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Organic electroluminescence device and organic electroluminescence device

A technology of electroluminescent devices and electroluminescent devices, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve problems such as easy to be lit at the same time, low grayscale color shift, etc., to improve display quality and reduce The effect of injecting potential barriers and solving the problem of color shift

Active Publication Date: 2020-05-08
YUNGU GUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, when the blue sub-pixel is turned on, although the voltage is mainly across the blue sub-pixel, due to the better conductivity of the common hole injection layer, part of the voltage will be applied to the green sub-pixel through the common hole injection layer. In the photo sub-pixel and / or the red sub-pixel, since the turn-on voltages of the red sub-pixel and the green sub-pixel are both lower than the turn-on voltage of the blue sub-pixel, the red sub-pixel and / or the green sub-pixel are easy to be turned on at the same time, that is, in In the case of low gray scale, the luminous brightness of red sub-pixels and / or green sub-pixels cannot strictly meet the requirements to achieve low-brightness display effect, and low gray scale color cast (reddish) phenomenon occurs

Method used

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  • Organic electroluminescence device and organic electroluminescence device
  • Organic electroluminescence device and organic electroluminescence device
  • Organic electroluminescence device and organic electroluminescence device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] An embodiment of the present invention provides an organic electroluminescent device, such as figure 2 As shown, it includes a first electrode layer 1 , a carrier functional layer 2 , a light emitting layer 3 and a second electrode layer 4 which are stacked. The first electrode layer 1 is an anode, and the second electrode layer 4 is a cathode; or the first electrode layer 1 is a cathode, and the second electrode layer 4 is an anode. In the following, the first electrode layer 1 is used as an anode, and the second electrode layer 4 is used as a cathode as an example for illustration. The carrier functional layer 2 has one or more layers and is disposed between the light emitting layer 3 and the first electrode layer 1 and / or between the light emitting layer 3 and the second electrode layer 4 .

[0042] In the prior art, the process of lighting an organic electroluminescent device is to apply a certain driving voltage to the first electrode layer 1 and the second elect...

Embodiment 2

[0060] An embodiment of the present invention provides an organic electroluminescent device, including several pixel units distributed in an array, such as image 3 As shown, each pixel unit includes a red light sub-pixel unit 5 , a green light sub-pixel unit 6 and a blue light sub-pixel unit 7 .

[0061] Each sub-pixel unit includes a stacked first electrode layer 1, a carrier functional layer 2, a light-emitting layer 3, and a second electrode layer 4, a red sub-pixel unit 5, a green sub-pixel unit 6, and a blue sub-pixel unit 7 The light emitting layers 3 in the figure are red light emitting layer, green light emitting layer and blue light emitting layer respectively.

[0062] At least one carrier functional layer 2 close to the blue light emitting layer in the blue light sub-pixel unit 7 is doped with materials in the blue light emitting layer.

[0063] For specific content, reference may be made to the description in Embodiment 1, and details are not repeated here.

[0...

Embodiment 3

[0070] The embodiment of the present invention provides a specific organic electroluminescence device, including several pixel units distributed in an array, and each pixel unit includes a red sub-pixel unit 5 , a green sub-pixel unit 6 and a blue sub-pixel unit 7 .

[0071] Each sub-pixel unit includes a first electrode layer 1 (anode), a carrier functional layer 2 (hole injection layer 21, a hole transport layer 22, an electron blocking layer 23), a light-emitting layer 3, a carrier Flow sub-pixel unit 5, green sub-pixel unit 6 and blue sub-pixel unit 7 The light-emitting layers 3 are respectively a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer.

[0072] Wherein, the blue light-emitting layer 3 includes a host material CBP and a guest material BCzVBI, and the electron blocking layer 23 in the blue sub-pixel unit 7 is doped with the host material CBP in the blue light-emitting layer, and the doping ratio is 25 wt%. The electron blocki...

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Abstract

The invention relates to the field of display technology, and discloses an organic electroluminescent device and an organic electroluminescent device. The organic electroluminescent device includes a stacked first electrode layer, a carrier functional layer, a light emitting layer and a second electrode layer. In the electrode layer, at least one layer of the carrier functional layer close to the light emitting layer is doped with the material in the light emitting layer. The arrangement of the carrier functional layer helps to improve the mobility of the carriers, and the higher mobility of the carriers can effectively reduce the turn-on voltage of the device and improve the power efficiency of the device. Doping materials in the light-emitting layer in at least one carrier functional layer close to the light-emitting layer, thereby effectively improving the matching degree between the energy level of the light-emitting layer and the energy level of the carrier functional layer close to it, The energy level difference between the two is reduced, and the carrier injection potential barrier is reduced, thereby effectively reducing the turn-on voltage of the organic electroluminescent device.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic electroluminescence device and an organic electroluminescence device. Background technique [0002] Organic electroluminescent display (English full name Organic Light Emitting Display, referred to as OLED) is an active light-emitting display device. Due to its advantages such as simple manufacturing process, low cost, high contrast, wide viewing angle, and low power consumption, it is expected to become the next generation of mainstream flat panel. Display technology is one of the most concerned technologies in flat panel display technology. [0003] figure 1 The voltage-brightness curves of the RGB three-color sub-pixels in the existing display device are shown. It can be seen from the figure that in the existing OLED display device, the turn-on voltages of the RGB three-color sub-pixels are inconsistent. Specifically, the turn-on voltage of the blue light sub-pi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50
CPCH10K50/18H10K50/11H10K2101/10
Inventor 李维维何麟李梦真田景文李田田
Owner YUNGU GUAN TECH CO LTD
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