近日，中国科学院长春应用化学研究所的朱峰及其研究团队取得一项新进展。经过不懈努力，他们研制出高效结晶白光有机发光二极管。相关研究成果已于2024年4月8日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队报道了一种具有嵌入纳米聚集体(NA)结构的晶体宿主基质(CHM)，该基质采用热活化延迟荧光(TADF)材料和橙色磷光掺杂剂(Phos.-D)来开发高性能的C-WOLEDs。晶体宿主基质-热活化延迟荧光金属纳米粒子-D-白色有机发光二极管的外部量子效率为12.8%，是基于晶体材料的性能最高的WOLED。

该器件具备激子的迅速形成能力，同时拥有精心设计的能量传递过程，使其亮度和电流密度实现快速上升。与近期报道的基于非晶材料的高性能WOLEDs相比，C-WOLED在降低串联电阻焦耳热损耗和提高光子输出方面表现出色，预示着其在下一代WOLEDs开发中的巨大应用前景。

据悉，晶体白色有机发光二极管(C-WOLEDs)是照明和显示应用的有前途的候选者。然而，迫切需要开发出大功率发射和稳定的节能高效C-WOLEDs来满足商用需求。

附：英文原文

Title: High-efficiency crystalline white organic light-emitting diodes

Author: Liu, Yijun, Zhu, Feng, Wang, Yue, Yan, Donghang

Issue&Volume: 2024-04-08

Abstract: Crystalline white organic light-emitting diodes (C-WOLEDs) are promising candidates for lighting and display applications. It is urgently necessary, however, to develop energy-saving and high-efficiency C-WOLEDs that have stable and powerful emission to meet commercial demands. Here, we report a crystalline host matrix (CHM) with embedded nanoaggregates (NA) structure for developing high-performance C-WOLEDs by employing a thermally activated delayed fluorescence (TADF) material and orange phosphorescent dopants (Phos.-D). The CHM-TADFNA-D WOLED exhibit a remarkable EQE of 12.8%, which is the highest performance WOLEDs based on crystalline materials. The device has a quick formation of excitons and a well-designed energy transfer process, and possesses a fast ramping of luminance and current density. Compared to recently reported high-performance WOLEDs based on amorphous material route, the C-WOLED achieves a low series-resistance Joule-heat loss ratio and an enhanced photon output, demonstrating its significant potential in developing the next-generation WOLEDs.

DOI: 10.1038/s41377-024-01428-y

Source: https://www.nature.com/articles/s41377-024-01428-y