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A deep blue organic electroluminescent device and its preparation method

A deep blue, electroluminescent technology, applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of poor performance of blue OLEDs, unsatisfactory performance of light-emitting devices, poor stability and color purity, etc. Good spectral stability, low efficiency roll-off, good color purity

Inactive Publication Date: 2018-04-24
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, OLEDs prepared by green light materials have shown high efficiency and strong luminous brightness, while the performance of blue and red light-emitting electroluminescent devices has not been ideal [see: (a) J. Huang, N. Sun, J. Yang, R. Tang, Q. Li, D. Ma, Z. Li, Adv. Funct. Mater. 2014, 24, 7645.]
The blue light material itself has a wide energy gap, and the inherent high energy gap makes it difficult for charges to be injected into the light-emitting material, resulting in poor performance of blue light OLEDs [see: M.Zhu, C.Yang, Chem.Soc.Rev., 2013, 42, 4963 .]
The reported organic electroluminescent blue light-emitting devices have many shortcomings, including high starting voltage, low luminous efficiency, weak luminous intensity, poor stability and color purity [see: (a) Z.Q.Jiang, Z.Y.Liu, C.L.Yang, C .Zhong, J.G.Qin, G.Yu, Y.Q.Liu, Adv.Funct.Mater.2009, 19, 3987; (b) B.Wei, J.Z.Liu, Y.Zhang, J.H.Zhang, H.N.Peng, H.L.Fan, Y.B.He , X.C.Gao, Adv.Funct.Mater.2010, 20, 2448; (c) Y.Zou, J.Zou, T.Ye, H.Li, C.Yang, H.Wu, D.Ma, J.Qin ,Y.Cao,Adv.Funct.Mater.2013,23,1781.]

Method used

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  • A deep blue organic electroluminescent device and its preparation method
  • A deep blue organic electroluminescent device and its preparation method
  • A deep blue organic electroluminescent device and its preparation method

Examples

Experimental program
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Embodiment 1

[0034] Example 1: Synthesis of 2-(5-(4'-(diphenylamino)-[1,1'-diphenyl]-4-)oxazol-2-yl)phenol

[0035] (1) Under nitrogen protection, phenoxyacetimide (2.0mmol, 302mg), 4'-(5-oxazolyl)-N,N-diphenyl-[1,1'-diphenyl] -4-amine (3.0mmol, 1164mg), dichloro(pentamethylcyclopentadienyl) rhodium (III) dimer (5.0mol%, 64mg), silver hexafluoroantimonate (20mol%, 136mg) , pivalic acid (4.0mmol, 410mg), cesium pivalate (1.6mmol, 380mg) and silver carbonate (0.8mmol, 220mg) were added to a reaction tube equipped with a magnetic stirrer, and N,N- Dimethylformamide (10.0 mL) was stirred at room temperature for 5 minutes, and then reacted at 140° C. for 24 hours. After the reaction was completed, the reaction tube was cooled to room temperature, ethyl acetate was added to dilute the reaction system, filtered through diatomaceous earth, and washed with ethyl acetate, the filtrates were combined, the solvent was removed under reduced pressure, and the residue was subjected to silica gel column ...

Embodiment 2

[0036] Embodiment 2: first chemically corrode the ITO anode layer on the ITO glass substrate into 10 mm wide, 30 mm long strip-shaped electrodes, then use cleaning solution, deionized water ultrasonic cleaning for 20 minutes and put into oven to dry . Then put the dried substrate into the pre-treatment vacuum chamber, carry out low-pressure plasma treatment with a voltage of 250 volts for 10 minutes under the atmosphere of vacuum degree of 10 Pa, and then transfer it to the organic evaporation chamber, wait for vacuum The degree is not higher than 5×10 -5 At the same time, on the ITO layer, a 50-nanometer-thick TAPC hole-transport layer, a 20-nanometer-thick 2-(5-(4'-(diphenylamino)-[1,1'-di Emitting layer of phenyl]-4-)oxazol-2-yl)phenol doped with 3,3'-(9hydrogen-fluoren-9,9-yl)bis(9-phenyl-9hydrogen-carbazole) , 50nm thick TmPyPB electron transport layer, then transfer it to the metal evaporation chamber, in 5-8×10 -5 A 1.0 nm-thick LiF buffer layer was sequentially evap...

Embodiment 3

[0037] Embodiment 3: first chemically corrode the ITO anode layer on the ITO glass substrate into 10 mm wide, 30 mm long strip-shaped electrodes, then use cleaning solution, deionized water ultrasonic cleaning for 20 minutes and put into oven to dry . Then put the dried substrate into the pre-treatment vacuum chamber, carry out low-pressure plasma treatment with a voltage of 250 volts for 10 minutes under the atmosphere of vacuum degree of 10 Pa, and then transfer it to the organic evaporation chamber, wait for vacuum The degree is not higher than 5×10 -5 At the same time, on the ITO layer, a 50-nanometer-thick TAPC hole-transport layer, a 20-nanometer-thick 2-(5-(4'-(diphenylamino)-[1,1'-di Emitting layer of phenyl]-4-)oxazol-2-yl)phenol doped with 3,3'-(9hydrogen-fluoren-9,9-yl)bis(9-phenyl-9hydrogen-carbazole) , 50nm thick TmPyPB electron transport layer, then transfer it to the metal evaporation chamber, in 5-8×10 -5 A 1.0 nm-thick LiF buffer layer was sequentially evap...

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Abstract

The invention belongs to a dark blue organic electroluminescent device and a preparation method thereof. A vacuum evaporation process was used to prepare a glass substrate / indium tin oxide (3 nm) / 4,4'-cyclohexyl bis[N,N-bis(4-methylphenyl)aniline] (50 nm ) / 2‑(5‑(4'‑(diphenylamino)‑[1,1'‑diphenyl]‑4‑)oxazol‑2‑yl)phenol (5‑17%): 3, 3'-(9hydro-fluorene-9,9-yl)bis(9-phenyl-9hydro-carbazole) (20 nm) / 3,3'-[5'-[3-(3-pyridyl )phenyl][1,1',3',1''-terphenyl]-3,3''-diyl]dipyridine (50 nm) / lithium fluoride (1 nm) / aluminum (100 nm) . When 2-(5-(4'-(diphenylamino)-[1,1'-diphenyl]-4-)oxazol-2-yl)phenol was doped into the host at a concentration of 13 wt% The device prepared in molecular CBZ2‑F1 has a maximum external quantum efficiency of 7.1%, a maximum brightness of 9054 cd / m2, a maximum power efficiency of 4.89 lm / W, and a maximum current efficiency of 5.04 cd / A. The luminescent color coordinates of the device are CIE1931 (0.15, 0.08), which is very close to the international blue light standard CIE1931 (0.14, 0.08), and it is the dark blue electroluminescent device with the best performance reported so far.

Description

technical field [0001] The invention relates to a dark blue organic electroluminescence device and a preparation method thereof. Background technique [0002] Organic light-emitting diodes (OLEDs) have broad application prospects and are expected to become the mainstream and lighting source of next-generation displays. The research on OLEDs has attracted great attention and attention from academic and industrial circles around the world [see: (a) Kido, J ., Kimura, M., Nagai, K. Science.1995, 267, 1332; (b) J. Liu, Q. Zhou, Y. Cheng, Y. Geng, L. Wang, D. Ma, X. Jing, F. Wang, Adv. Mater. 2005, 17, 2974; (c) H. Uoyama, K. Goushi, K. Shizu, H. Nomura, C. Adachi, Nature 2012, 492, 234.]. OLEDs have many advantages, such as: full-color display, low driving voltage, fast response speed, active light emission, light and thin, full viewing angle, bendable and foldable devices, low cost, simple production process, and large-area production [see: (a) L. Wang, Y. Jiang, J. Luo, Y. Z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K85/00H10K50/15H10K50/16H10K50/11H10K50/00H10K71/00
Inventor 游劲松李必进周亮兰静波吴迪
Owner SICHUAN UNIV