CN204179113U - Organic electroluminescence device and display unit - Google Patents

Abstract

The utility model discloses an organic electroluminescent device and a display device. The organic electroluminescent device comprises a substrate, a light-transmitting anode formed on the substrate, an organic functional layer, and a light-transmitting cathode. The organic functional layer is located on the anode and the cathode. Between them, a reflective layer is arranged on the substrate, and the reflective surface of the reflective layer for reflecting light has an undulating structure that protrudes toward the organic functional layer and is recessed toward the substrate. The display device includes the organic electroluminescence device of the utility model. In the technical solution of the utility model, a reflective layer including an undulating structure protruding toward the organic functional layer and recessed toward the substrate is provided on the substrate, and different regions of the reflective surface of the reflective layer for reflecting light have different heights. This can alleviate the phenomenon of color shift at different angles caused by the microcavity effect.

Description

Organic electroluminescent device and display device

technical field

The utility model relates to the field of electroluminescence, in particular to an organic electroluminescence device and a display device.

Background technique

Organic electroluminescent display technology is currently recognized as a promising flat panel display technology in the world. It has many advantages: (1) The raw material is organic matter, and the material selection range is wide, and any color from blue light to red light can be realized. Display; (2) high luminous brightness, all solid-state active luminescence; (3) low driving voltage; (4) wide viewing angle, up to 160 degrees; (5) fast response speed, 1000 times that of liquid crystal display; (6) Ultra thin and light, low energy consumption.

Organic electroluminescent display (OLED) technology has recently been widely used in mobile communication terminals, personal digital assistants (PDAs), handheld computers, and the like. The core component of an organic electroluminescent display device is an organic electroluminescent device. Organic electroluminescence devices can be divided into bottom emission type and top emission type according to the way of light extraction.

1 is a cross-sectional view of a top-emission organic electroluminescent device, which mainly includes a light-transmitting cathode electrode layer 101, an organic functional layer 102, a light-transmitting anode electrode layer 103, a reflective layer 104, a protective layer 105, and a dielectric layer from top to bottom. Electrical layer 106 , insulating layer 107 , transistor 108 and substrate 100 . The transistor 108 is located between the dielectric layer 106 and the substrate 100 .

When the organic electroluminescence device of this structure works, the part of the luminescence of the organic functional layer 102 will be reflected by the light-transmitting cathode electrode layer 101, the light-emitting layer 102 itself and the light-transmitting anode electrode layer 103, and the light-transmitting cathode electrode layer 101 and A microcavity resonance effect will be generated between the light-transmitting anode electrode layers 103, which can make the light emitted by the organic functional layer 102 form constructive interference or destructive interference in the device, and enhance the light of a specific wavelength, so that due to different angles of light The strong difference thus makes the viewing angle of the device smaller. That is to say, when the organic electroluminescent device is viewed from different angles, the resonance effect of the microcavity will change the color of the light, that is, a color shift phenomenon will occur.

Utility model content

The purpose of the utility model is to provide an organic electroluminescent device and a display device.

The organic electroluminescent device of the present utility model comprises a substrate, a light-transmitting anode, an organic functional layer, and a light-transmitting cathode formed on the substrate, the organic functional layer is located between the anode and the cathode, A reflective layer is provided on the substrate, and the feature is that the reflective surface of the reflective layer for reflecting light has an undulating structure that protrudes toward the organic functional layer and is recessed toward the substrate.

In the organic electroluminescent device of the present invention, the relief structure includes a plurality of relief units, and the relief units include at least one protrusion protruding toward the organic functional layer.

In the organic electroluminescence device of the present utility model, wherein, the undulating unit includes two opposite sides extending toward the organic functional layer, and the two opposite sides are connected together to form a protrusion protruding toward the organic functional layer, One side of the protrusion and one side of the adjacent protrusion form a groove recessed toward the substrate.

In the organic electroluminescence device of the present invention, the distance H between the top of the protrusion and the bottom of the adjacent groove is between 1 nm-1 μm, and the width L of the bottom of the protrusion is between 0.1 μm-100 μm between.

In the organic electroluminescent device of the present invention, the longitudinal section of the protrusion along the width direction of the bottom and the longitudinal section of the groove along the width direction of the top are triangular, semi-elliptical or trapezoidal.

In the organic electroluminescence device of the present invention, the material of the reflective layer is silver, copper, aluminum, magnesium or metal alloy.

In the organic electroluminescence device of the present invention, a flat layer is arranged on the substrate, and the flat layer covers the reflective layer.

In the organic electroluminescence device of the present invention, the flat layer includes a first part located below the reflective layer and a second part located above the reflective layer, the first part and the second part the same or different materials.

The display device of the utility model includes the organic electroluminescence device of the utility model.

The technical scheme of the utility model aims at the color shift phenomenon of the top-emitting organic electroluminescent device caused by the microcavity effect, and a layer of reflective layer including an undulating structure protruding toward the organic functional layer and recessing toward the substrate is arranged on the substrate. The different areas of the reflective surface of the reflective layer used to reflect light have different heights, thereby causing the reflected light to have different optical path lengths, and the reflected light with different optical path lengths compensates with the upwardly emitted light from the organic functional layer, which can reduce the Color cast at different angles caused by the microcavity effect.

Description of drawings

FIG. 1 is a schematic structural view of an organic electroluminescent device in the prior art;

Fig. 2 is a schematic structural view of the organic electroluminescent device of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model.

As shown in Figure 2, the organic electroluminescent device of the present utility model comprises a substrate 2, a light-transmitting anode formed on the substrate 2, an organic functional layer 1 for emitting light, a light-transmitting cathode, and an organic functional layer 1 Located between the anode and the cathode, the substrate 2 is provided with a reflective layer 3 for reflecting light, the reflective layer 3 is arranged between the organic functional layer 1 and the substrate 2, and the reflective surface of the reflective layer 3 for reflecting light has an organic A relief structure in which the functional layer 1 protrudes and is recessed toward the substrate 2 .

When the organic electroluminescent device of the present utility model starts to work, the light is irradiated from the organic functional layer 1 to the reflective layer 3, because the reflective surface of the reflective layer 3 for reflecting light has an undulating structure protruding toward the organic functional layer 1, then The light reflected by the reflective layer has different optical path lengths, and the reflected light with different optical path lengths compensates with the light emitted upward by the organic functional layer, which can reduce the color shift phenomenon caused by the microcavity effect at different angles.

In the organic electroluminescent device of the present invention, the relief structure includes a plurality of relief units 10 , and the relief unit 10 includes at least one protrusion 20 protruding toward the organic functional layer 1 .

In the organic electroluminescence device of the present invention, the plurality of undulating units 10 can be arranged periodically or non-periodically, and the plurality of undulating units 10 can be of the same size or different in size.

The organic electroluminescent device of the utility model aims at the color shift phenomenon of the top-emitting organic electroluminescent device caused by the microcavity effect, and a layer of reflective structure including a relief structure protruding toward the organic functional layer and recessed toward the substrate is arranged on the substrate. The reflective layer has different heights in different areas of the reflective surface used to reflect light, thereby causing the reflected light to have different optical path lengths, and the reflected light with different optical path lengths compensates for the light emitted upwards by the organic functional layer , which can alleviate the color shift phenomenon at different angles caused by the microcavity effect.

In the organic electroluminescent device of the present invention, the undulating unit 10 includes two opposite sides 11 extending toward the organic functional layer 1, and the two opposite sides 11 are connected together to form a protrusion 20 protruding toward the organic functional layer 1, the protrusion 20 One side 11 and the adjacent protruding side form a groove 30 that is recessed toward the substrate 2 .

In the organic electroluminescent device of the present utility model, the first angle formed by the two opposite sides 11 of the undulating unit 10 protruding toward the organic functional layer 1 is an included angle, and one side 11 of the protrusion 20 forms an angle toward the substrate with one side of the adjacent protrusion. 1. The second angle of the depression is also an included angle, and the angles of the first angle and the second angle can be the same or different.

In the organic electroluminescent device of the present invention, the distance H between the top of the protrusion 20 and the bottom of the adjacent groove 30 is between 1 nm-1 μm, and the width L of the bottom of the protrusion 20 is between 0.1 μm-100 μm .

In the organic electroluminescence device of the present invention, the longitudinal section of the protrusion 20 along the width direction of the bottom and the longitudinal section of the groove 30 along the width direction of the top are triangular.

In other embodiments of the organic electroluminescent device of the present invention, the longitudinal section of the protrusion along the width direction of the bottom and the longitudinal section of the groove along the width direction of the top may be semi-elliptical or trapezoidal.

In the organic electroluminescent device of the present invention, the material of the reflective layer 3 is silver, copper, aluminum, magnesium or metal alloy.

In the organic electroluminescent device of the present invention, a flat layer 5 is arranged on the substrate 2 , and the flat layer 5 covers the reflective layer 3 .

In the organic electroluminescence device of the present invention, the flat layer 5 includes a first part 32 located below the reflective layer 3 and a second part 31 located above the reflective layer 3, and the materials of the first part 32 and the second part 31 are the same or not the same.

In the organic electroluminescence device of the present invention, the material used for the planar layer 5 can be SiO ₂ , SiN _x or resin materials.

The display device of the utility model includes the organic electroluminescence device of the utility model. The display device may be any product or component with a display function such as an OLED panel, a mobile phone, a tablet computer, a television set, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

The preparation method of the organic electroluminescence device of the present utility model comprises:

forming a first planar film layer on the substrate, and then using a template to emboss the first part of the planar layer with a pattern of high and low relief;

A reflective layer is formed on the first part of the planar layer, and the reflective surface of the reflective layer for reflecting light has an undulating structure protruding upward and recessed toward the substrate;

forming a second planar layer film layer on the reflective layer to form a second part of the planar layer;

A light-transmissive anode, an organic functional layer, and a light-transmissive cathode are formed on the second portion of the planar layer, and the organic functional layer is located between the anode and the cathode.

Compared with the traditional organic electroluminescent device, different regions of the reflective surface of the reflective layer of the organic electroluminescent device of the present invention for reflecting light have different heights, which can provide reflected light with different optical path lengths, so that It can compensate each other with the light emitted upward by the organic functional layer, thereby weakening the color shift phenomenon at different angles caused by the microcavity effect.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (9)

1. An organic electroluminescent device, comprising a substrate, a light-transmitting anode, an organic functional layer, and a light-transmitting cathode formed on the substrate, the organic functional layer being positioned between the anode and the cathode, A reflective layer is provided on the substrate, and the feature is that the reflective surface of the reflective layer for reflecting light has an undulating structure that protrudes toward the organic functional layer and is recessed toward the substrate. 2. The organic electroluminescent device according to claim 1, wherein the relief structure comprises a plurality of relief units, and the relief units comprise at least one protrusion protruding toward the organic functional layer. 3. The organic electroluminescence device according to claim 2, wherein the undulating unit comprises two opposite sides extending toward the organic functional layer, and the two opposite sides are connected together and form a A protrusion protruding from the organic functional layer, one side of the protrusion and one side of an adjacent protrusion form a groove recessed toward the substrate. 4. The organic electroluminescent device according to claim 3, wherein the distance H between the top of the protrusion and the bottom of the adjacent groove is between 1 nm-1 μm, and the width of the bottom of the protrusion is L is between 0.1 μm-100 μm. 5. The organic electroluminescent device according to claim 2, wherein the longitudinal section of the protrusion along the width direction of its bottom and the longitudinal section of the groove along the width direction of its top are triangular, semi-elliptical or trapezoidal. 6. The organic electroluminescence device according to claim 1, characterized in that, the material of the reflective layer is silver, copper, aluminum, magnesium or a metal alloy. 7. The organic electroluminescent device according to any one of claims 1-6, characterized in that a planar layer is provided on the substrate, and the planar layer covers the reflective layer. 8. The organic electroluminescence device according to claim 7, wherein the planar layer comprises a first portion below the reflective layer and a second portion above the reflective layer, the first portion The parts are the same or different from the material of the second part. 9. A display device, characterized by comprising the organic electroluminescence device according to any one of claims 1-8.