CN106848026A - Micro- LED component and display device - Google Patents

Abstract

The invention provides a kind of micro- LED component, including outgoing electrode, opposite electrode and light emitting functional layer, the outgoing electrode and the opposite electrode are oppositely arranged, the light emitting functional layer is arranged between the outgoing electrode and the opposite electrode, the outgoing electrode is nano metal film layer, and the present invention also provides a kind of display device including above-mentioned micro- LED component.Micro- LED component that the present invention is provided, it is possible to increase the extraction efficiency of the micro- LED component of light.

Description

Micro LED device and display device

technical field

The invention belongs to the field of display technology, and in particular relates to a micro LED device and a display device.

Background technique

At present, micro-LED devices usually include a first electrode and a second electrode arranged opposite to each other and a light-emitting functional layer arranged between the first electrode and the second electrode, which can be excited to emit light when an electrical signal is applied to the first electrode and the second electrode. The functional layer emits light, and the light signal emitted by the light-emitting functional layer can be emitted from the first electrode, thereby realizing light emission.

However, it is found in the actual application of the existing micro LED devices that the light extraction efficiency of the micro LED devices is low.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a micro LED device and a display device, which can improve the light extraction efficiency of the micro LED device.

In order to solve one of the above-mentioned problems, the present invention provides a micro-LED device, comprising an emitting electrode, an opposite electrode and a light-emitting functional layer, the emitting electrode and the opposing electrode are arranged oppositely, and the light-emitting functional layer is arranged on the Between the outgoing electrode and the opposite electrode, the outgoing electrode is a nano-metal film layer.

Preferably, the nano-metal film layer is an aluminum film layer; the light-emitting functional layer is an ultraviolet light-emitting functional layer.

Preferably, the thickness of the aluminum film layer ranges from 3nm to 7nm.

Preferably, the thickness of the aluminum film layer ranges from 4.5 nm to 5.5 nm.

Preferably, the ultraviolet light emitted by the ultraviolet light-emitting functional layer has a wavelength range of 260 nm to 300 nm.

Preferably, the opposite electrode has the function of reflecting optical signals.

Preferably, a dielectric layer is provided on the luminescent functional layer; an opening is provided in the central area of the dielectric layer; the outgoing electrode is formed on the surface of the dielectric layer and the opening of the luminescent functional layer on the corresponding surface.

Preferably, a photoluminescent layer is further provided on the outgoing electrode, for the light emitted by the outgoing electrode to excite the photoluminescent layer to emit light of a desired color.

Preferably, the photoluminescent layer includes a quantum dot light emitting layer or a phosphor powder light emitting layer.

The present invention also provides a display device, including the micro LED device provided above in the present invention.

The present invention has the following beneficial effects:

In the present invention, the use of nano-metal thin film as the outgoing electrode can well realize the collection and re-emission of optical signals, thereby improving the extraction efficiency of optical micro-LED devices; and the transparency of the nano-metal thin film can meet the needs of the outgoing electrode as an outgoing requirements.

Description of drawings

FIG. 1 is a schematic structural diagram of a micro LED device provided in Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of a micro LED device provided by Embodiment 2 of the present invention.

Reference signs include: 1, outgoing electrode; 2, opposite electrode; 3, light-emitting functional layer; 4, dielectric layer; 5, photoluminescent layer; 6, dislocation.

detailed description

In order for those skilled in the art to better understand the technical solution of the present invention, the micro LED device and the display device provided by the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

Figure 1 is a schematic structural diagram of the micro-LED device provided in Example 1 of the present invention; please refer to Figure 1, the micro-LED device provided in Example 1 includes an outgoing electrode 1, an opposite electrode 2 and a light-emitting functional layer 3, wherein the so-called The outgoing electrode 1 refers to an electrode that is used as an optical signal to exit; the outgoing electrode 1 and the opposite electrode 2 are arranged oppositely, and the light-emitting functional layer 3 is arranged between the outgoing electrode 1 and the opposite electrode 2. Specifically, the light-emitting functional layer 3 includes P-type A semiconductor layer, a P-N junction and an N-type semiconductor layer; the outgoing electrode 1 is a nanometer metal film layer.

In this embodiment, the nano-scale metal film is used as the exit electrode, which can well realize the collection and re-emission of optical signals, thereby improving the light extraction efficiency of the micro-LED device; and the transparency of the nano-scale metal film can meet the requirements of the exit electrode. As a requirement for exit.

Preferably, the nano-metal film layer is an aluminum film layer; the light-emitting functional layer 3 is an ultraviolet light-emitting functional layer, and the nano-scale aluminum film layer has a high light extraction efficiency for ultraviolet light, that is, it can well collect ultraviolet light , so the extraction efficiency of the micro LED device can be well improved.

Further preferably, the thickness of the aluminum film layer ranges from 3nm to 7nm, so as to realize light collection well.

More preferably, the thickness of the aluminum film layer ranges from 4.5nm to 5.5nm, so that part of the light can be prevented from being reflected to the opposite electrode 2, thereby further improving the light extraction efficiency of the micro LED device.

Also preferably, the ultraviolet light emitted by the ultraviolet light-emitting functional layer has a wavelength range of 260 nm to 300 nm, so that the aluminum film layer has a higher light extraction efficiency for the ultraviolet light within the wavelength range.

In addition, preferably, the opposite electrode 2 has the function of reflecting light signals, so that the light reflected by the output electrode 1 to the opposite electrode 2 is reflected to the output electrode 1 and then emitted, so as to ensure the light extraction efficiency.

In addition, in this embodiment, a photoluminescent layer 5 is further provided on the outgoing electrode 1 , which is used to make the light emitted by the outgoing electrode 1 excite the photoluminescent layer 5 to emit light of a desired color. For example, assume that the light-emitting functional layer 3 is an ultraviolet light-emitting functional layer, but in order to obtain light of other colors, the actual required color light can be obtained by setting a photoluminescent layer 5 of a corresponding color. Therefore, the application range of the micro-LED device can be improved by means of the photoluminescent layer 5, thereby improving the practicability of the micro-LED device.

Specifically, the photoluminescent layer 5 includes, but is not limited to: a quantum dot light emitting layer or a phosphor powder light emitting layer.

Example 2

FIG. 2 is a schematic structural diagram of a micro LED device provided by Embodiment 2 of the present invention. Please refer to Fig. 2. Compared with the micro-LED device provided by the above-mentioned embodiment 1, the micro-LED device provided by this embodiment 2 also includes an emitting electrode 1, an opposite electrode 2, a light-emitting functional layer 3 and a photoluminescent layer 5. The positional relationship and functions of the electrode 1 , the counter electrode 2 , the light-emitting functional layer 3 and the photoluminescent layer 5 have been described in detail in the above-mentioned embodiment 1, and will not be repeated here.

Only the points of difference between this embodiment and the above-mentioned Embodiment 1 will be described below. Specifically, in this embodiment, a dielectric layer 4 is provided on the luminescent functional layer 3; an opening is provided in the central area of the dielectric layer 4; the outgoing electrode 1 is formed on the surface of the dielectric layer 4 and the On the surface corresponding to the opening, as shown in Figure 2.

The reason why the dielectric layer 4 is set in this embodiment 2 is because: when the micro-LED array is divided into individual micro-LED devices, a large number of lattice defects are likely to be generated in the edge area during the scribing and etching process, resulting in The density of dislocation 6 at the edge is higher than that at the center, which will result in low light uniformity of multiple micro LED devices and poor stability of each micro LED device. The dielectric layer 4 can make each micro LED device emit light from the opening, thus improving the uniformity of light emission of multiple micro LED devices and the stability of each micro LED device.

Example 3

Embodiment 3 of the present invention provides a display device, including the micro LED device shown in Embodiment 1 or 2 of the present invention.

The display device provided by the embodiment of the present invention can improve the display effect of the display device because it adopts the micro LED device provided by the above-mentioned embodiment 1 or 2 of the present invention.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A micro-LED device, comprising an outgoing electrode, an opposite electrode and a light-emitting functional layer, the outgoing electrode and the opposite electrode are arranged oppositely, and the light-emitting functional layer is arranged on the outgoing electrode and the opposite electrode Between, it is characterized in that the outgoing electrode is a nano-metal film layer. 2. The micro-LED device according to claim 1, wherein the nano-metal film layer is an aluminum film layer; The luminescent functional layer is an ultraviolet luminescent functional layer. 3. The micro-LED device according to claim 2, wherein the thickness of the aluminum film layer ranges from 3nm to 7nm. 4. The micro-LED device according to claim 2, wherein the thickness of the aluminum film layer ranges from 4.5 nm to 5.5 nm. 5 . The micro-LED device according to claim 2 , wherein the ultraviolet light emitted by the ultraviolet light-emitting functional layer has a wavelength range of 260 nm to 300 nm. 6. The micro-LED device according to claim 1, wherein the opposite electrode has a function of reflecting light signals. 7. The micro-LED device according to claim 1, wherein a dielectric layer is arranged on the light-emitting functional layer; The central area of the dielectric layer is provided with an opening; The outgoing electrode is formed on the surface of the dielectric layer and the surface of the light emitting functional layer corresponding to the opening. 8. The micro LED device according to claim 1, characterized in that, a photoluminescent layer is also arranged on the outgoing electrode, and is used to excite the photoluminescent layer to emit the light emitted by the outgoing electrode. Light of desired color. 9. The micro LED device according to claim 8, wherein the photoluminescent layer comprises a quantum dot light emitting layer or a phosphor powder light emitting layer. 10. A display device, characterized by comprising the micro LED device according to any one of claims 1-9.