华工国重 苏仕健 Adv. Sci.：高量子产率和短寿命纯有机磷光材料的开发，用于高效OLED

一、成果简介

纯有机室温磷光材料由于具有理论上禁止自旋的三重态，通常表现出较低的磷光量子产率(ϕP)和较长的磷光寿命(τP)。

在此，通过引入一个给体-受体(D-A)骨架和一个phenoxaselenine给体，在非晶膜中开发了三个具有高的ϕP和短的τP的非芳香胺给体化合物。除了硒的重原子效应增强了自旋轨道耦合(SOC)外，促进轨道角动量变化的D-A骨架进一步增强了SOC，刚性分子结构也抑制了严重的非辐射能量耗散。因此，基于2-(phenoxaselenin-3-yl)-4,6-二苯基-1,3,5-三嗪(PXSeDRZ)的RTP有机发光二极管(OLED)实现了19.5%的创纪录的高外量子效率。此外，还实现了电压依赖的颜色可调发射和单分子白色发射。

这些结果揭示了纯有机磷光材料作为高效OLED发射器的广阔前景，特别是在潜在的迷人照明应用中。

二、图文导读

Molecular structures of the investigated compounds and molecular design strategy.

Steady-state PL (at 298 and 77 K) and phosphorescence (at 77 K with a delay time of 5 ms) spectra of the investigated compounds in toluene solvent (10−5 m), and their photophysical parameters of kf and knr + kisc.

a) Steady-state PL spectra in air and vacuum status, and phosphorescence spectra in vacuum with a time delay of 5–10 ms. b) Transient phosphorescence decay spectra. c) Time-resolved PL spectra; d ϕP and triplet state non-radiative rates ( ) at different temperatures in vacuum of the investigated compounds in 10 wt% doped mCP films.

a) Calculated energy level diagram, SOC matrix elements, and NTOs of PXSeDRZ. b) Representative molecular vibration modes and corresponding Huang–Rhys (H–R) factors, and intramolecular interaction visualized by independent gradient model based on Hirshfeld partition (IGMh) analyses.

a) Energy-level diagram and architecture of the OLED devices. b) EQE-J curves of the OLED devices. c) J–V–L curves of the OLED devices. d) EL spectra of the OLED devices detected at 1 cd m−2.

三、论文信息

Advanced Science

Highly Efficient Purely Organic Phosphorescence Light-Emitting Diodes Employing a Donor–Acceptor Skeleton with a Phenoxaselenine Donor

Zijian Chen, Mengke Li, Qing Gu, Xiaomei Peng, Weidong Qiu, Wentao Xie, Denghui Liu, Yihang Jiao, Kunkun Liu, Jiadong Zhou, Shi-Jian Su

First published: 20 February 2023

https://doi.org/10.1002/advs.202207003

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