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Stable white-light organic thin-film electroluminescent device with bipolar mixed spacer layers, and preparation method thereof

A technology for electroluminescent devices and organic thin films, which is applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve problems such as increased manufacturing costs, unfavorable industrial manufacturing and wide application, and complicated preparation processes, and achieves Convenient operation, easy control, uniform effect of luminous spectrum

Inactive Publication Date: 2018-08-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also brings some obstacles to commercialization, such as how to control the evaporation rate of the host material and guest material in the light-emitting layer to more precisely control the doping concentration, and it is necessary to find a high-energy bipolar host material to effectively limit Exciton
This makes the preparation process of the device more complicated, and the manufacturing cost is also increased a lot, which is not conducive to industrial manufacturing and wide application.

Method used

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  • Stable white-light organic thin-film electroluminescent device with bipolar mixed spacer layers, and preparation method thereof
  • Stable white-light organic thin-film electroluminescent device with bipolar mixed spacer layers, and preparation method thereof
  • Stable white-light organic thin-film electroluminescent device with bipolar mixed spacer layers, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, see figure 1 and figure 2 , a stable white light organic thin film electroluminescent device with a bipolar mixed spacer layer, comprising a substrate 10, an anode 20, a hole injection layer 30, a hole transport layer 40, an orange light ultrathin light emitting layer 50, The bipolar mixed spacer layer 60 on the front side, the green light ultra-thin light-emitting layer 70, the bipolar mixed spacer layer 60 on the back side, the blue light ultra-thin light-emitting layer 80, the electron transport layer 90, the electron injection layer 100 and the cathode 110; Wherein the hole transport layer 40 doubles as an electron blocking layer at the same time; the orange light ultra-thin light-emitting layer 50, the bipolar mixed spacer layer 60 on the front side, the green light ultra-thin light-emitting layer 70, and the bipolar mixed spacer layer 60 on the rear side and the blue light ultra-thin light-emitting layer 80 to form a layered and discontinuous li...

Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, especially in that:

[0039] In this embodiment, a method for preparing a stable white light organic thin film electroluminescent device with a bipolar mixed spacer layer comprises the following steps:

[0040] S1: This step is the same as the first embodiment;

[0041] S2: This step is the same as the first embodiment;

[0042] S3: Transfer the glass substrate sputtered with a layer of ITO conductive film with a thickness of 150nm to a pressure of 10 -4 In the high vacuum cavity under Pa, then on the anode 20 prepared in the step S2, by vacuum evaporation method, sequentially deposit and form a hole injection layer 30, a hole transport layer 40, an orange light ultra-thin light-emitting layer 50, The bipolar mixed spacer layer 60 on the front side, the green light ultra-thin light-emitting layer 70, the bipolar mixed spacer layer 60 on the back side, the blue light ultra-thin light-emitting layer 80, the electron...

Embodiment 3

[0046] This embodiment is basically the same as the previous embodiment, and the special features are:

[0047] In this embodiment, a method for preparing a stable white light organic thin film electroluminescent device with a bipolar mixed spacer layer comprises the following steps:

[0048] S1: This step is the same as the first embodiment;

[0049] S2: This step is the same as the first embodiment;

[0050] S3: Transfer the glass substrate sputtered with a layer of ITO conductive film with a thickness of 150nm to a pressure of 10 -4 In the high vacuum cavity under Pa, then on the anode 20 prepared in the step S2, by vacuum evaporation method, sequentially deposit and form a hole injection layer 30, a hole transport layer 40, an orange light ultra-thin light-emitting layer 50, The bipolar mixed spacer layer 60 on the front side, the green light ultra-thin light-emitting layer 70, the bipolar mixed spacer layer 60 on the back side, the blue light ultra-thin light-emitting l...

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Abstract

The invention discloses a stable white-light organic thin-film electroluminescent device with bipolar mixed spacer layers, and a preparation method thereof. The stable white-light organic thin-film electroluminescent device comprises a substrate, an anode, a hole injection layer, a hole transport layer, an orange-light ultrathin light emitting layer, a bipolar mixed spacer layer, a green-light ultrathin light emitting layer, a bipolar mixed spacer layer, a blue-light ultrathin light emitting layer, an electron transmission layer, an electron injection layer and a cathode which are sequentiallystacked. The stable white-light organic thin-film electroluminescent device does not use a doped illuminating system, avoids the problems that the doping concentration is difficult to control and doping is repeatedly performed, simplifies the process flow, saves materials, and reduces cost. According to the preparation method, the luminescent materials of different colors are prepared into different regions of the same bipolar mixed spacer layer, and the problem of driving voltage increases caused by a multiple light emitting layer structure is solved. The energy transfer system in the stablewhite-light organic thin-film electroluminescent device is effectively constructed and controlled, and finally the multi-spectral white-light organic thin-film electroluminescent device with stable spectra is obtained.

Description

technical field [0001] The invention relates to an electroluminescence device and a preparation method thereof, in particular to a white light electroluminescence device and a preparation method thereof, which are applied in the technical field of thin film electroluminescence devices. Background technique [0002] White light-emitting organic light-emitting diodes, namely organic light-emitting diodes, OLEDs have broad prospects for solid-state lighting and full-color displays due to their light weight, high flexibility, high resolution, and wide viewing angles. Currently, almost all monochrome and white phosphorescent OLEDs are prepared by co-evaporation. Doping helps reduce quenching, resulting in high efficiency and low efficiency roll-off. However, it also brings some obstacles to commercialization, such as how to control the evaporation rate of the host material and guest material in the light-emitting layer to more precisely control the doping concentration, and it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K30/865H10K50/11H10K71/00
Inventor 曹进俞浩健代旭东姚方男
Owner SHANGHAI UNIV
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