CN201213321Y - Organic Electroluminescent Light Source - Google Patents

Abstract

The utility model relates to an organic electroluminescent light source, which sequentially includes a substrate, an anode, an organic functional layer, a cathode and a packaging board, and is characterized in that it also includes several reflectors connected to each side of the substrate or the packaging board, wherein Each reflector forms a certain angle with one side of the corresponding light source, so that the light emitted from the side of the light source is reflected by the reflector and emitted from within the range of -45° to 45° from the horizontal direction where the light source is located. . The utility model can effectively use the light emitted from the side by using the reflection plate in the organic electroluminescent light source, increase the light output of the OLED light source, improve the brightness and luminous efficiency of the light source, and on the other hand, it can also reduce the emitted light of the OLED as an eye-protecting light source. The contrast with the ambient light reduces visual fatigue and forms a comfortable lighting environment.

Description

Organic Electroluminescent Light Source

technical field

The utility model relates to an organic electroluminescence device, in particular to an organic electroluminescence light source which increases light output rate and improves luminous efficiency.

Background technique

Incandescent lamps and fluorescent lamps are two commonly used traditional white light sources, but their utilization rate of energy is not high. The energy is used to emit light. Generally, the luminous efficiency of incandescent lamps is 13lm/W～20lm/W, and that of fluorescent tubes is 90lm/W. In order to save energy and improve energy utilization efficiency, the development of new white light sources has broad prospects.

Currently practical solid-state light sources, in addition to white LED lamps, organic light-emitting diode (OLED) technology has also made great progress in the past 20 years. With the gradual maturity of monochrome OLED performance, white OLED as a A new type of solid-state light source has a good application prospect in lighting and flat panel display backlight, and has attracted more and more attention. White light sources are usually emitted by mixing red, green and blue light. The reason for material selection is that the energy efficiency of the device is low, the driving voltage is high and the stability is poor. With the deepening of research and the further maturity of technology, the energy efficiency of OLED has been significantly improved, which has greatly exceeded that of incandescent light sources, and the use of Life expectancy has also increased significantly.

The OLED light source is not a point light source, but a distributed planar solid-state light source, which has the remarkable characteristics of ultra-thin, but the light emitted by the OLED is not only emitted uniformly from the direction perpendicular to the substrate, but also has a certain light output on the side of the substrate. The light emitted from the side is not used effectively, resulting in inefficiency and wasted energy.

Technical solutions

One purpose of this utility model is to provide an organic electroluminescent light source that can enhance brightness and improve light utilization; another purpose of this utility model is to provide an organic electroluminescent light source that reduces the contrast between the emitted light and the surrounding environment .

The above-mentioned purpose of the utility model is achieved through the following technical solutions:

An organic electroluminescent light source, which sequentially includes a substrate, an anode, an organic functional layer, a cathode, and a package plate, is characterized in that it also includes several reflectors connected to each side of the substrate or package plate, wherein each reflector It forms a certain angle with one side of the corresponding light source, so that the light emitted from the side of the light source is reflected by the reflector and emitted from a range of -45° to 45° horizontal to the light source.

In the above-mentioned organic electroluminescent light source, the reflection plate forms an angle of 22.5°-67.5° with one side of the corresponding light-emitting light source.

In the above-mentioned organic electroluminescent light source, the reflecting plate is composed of a reflecting part and a connecting part, wherein the included angle between the reflecting part and the connecting part is 22.5+90°-67.5+90°.

In the above-mentioned organic electroluminescent light source, one end of the connecting member is connected to one side of the corresponding packaging board.

In the above-mentioned organic electroluminescent light source, one end of the connection member is connected to one side of the corresponding substrate.

In the above-mentioned organic electroluminescence light source, the connecting part is connected to one side of the packaging board or the substrate through an adhesive.

In the above organic electroluminescent light source, the reflection plate is made of a thin material that can reflect light, or a thin stainless steel plate plus a reflection film.

When one end of each reflecting plate connecting part of the organic electroluminescent light source is connected to one side of the corresponding packaging plate, the light emitted from the side of the organic electroluminescent light source is reflected by the reflective plate, and the light is emitted from the light emitting direction of the organic electroluminescent light source. It emits within the range of 0°-45°, thereby effectively utilizing the light emitted from the side, increasing the light output of the OLED light source, and improving the brightness and luminous efficiency of the light source.

When one end of each reflecting plate connecting part of the organic electroluminescent light source is connected to one side of the corresponding substrate, the light emitted from the side of the organic electroluminescent light source is reflected by the reflective plate, and the direction of light output from the organic electroluminescent light source is in the same direction as that of the organic electroluminescent light source. —Emit within the range of 45°～0°. This technical scheme effectively uses the light emitted from the side of the light source to emit in the direction opposite to the light output direction of the light source, thereby improving the brightness of the surrounding environment and reducing the difference between the OLED emitted light and the surrounding environment light. Contrast, the lighting source made by this technical solution can reduce visual fatigue, form a comfortable lighting environment, help protect the eyes, and can be used as a light source for eye protection.

Description of drawings

Fig. 1 is a sectional view of the device structure of the first embodiment of the utility model

01 Substrate, 02 Anode, 03 Organic functional layer, 04 Cathode, 05 Packaging board, 06 Back cover, 07 Reflector

Figure 2 is a cross-sectional view of the device structure of the second embodiment of the utility model

01 Substrate, 02 Anode, 03 Organic functional layer, 04 Cathode, 05 Packaging board, 06 Back cover, 08 Reflector

Fig. 3 is a schematic diagram of the angle range between the reflector and the side of the OLED in the first embodiment of the utility model

01 Substrate, 02 Anode, 03 Organic functional layer, 04 Cathode, 05 Packaging board, 06 Back cover

Figure 4 is a schematic diagram of the angle range between the reflector and the side of the OLED in the second embodiment of the utility model

01 Substrate, 02 Anode, 03 Organic functional layer, 04 Cathode, 05 Packaging board, 06 Back cover

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Example 1

As shown in Figure 1, it is a cross-sectional view of the device structure of the first embodiment of the present utility model. On the transparent substrate 01, an anode 02, an organic functional layer 03, a cathode 04, a packaging plate 05 and a back cover 06 for protecting the device are arranged sequentially. Wherein the encapsulating plate 05 is connected with the reflecting plate 07, and the organic functional layer 03 includes at least one of a light emitting layer and a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer.

Concrete preparation process is as follows:

First, a layer of indium tin oxide (ITO) is sputtered on a cleaned transparent glass substrate to form a transparent electrode, and an auxiliary electrode layer, which can be metal Cr or Ag, is evaporated on the ITO film.

Then vapor-deposit the organic functional layer formed by multi-layer thin films. For example, the hole transport layer can be vapor-deposited first, and then the light-emitting layer can be vapor-deposited. Since the OLED light source requires a wide light-emitting spectrum and a high color rendering index, three light-emitting centers can be used. According to the device structure, the light emitted by three luminescent dyes of R, G, and B are selected respectively, and combined to obtain white light.

Continue to evaporate the electron transport layer and the metal cathode.

Afterwards, packaging is carried out, and the device prepared above is pressed together with the packaging board 05 to complete the packaging. The reflection board 07 is composed of two parts: a reflection part and a connecting part, wherein the packaging board 05 is connected to one end of the connection part of the reflection board 07, as As shown in Figure 1, the connecting parts of the reflective plate 07 can be glued and fixed together with the packaging plate 05 through an adhesive, and the material of the reflective part of the reflective plate 07 can be selected from any thin material capable of reflecting light, such as high reflectivity glass , It can also be a PET material or a thin stainless steel plate with a layer of reflective film on the surface. Afterwards, a back cover can be added behind the packaged device to protect the device.

The reflective plate 07 is located on the side of the OLED light source, and a reflective plate can be added on each side of the OLED light source. The angle between the reflective part and the connecting part of the reflective plate 07 is 22.5+90°～67.5+90°. The reflective part and the OLED light source The included angle of the side is in the range of 22.5°～67.5°, as shown in Figure 3, because we generally regard the light emitted from the side as parallel light, when the reflector 07 is installed within this angle range, the light emitted from the side The light can basically be limited to output downward within a range of 45° from the light emitting direction of the OLED light source, which is consistent with the light emitting direction of the OLED light source, so that all the light emitted by the OLED light source can be effectively used and converged into the visual range of people , increasing the light output of the OLED light source, improving the brightness and luminous efficiency of the light source.

Example 2

As shown in Fig. 2, it is a cross-sectional view of the device structure of the second embodiment of the present utility model. On the transparent substrate 01, an anode 02, an organic functional layer 03, a cathode 04, a package plate 05 and a back cover 06 for protecting the device are arranged sequentially. The encapsulation board 05 is connected to the substrate 01, and the organic functional layer 03 includes at least one of a light emitting layer and a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer.

The preparation process of the OLED light source in this embodiment is the same as that in Embodiment 1, the difference is that the reflective plate 07 is connected to the substrate 01, and the reflective plate 07 in this embodiment is also composed of two parts: a reflective part and a connecting part, wherein one end of the reflective part is connected to the substrate 01. One end of the surface of the corresponding substrate 01 is connected, as shown in Figure 3, the two can be fixed together by adhesive, and the area of the connection part between the connecting part and the substrate 01 is as small as possible to ensure that the light-emitting area will not be covered, affecting the The glow of the light source. Similarly, the material of the reflective part of the reflector 07 can be any thin material capable of reflecting light, such as high reflectivity glass, or PET material or a thin stainless steel plate with a reflective film on the surface.

The included angle between the reflective part and the connecting part of the reflector 07 is 22.5+90°～67.5+90°, and the included angle between the reflective part and the side of the OLED light source is in the range of 22.5°～67.5°, as shown in Figure 4, because we generally The light emitted from the side is approximately regarded as parallel light. When the reflector 07 is installed within this angle range, the light emitted from the side can basically be limited to output upward within the range of -45° from the light output direction of the OLED light source. The outgoing light direction of the OLED light source is opposite. In this embodiment, by connecting the reflector 07 to the substrate 01, the light emitted from the side of the OLED light source can be reflected and scattered into an environment opposite to the outgoing light of the OLED light source, thereby improving the surrounding environment. The brightness reduces the contrast between OLED emitted light and ambient light, and the lighting source made by adopting the technical solution of this embodiment can reduce visual fatigue, form a comfortable lighting environment, help protect eyes, and can be used as a kind of eye protection light source.

Claims (7)

1, a kind of electroluminescent light source, comprise substrate, anode, organic function layer, negative electrode and package board successively, it is characterized in that: also comprise several reflecting plates that are connected with described substrate or each limit of package board, wherein each reflecting plate is certain angle with corresponding side of illuminating source, make the light that sends from the illuminating source side after the reflection of described reflecting plate from being ejaculation in-45 °～45 ° the scope in the horizontal direction with illuminating source.

2, according to the electroluminescent light source of claim 1, it is characterized in that: described reflecting plate is 22.5 °～67.5 ° angle with a side of corresponding illuminating source.

3, according to the electroluminescent light source of claim 2, it is characterized in that: described reflecting plate is made up of reflection part and link two parts, wherein reflection part is 22.5 °～67.5 ° angle with a side of corresponding illuminating source, and the angle between reflection part and the link is 22.5+90 °～67.5+90 °.

4, according to the electroluminescent light source of claim 3, it is characterized in that: an end of described link connects with a limit of corresponding package board.

5, according to the electroluminescent light source of claim 3, it is characterized in that: an end of described link connects with a limit of corresponding substrate.

6, according to the electroluminescent light source of claim 4 or 5, it is characterized in that: described link is connected with a limit of described package board or substrate by binding agent.

7, according to the electroluminescent light source of the arbitrary claim of claim 1-5, it is characterized in that: described reflecting plate is by thin and can make by catoptrical material, or thin corrosion resistant plate surface adds one deck reflectance coating and forms.

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