一、成果簡介

純有機(jī)室溫磷光材料由于具有理論上禁止自旋的三重態(tài)，通常表現(xiàn)出較低的磷光量子產(chǎn)率(?P)和較長的磷光壽命(τP)。

在此，通過引入一個(gè)給體-受體(D-A)骨架和一個(gè)phenoxaselenine給體，在非晶膜中開發(fā)了三個(gè)具有高的?P和短的τP的非芳香胺給體化合物。除了硒的重原子效應(yīng)增強(qiáng)了自旋軌道耦合(SOC)外，促進(jìn)軌道角動(dòng)量變化的D-A骨架進(jìn)一步增強(qiáng)了SOC，剛性分子結(jié)構(gòu)也抑制了嚴(yán)重的非輻射能量耗散。因此，基于2-(phenoxaselenin-3-yl)-4,6-二苯基-1,3,5-三嗪(PXSeDRZ)的RTP有機(jī)發(fā)光二極管(OLED)實(shí)現(xiàn)了19.5%的創(chuàng)紀(jì)錄的高外量子效率。此外，還實(shí)現(xiàn)了電壓依賴的顏色可調(diào)發(fā)射和單分子白色發(fā)射。

這些結(jié)果揭示了純有機(jī)磷光材料作為高效OLED發(fā)射器的廣闊前景，特別是在潛在的迷人照明應(yīng)用中。

二、圖文導(dǎo)讀

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 ?P 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、論文信息

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

耀嘉科技有限公司作為日本濱松光子的量子產(chǎn)率分析儀，熒光壽命分析儀和條紋相機(jī)專業(yè)的供應(yīng)商。

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