ’白光有機電激發光元 件300包含-苐—電極3〇2、一載子傳輸層撕、一有機 發光層306以及—第二電極遍依序設置於一基板(圖未 示)上。本實施例之第一電極搬例如是陽極，第二電極 例^是陰極而载子傳輸層3〇4例如是電洞傳輸層； ’、他貝把例中’第—電極3〇2可以是陰極’第二電極細 為陽極，而載子傳輸層删則為電子傳輸層。 口时热白此技藝者應知，白光有機電激發光元件 300可以 =早向或雙向出光，因此熟習此技藝者可以自行依照實際 ==定白光有機電激發光元件的出Μ向，並依此 =第-電極302及/或第二電極遞是否為透明電極或 ¥電材質構成之電極，本發明並不對其減限^。其中， ，以，為透明電極的材質可為導電之金屬氧化物，例如係 =锡氧化物（ιτο)、銦鋅氧化物（ΙΖ〇)、轉氧化物 =0)、鎘錫氧化物或係其他導電之金屬氧化物；導電 2係選自1呂n、銦、錫、猛、銅、銀、金及其合金 f少其中之―，含鎂之合金係為鎂銀合金、鎂銦合金、鎂 、合金、鎂銻合金或鎂碲合金。 、 ，發明一較佳實施例中，第一電極302與第二電極308 之材貝與作為陰陽極之應用，可依據實際需求加以互換。 I288573§87twf-doc/c 凊繼續參照圖3，有機發光層306例如係由主發光材 料Η與客發光材料g所構成。其中，主發光材料η在有 機發光層306中所佔的比例例如係介於5〇%至1〇〇%之 間。在本發明之實施例中，其可以在有機發光層3〇6中摻 雜一或多客發光材料G，本發明不限定所摻雜之客發光材 料G的種類、數量與發光機制。 圖4Α繪示為主發光材料及客發光材料的光譜示意 圖。請參照圖4Α,曲線He為主發光材料Η的放射光譜， 曲線Ge為客發光材料G的放射光譜，而曲線Ga則係客 發光材料G的吸收光譜》請同時參照圖3及圖4A，由於 主發光材料Η的放射光譜He與客發光材料G的吸收光 譜Ga有部分重合（如圖4A所示），因此當載子（例如 2=3_電極逝經由載子傳輸層3G4而在有機發 先曰06中與另一電性之載子（例如係電子）再結合 f發光材料G能夠吸收由主發光材料H所放出的^分能 里。而且’當客發光㈣G吸收由主發储料Η所放 的部分能量後，主發光材料Η將 斤 發光材料G將發出一第二色光。其中，以:客 出色光互為互補色光，第一色光係與第二色 ”丨Α你个赞切的較佳實施 光波長較_發光材料作為样光 ^如係以色 長例如係小於第二色光的波長:二=-色光的波 本只才匕例為例，主發光 12885¾ 7twf.doc/c 材料H例如是藍光發光材料，例如係可為聚第樹脂 (polyfluorene) (Dow BP79) ^ polyspirofluorene (Covi〇n)" 聚對位苯基烯(p〇ly(para-phenylene))或其他藍光發光材料， 而客發光材料G例如是紅光發光材料，例如係可為聚苐 樹脂（polyfluorene) ( Dow Red-F )、p〇lyspiroflu〇rene (Covion)或其他紅光發光材料。因此，當客發光材料g 吸收由主發光材料Η所放出的部分能量後，主發光材料 Η係發出藍光，客發光材料G則係發出紅光，此兩種色 光將混成白光而射出。本發明較佳實施例中，白光有機電 激發光元件300所射出的白光在αΕ ( commissi〇n Internationale del’Eochdairage)色度座標上，其 χ 座標例如 疋介於0.33至0.30之間’而y座標例如係介於至0.34 之間。 圖4B繪示為主發光材料及客發光材料的另一光譜示 意圖。請參照圖4B，曲線He為主發光材料η的放射光 譜，曲線Ge為客發光材料G的放射光譜，而曲線Ga則 係客發光材料G的吸收光譜。 主發光材料Η例如是藍光發光材料，例如係可為聚 苐樹脂（polyfluorene) ( Dow ΒΡ79 )、polyspirofluorene (Covion)、聚對位苯基烯(p〇ly(para-phenylene))或其他藍光 發光材料，而客發光材料G例如是橘紅光發光材料，例 如係可為聚苐樹脂（polyfluorene) ( Dow NRP-5 )、 polyspirofluorene (Covion)或其他橘紅光發光材料。因此， 11 I2885m7twf.doc/c 田客么光材料G吸收由主發光材料η所放出的部分能量 後’主發光材料Η係發出藍光，客發光材料G則係發出 橘紅光，此兩種色光將混成白光而射出。本發明較佳^施 例中，白光有機電激發光元件300所射出的白光在匸正 色度座心上，其X座標例如是介於至〇·如之間，而 y座標例如係介於0.32至0.34之間。 々請繼續參照圖5，本發明的另一較佳實施例中，更可 在第二電極308與有機發光層306之間設置一緩衝層 籲 31〇，以避免有機發光層306與第二電極3〇8直接接觸: 其中緩衝層310較佳的是-電洞阻擋層，以便於阻擋電洞 從有機發光層306中往第二電極308流動，進而增加有機 發光層306中電子電洞對的結合機率，以提高發光效率。 、綜上所述，本發明係以主發光材料摻雜客發光材料作 為白光有機電激發光元件的有機發光層，並將主發光材料 與客發光材料的比例依據實際需要加以調整，以經由能量 移轉的機制而使主發光材料與客發光材料分別發出互補的 馨 色光，而混成均勻白光。因此，本發明之白光有機電激發 光元件所發出的光線色度不會受到外加電壓的影響。由於 本發明僅在白光有機電激發光元件設置一有機發光層，因 此有機發光層的厚度亦不會影響其所發出的光線色度。總 言之，本發明之白光有機電激發光元件不但可發出均勻白 光，亦可具有良好的元件穩定性，因此可廣泛地應用在照 明裝置或顯示裝置中’以提高裝置的發光效能。 12 I288571_c 、，然本發明已以較佳實施例揭露如上，然其並非用 以限=本發日@ ’任何熟習此技藝者，在不脫縣發明之精 範圍内’當可作些許之更動與潤飾，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。 【圖式簡單說明】 圖1缘示為習知-種白光有機電激發光元件的剖 意圖。 不 一立圖2繪不為習知另一種白光有機電激發光元件的剖面 教發 圖3繪示為本發明之一較佳實施例中白光有機電 光元件的剖面示意圖。 圖4A繪示為主發光材料以及客發光材料的光譜厂立 一圖4B繪示為主發光材料以及客發光材料的另〜 不意圖。 死谱 較佳實施例中白光有機 電激 圖5緣示為本發明之另一 發光元件的剖面示意圖。 【主要元件符號說明】 100、200、300:白光有機電激發光元件 忉2 :陽極 1〇4 =陰極 110、210 :有機官能層 112 :藍光發光層 114 ·電洞阻擋層 13 12885¾ twf.doc/c 116 :紅光發光層 118 :綠光發光層 212 :電洞傳輸層 214、216、218 :電子傳輸層 302 :第一電極 304 :載子傳輸層 306 :有機發光層 308 ··第二電極 310 :電洞阻擋層 G :客發光材料I288573 § 7 twfid 〇 c/c IX. Description of the Invention: [Technical Field] The present invention relates to an electroluminescent device, and more particularly to a white organic electroluminescent device. [Prior Art] For the rapid development of display technology, it has self-luminous (Emissive), no viewing angle limitation, low manufacturing cost, high response speed (about 100 times of liquid crystal display), power saving, large operating temperature range, light weight, and An organic electroluminescent display that can be used for miniaturization and thinning of hardware devices is expected to be a new generation of flat panel displays. Organic electroluminescent display can be divided into small molecule organic electroluminescent display (small m〇lecule 〇LE:D, SM-OLED) and polymer organic electroluminescent display according to the molecular weight of organic functional materials ((10)^黯light -emitting display, PLED) two categories. In the case of full-color technology with electromechanical excitation light displays, it can be divided into three types: the first one is an organic electroluminescent element that emits light by three primary colors of red, blue and green; the second is excited by blue organic electricity. The optical component is matched with a color conversion layer to emit red, blue, and green light, and the third is a white organic electroluminescent element combined with a color filter to emit red, blue, and green, respectively. Among them, the white organic electroluminescent device can be widely used in illumination devices in addition to the above-mentioned full-color display. Therefore, improving the efficiency of the organic electroluminescent device is one of the current development priorities. Figure 1 is a cross-sectional view of a conventional white organic electroluminescent device showing the meaning of 128, 853, 7 twf.doc/c. Referring to Fig. 1, a white organic electroluminescent device 100 is composed of an anode 102, a cathode 104, and an organic functional iayer 110 disposed between an anode 1〇2 and a cathode 1〇4. The organic functional layer 11 disposed on the anode 102 is sequentially composed of a blue light emitting layer (hole transport layer) 112, a hole blocking layer (HBL) 114, and a red light emitting layer. The electron transport layer 116 and the green light emitting layer (electron transport layer) 118 are formed. 2, with reference to FIG. 1, the white organic electroluminescent device 100 controls the number of holes passing through the hole blocking layer 114 by the thickness of the blocking hole 114, so that some of the electron hole pairs are respectively The blue light emitting layer (hole transport layer) 112, the red light emitting layer (electron transport layer) 116 and the green light emitting layer (electron transport layer) 118 are recombined to cause the organic functional layer 11 to emit blue light and red light simultaneously. Green light, and then mixed into white light. Figure 2 depicts a cross-sectional view of another conventional white organic electroluminescent device 200. Referring to FIG. 2, the organic functional layer 210 disposed between the anode 1〇2 and the cathode 1〇4 is formed by the hole transport layer 212 and the electron transport layer 214, the electron transport layer 216, and the electron transport layer 218. The transfer layers 2M, 216, and 218 are blue, red, and green, respectively. When the electron hole pairs are combined in the electron transport layers 214, 216, and 218, the organic functional layer 21 can be simultaneously emitted. Blue light, red light, and light, and then mixed into white light. The white light of the life # has the excitation light element required to control the material: the combined position of the Z pairs and the proportion of each color light can be used to obtain white light. Therefore, if the operating voltage or the thickness of the film is not properly controlled, 128832⁄4 7twf.doc/c will cause the conventional white organic electroluminescent element to emit light and the element stability is poor. SUMMARY OF THE INVENTION The object of the present invention is to provide a white organic electroluminescent device which has good component stability and is capable of emitting a white light. The present invention provides a white organic electroluminescent device comprising a first electrode, a carrier transport layer, an organic light emitting layer and a second electrode. The organic light-emitting layer comprises a primary (h〇st) luminescent material and at least one guest. Shape ^), light material, when the guest luminescent material absorbs part of the energy emitted by the main luminescent material, the main luminescent material emits a first color light, the guest luminescent material emits a second color light, and the first color light and the second color The color lights are complementary colors. The present invention provides another white organic electroluminescent device comprising a first electrode, an organic light emitting layer and a second electrode in sequence. The organic light-emitting layer comprises a main light-emitting material and at least one guest light-emitting material. When the guest light-emitting material absorbs part of the energy emitted by the main light-emitting material, the main light-emitting material emits a first color light, and the guest light-emitting material emits a second color light, and The first color light and the second color light are mutually complementary color lights. The white organic electroluminescent device further includes a buffer layer disposed between the organic light emitting layer and the second electrode, wherein the buffer layer is, for example, a hole blocking layer. In a preferred embodiment of the invention, the wavelength of the first color light emitted by the primary luminescent material is, for example, less than the wavelength of the second color light emitted by the guest luminescent material. 7 12885邳7twf.doc/c In a preferred embodiment of the invention, the primary luminescent material is, for example, a blue luminescent material, and the guest luminescent material is, for example, a red luminescent material, the first color light being, for example, blue light, and the second color light For example, it is red light. In a preferred embodiment of the present invention, the main luminescent material and the guest luminescent material may be light emitting polymers or small molecular materials, or may be phosphorescent materials or fluorescent materials. Light material (f]uorescent materials). In a preferred embodiment of the invention, the proportion of the primary luminescent material in the organic luminescent layer is, for example, between 50% and 1%. The invention adopts a main luminescent material doped with a guest luminescent material as an organic luminescent layer of a white organic electroluminescent device, and the ratio of the main luminescent material to the guest luminescent material is adjusted according to a continuous need to pass through a mechanism of energy transfer. The main luminescent material and the guest luminescent material respectively emit complementary color lights, and then mixed into uniform white light. Therefore, the chromaticity of the light emitted by the white organic electroluminescent device of the present invention is not affected by the applied voltage and the thickness of the organic luminescent layer, and has good element stability. The above and other objects, features and advantages of the present invention will become more apparent and obvious, and the preferred embodiments of the present invention will be described in the following. The excitation light element is mixed with the main light-emitting material and the guest light-emitting material in the organic light-emitting layer to obtain uniform white light by adjusting the ratio of the two materials. The present invention will be described below by way of examples, but it is 12885^7twf. Doc/c is not intended to limit the present invention. Those skilled in the art can implement the following implementations in accordance with the spirit of the present invention, but they are manufactured in the present invention. The organic electro-excitation surface 1 is forbearing. Please refer to FIG. 3 'The white organic electro-optic element 300 includes -苐-electrode 3〇2, a carrier transport layer tear, an organic light-emitting layer 306, and a second electrode sequentially arranged. On a substrate (not shown), the first electrode of the embodiment is, for example, an anode, the second electrode is a cathode, and the carrier transport layer 3〇4 is, for example, a hole transport layer; The 'electrode 3 〇 2 can be the cathode 'second electric The finer is the anode, and the carrier transport layer is deleted as the electron transport layer. The hot white of the mouth should know that the white organic electroluminescent element 300 can emit light in the early or the second direction, so those skilled in the art can follow the actual practice. == Determinates the exit direction of the white organic electroluminescence element, and accordingly, whether the first electrode 302 and/or the second electrode are electrodes of a transparent electrode or an electric material, the invention does not reduce the limit. Wherein, the material of the transparent electrode may be a conductive metal oxide, for example, tin oxide (ITO), indium zinc oxide (ΙΖ〇), oxidized oxide = 0), cadmium tin oxide or Other conductive metal oxides; the conductive 2 series is selected from the group consisting of 1 lun, indium, tin, lanthanum, copper, silver, gold and alloys thereof, and the magnesium-containing alloy is magnesium-silver alloy, magnesium-indium alloy, Magnesium, alloy, magnesium bismuth alloy or magnesium bismuth alloy. In the preferred embodiment of the invention, the application of the first electrode 302 and the second electrode 308 and the anode and cathode can be interchanged according to actual needs. 87twf-doc/c 凊Continue to refer to Figure 3, organic light-emitting layer 306 is composed, for example, of a main luminescent material Η and a guest luminescent material g. The proportion of the main luminescent material η in the organic luminescent layer 306 is, for example, between 5% and 1%. In an embodiment, the organic light-emitting layer 3 〇 6 may be doped with one or more guest luminescent materials G. The invention does not limit the type, number and illuminating mechanism of the doped luminescent material G. FIG. Schematic diagram of the main luminescent material and the guest luminescent material. Referring to FIG. 4A, the curve He is the emission spectrum of the luminescent material Η, the curve Ge is the emission spectrum of the guest luminescent material G, and the curve Ga is the absorption spectrum of the guest luminescent material G. Referring to FIG. 3 and FIG. 4A simultaneously, since the emission spectrum He of the main luminescent material 有 partially overlaps with the absorption spectrum Ga of the guest luminescent material G (as shown in FIG. 4A ), when the carrier (for example, 2=3_electrode) The luminescent material G is recombined with the other electrically conductive carrier (for example, electrons) in the organic precursor 曰06 via the carrier transport layer 3G4, and is capable of absorbing the energy emitted by the primary luminescent material H. Moreover, when the guest emits (four) G absorbs part of the energy placed by the main discharge hopper, the main luminescent material Η luminescent material G will emit a second colored light. Among them, the: the excellent light of each other is complementary color light, the first color light system and the second color" 丨Α you are better than the preferred implementation of the light wavelength _ luminescent material as the sample light ^ if the color length is, for example, less than The wavelength of the second color light: the wave of the second color-color light is only an example. The main light is 128853⁄4 7twf.doc/c. The material H is, for example, a blue light emitting material, for example, a polyfluorene (Dow BP79). ^ polyspirofluorene (Covi〇n) " p- phenylene (para-phenylene) or other blue luminescent material, and the guest luminescent material G is, for example, a red luminescent material, for example, a poly fluorene resin (polyfluorene) (Dow Red-F), p〇lyspiroflu〇rene (Covion) or other red light-emitting materials. Therefore, when the guest light-emitting material g absorbs part of the energy released by the primary light-emitting material, the main light-emitting material The blue light is emitted, and the guest light-emitting material G emits red light, and the two color lights are mixed into white light to be emitted. In the preferred embodiment of the present invention, the white light emitted by the white organic light-emitting element 300 is at αΕ (commissi〇n Internationale del 'Eochdairage' on the chromaticity coordinates Its χ coordinates such as 疋 are between 0.33 and 0.30' and the y coordinate is, for example, between 0.34. Figure 4B shows another spectral schematic of the main luminescent material and the guest luminescent material. Please refer to Figure 4B, curve He The emission spectrum of the main luminescent material η, the curve Ge is the emission spectrum of the guest luminescent material G, and the curve Ga is the absorption spectrum of the guest luminescent material G. The main luminescent material Η is, for example, a blue luminescent material, for example, a polyfluorene resin (polyfluorene) (Dow ΒΡ 79 ), polyspirofluorene (Covion), poly(p-phenylene) or other blue luminescent material, and the guest luminescent material G is, for example, an orange-red luminescent material, for example, It is polyfluorene (Dow NRP-5 ), polyspirofluorene (Covion) or other orange-red light-emitting materials. Therefore, 11 I2885m7twf.doc/c is a part of the energy emitted by the main luminescent material η. After the 'primary luminescent material lanthanum emits blue light, the guest luminescent material G emits orange-red light, and the two colored lights will be mixed into white light to be emitted. In the preferred embodiment of the present invention, the white organic electroluminescent element 30 The white light emitted by 0 is at the center of the 色 chromaticity, and its X coordinate is, for example, between 〇·如, and the y coordinate is, for example, between 0.32 and 0.34. Continuing to refer to FIG. 5, in another preferred embodiment of the present invention, a buffer layer 31 is further disposed between the second electrode 308 and the organic light-emitting layer 306 to avoid the organic light-emitting layer 306 and the second electrode. 3〇8 direct contact: wherein the buffer layer 310 is preferably a hole blocking layer to facilitate blocking the flow of holes from the organic light-emitting layer 306 to the second electrode 308, thereby increasing the electron hole pair in the organic light-emitting layer 306. Combine the probability to improve luminous efficiency. In summary, the present invention uses a main luminescent material doped with a guest luminescent material as an organic luminescent layer of a white organic electroluminescent device, and the ratio of the main luminescent material to the guest luminescent material is adjusted according to actual needs to pass energy. The mechanism of the transfer causes the main luminescent material and the guest luminescent material to respectively emit complementary lusin light, and is mixed into uniform white light. Therefore, the chromaticity of light emitted by the white organic electroluminescent device of the present invention is not affected by the applied voltage. Since the present invention provides an organic light-emitting layer only in the white organic electroluminescent device, the thickness of the organic light-emitting layer does not affect the color of the light emitted therefrom. In summary, the white organic electroluminescent device of the present invention can not only emit uniform white light but also have good element stability, and thus can be widely applied to illumination devices or display devices to improve the luminous efficacy of the device. 12 I288571_c, however, the present invention has been disclosed in the preferred embodiment as above, but it is not intended to limit the number of people who are familiar with this technology, and may not make any changes in the scope of the invention. And the scope of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional white light organic electroluminescent device. FIG. 3 is a cross-sectional view showing a white organic electro-optical device according to a preferred embodiment of the present invention. FIG. 3 is a cross-sectional view showing another white organic electroluminescent device. Fig. 4A shows the spectrum of the main luminescent material and the guest luminescent material. Fig. 4B illustrates the main luminescent material and the guest luminescent material. Dead Spectrum Preferred Embodiments of White Light Organic Electro-Magnetism Figure 5 is a cross-sectional view showing another light-emitting element of the present invention. [Main component symbol description] 100, 200, 300: white organic electroluminescent element 忉2: anode 1〇4 = cathode 110, 210: organic functional layer 112: blue light emitting layer 114 · hole blocking layer 13 128853⁄4 twf.doc /c 116 : red light emitting layer 118 : green light emitting layer 212 : hole transport layer 214 , 216 , 218 : electron transport layer 302 : first electrode 304 : carrier transport layer 306 : organic light emitting layer 308 · · second Electrode 310: hole barrier layer G: guest luminescent material
Ga:客發光材料之吸收光譜Ga: absorption spectrum of guest luminescent materials
Ge :客發光材料之放射光譜 Η :主發光材料Ge : Radiation spectrum of guest luminescent materials Η : main luminescent material
He :主發光材料之放射光譜He : emission spectrum of the main luminescent material
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