Zhang Yi-Pin, Mao Meng-Xi, Song Shi-Quan, Wang Yi, Zheng You-Xuan, Zuo Jing-Lin, Pan Yi
State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Angew Chem Int Ed Engl. 2022 Jun 7;61(23):e202200290. doi: 10.1002/anie.202200290. Epub 2022 Apr 5.
In this study, we report the first circularly polarized white organic light-emitting diodes (CP-WOLEDs) based on all thermally activated delayed fluorescence (TADF) materials. Two pairs of spiro-type TADF enantiomers, (R/S)-SPOCN (5,5'-((2,2',3,3'-tetrahydro-1,1'-spirobi[indene]-7,7'-diyl)bis(oxy))bis(4-(10H-phenoxazin-10-yl)phthalonitrile)) and (R/S)-OSFSO (2'-(trifluoromethyl)-spiro[quinolino[3,2,1-kl]phenoxazine-9,9'-thioxanthene]-10',10'-dioxide), serve as emitters with complementary emission. The CP-OLEDs exhibit warm white emission with a CIE coordinate of (0.35, 0.46). Besides, decent device performances are observed with an external quantum efficiency of up to 21.6 % at maximum and 11.8 % at 1000 cd m . Obvious circularly polarized electroluminescence signals are detected with a dissymmetry factor |g | of around 3.0×10 . This is the first report of CP-WOLEDs that can harvest both singlet and triplet excitons, which provides a feasible strategy for the development of CP-WOLEDs with remarkable device performances.
在本研究中，我们报道了首个基于全热激活延迟荧光（TADF）材料的圆偏振白色有机发光二极管（CP-WOLED）。两对螺环型TADF对映体，（R/S）-SPOCN（5,5'-((2,2',3,3'-四氢-1,1'-螺二茚-7,7'-二基)双(氧基))双(4-(10H-吩恶嗪-10-基)邻苯二甲腈)）和（R/S）-OSFSO（2'-(三氟甲基)-螺[喹啉并[3,2,1-kl]吩恶嗪-9,9'-噻吨]-10',10'-二氧化物），用作具有互补发射的发光体。该CP-OLED呈现出暖白色发射，CIE坐标为(0.35, 0.46)。此外，观察到良好的器件性能，最大外量子效率高达21.6%，在1000 cd m时为11.8%。检测到明显的圆偏振电致发光信号，不对称因子|g|约为3.0×10 。这是关于能够同时捕获单线态和三线态激子的CP-WOLED的首次报道，为开发具有卓越器件性能的CP-WOLED提供了一种可行策略。
