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Single-layer doped electron transport layer green phosphorescent device and preparation method and application thereof

A technology of electron transport layer and green phosphorescence, which is applied in the direction of electrical solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of easy-to-quench light-emitting layer and low triplet energy level, and achieve simple synthesis and purification, Promotes the formation of amorphous state, the effect of low molecular weight

Pending Publication Date: 2021-04-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, anthracenyl derivatives have a low triplet energy level, less than 1.8eV, lower than the triplet energy level of green phosphorescent materials, and are easy to quench the light-emitting layer.
Therefore, it is a challenge to design and fabricate high-efficiency green phosphorescent devices containing a single-layer anthracene-based electron transport layer.

Method used

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  • Single-layer doped electron transport layer green phosphorescent device and preparation method and application thereof
  • Single-layer doped electron transport layer green phosphorescent device and preparation method and application thereof
  • Single-layer doped electron transport layer green phosphorescent device and preparation method and application thereof

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Embodiment 1

[0042] 1. Using naphthyl anthracenyl-substituted triazine derivatives NaAN-m-TRZ and NaAN-m-PhTRZ as a single-layer doped electron transport layer respectively, a high-efficiency green phosphorescent device was prepared by vacuum evaporation method, BPTRZ-Py -TPO device (prepared according to Chinese patent publication CN 110016053 A) was used as a comparison, and its performance was characterized.

[0043] The structures of high-efficiency green phosphorescent devices are:

[0044] Bottom emission green phosphorescent device: ITO / P008:p-dopant(100nm,4%) / HTL(15nm) / EBL(5nm) / HOST1:HOST2:green phosphorescent iridium complex (30nm,mass ratio 1:1: 0.3) / ETM:Liq (30nm, 1:1) / EIL / Al (2000). The doping ratios are all mass ratios.

[0045] Top-emitting green phosphorescent device: Ag / ITO / P008:p-dopant(147nm,4%) / HTL(15nm) / EBL(5nm) / HOST1:HOST2:green phosphorescent iridium complex (30nm,1:1: 0.3) / ETM:Liq(30nm,1:1) / EIL / Mg:Ag(15nm,1:9) / CP405(70nm).

[0046] Among them, P008:p-dopant is us...

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Abstract

The invention relates to the field of organic small molecule light emitting diodes, and discloses a single-layer doped electron transport layer green phosphorescent device and a preparation method and application thereof. According to the high-efficiency green phosphorescent device provided by the invention, a naphthyl anthryl modified triazinyl organic small molecular electron transport material is introduced. An anthracene unit has a steric hindrance effect with naphthyl and anthryl which are respectively substituted at 9 and 10 positions of the anthracene unit, so that on one hand, formation of an amorphous state can be promoted, and on the other hand, triplet-state energy transfer between the light-emitting layer and the electron transport layer can be blocked. A 1, 3, 5-triazine unit with strong electricity absorption is beneficial to improving the electron injection and transmission performance.

Description

technical field [0001] The invention relates to the field of organic small-molecule light-emitting diodes, in particular to a high-efficiency single-layer doped electron-transport layer green phosphorescent device and its preparation method and application. Background technique [0002] Organic light-emitting diodes (OLEDs) have important applications in the fields of flat panel display and solid-state lighting due to their advantages such as self-luminescence, high contrast ratio, and flexible display. Designing high-efficiency and high-stability OLED devices with a single electron transport layer is of great significance for simplifying device fabrication. Usually, due to the high triplet energy level of the green phosphorescent material, an exciton blocking / electron transport layer is inserted between the electron transport layer and the light-emitting layer, and its triplet energy level is higher than that of the green phosphorescent material. The anthracene unit is eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/24H01L51/50H01L51/54
Inventor 朱旭辉陈玲玲黄小兰王林叶彭俊彪
Owner SOUTH CHINA UNIV OF TECH
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