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A single-layer all-phosphorescent white light organic electroluminescent device and its preparation method

An electroluminescent device, white light technology, applied in organic light-emitting device, organic light-emitting device manufacturing/processing, electro-solid device and other directions, can solve the problems of high device brightness, low efficiency of all-fluorescent white light device, complicated manufacturing process, etc. Achieve the effect of reducing organic materials, good carrier transport characteristics, and stable luminescence spectrum

Active Publication Date: 2019-02-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past, in order to improve the efficiency of organic electroluminescent white light devices, most of the devices used all-fluorescent white light or fluorescent-phosphorescent mixed white light multilayer device structures, but the efficiency of all-fluorescent white light devices was extremely low, and this method was basically abandoned; while fluorescent-phosphorescent mixed white light Multilayer devices require a blue fluorescent material with a high triplet energy level and a red or orange phosphorescent material doped with a host to form white light. ideal method
[0005] At present, although some white light devices with exciplexes as the main body have been reported, they are limited to the mixed white light of fluorescence and phosphorescence. With the further development of research, the performance of white light devices needs to be further improved.

Method used

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  • A single-layer all-phosphorescent white light organic electroluminescent device and its preparation method
  • A single-layer all-phosphorescent white light organic electroluminescent device and its preparation method
  • A single-layer all-phosphorescent white light organic electroluminescent device and its preparation method

Examples

Experimental program
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Embodiment 1

[0029] Such as figure 1 As shown, the white light organic electroluminescent device W1 includes a substrate (not shown), an anode 100, a hole transport layer 110, a blocking layer 120, a light emitting layer 130, an electron transport layer 140 and an electron injection layer / cathode 150 stacked in sequence. , wherein the anode 100 is ITO glass, the hole transport layer 110 is 40nm thick TAPC, the barrier layer 120 is 5nm thick m-CBP, and the light emitting layer 130 is 30nm thick made of m-CBP, B4PyPPM, FIrpic, Ir(MDQ ) 2 The mixture that acac forms, wherein, FIrpic accounts for 8wt%, Ir(MDQ) 2 acac accounts for 0.15wt%, the electron transport layer 140 is B4PyPPM with a thickness of 40nm, the electron injection layer is LiF with a thickness of 1nm, and the cathode is Al with a thickness of 100nm. in,

[0030] The full name of TAPC is 1,1‐bis[4‐[N, N'‐di(p-tolyl)amino]phenyl]cyclohexane,

[0031] The full name of m‐CBP is 3,3'‐bis(9H‐carbazol‐9‐yl)biphenyl,

[0032] The ...

Embodiment 2

[0047] The light-emitting layer 130 is a 30nm-thick mixture composed of m-CBP, B4PyPPM, F3Irpic, and Ir(MDQ)2acac, wherein F3Irpic accounts for 16wt%, and Ir(MDQ)2acac accounts for 0.15wt%. The rest of the structure and composition, process and implementation Example 1 is the same.

[0048] image 3 The EL emission spectrum of the present embodiment is shown, as can be seen from the figure, the emission wavelength covers the full band from the blue light of 450nm to the red light of 750nm, and there are near 490nm (blue-green light) and near 610nm (red light) Strong luminous peaks enable effective two-color white luminescence. The difference from Example 1 is that after changing the composition of the luminescent layer, the blue-green luminescence peak around 490nm becomes stronger, and the luminescence in the band between the two luminescence peaks is also enhanced.

[0049] The white light organic electroluminescent device provided by the present invention adopts the excip...

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Abstract

The invention discloses a single-layer all-phosphorescent white light organic electroluminescent device and a preparation method thereof. The structure of the organic electroluminescent device comprises: a substrate, an anode layer located on the surface of the substrate, a functional layer located on the surface of the anode layer, and a functional layer located on the surface of the anode layer. The cathode layer formed on the surface of the functional layer; the functional layer includes a hole transport layer, a blocking layer, a light-emitting layer, an electron transport layer and an electron injection layer; the light-emitting layer is a layer composed of blue (or blue-green) color phosphorescence and red phosphorescence Co-doped in an organic thin film layer formed by an exciplex formed by a hole transport material and an electron transport material, the electroluminescence is a two-color white light spectrum, and the luminescence spectrum is extremely stable. The technical problem to be solved by the present invention is to provide a preparation method of a single-layer all-phosphorescent white light organic electroluminescence device, which effectively improves the stability of the light emission of the device and simplifies the preparation process of the device structure.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence display, and in particular relates to a white light organic electroluminescence device and a preparation method thereof. technical background [0002] Organic light-emitting device (Organic Light‐Emitting Device, OLED) has the advantages of active light emission, thin and portable, low power consumption, wide color gamut, fast response speed, wide temperature range, high contrast ratio and flexible display, etc. Known as the mainstream of next-generation display and lighting technology. Compared with traditional light-emitting devices, OLED can produce large-area planar light sources of any shape and full-color display devices. As a light source and display device, it has characteristics that other traditional light-emitting devices cannot match in terms of light source quality and product features. ; But the stability and working life of the device have always been an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/12H10K50/125H10K50/15H10K50/16H10K71/00
Inventor 张晓宏陶斯禄郑才俊
Owner SUZHOU UNIV
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