题目： | Pure Hydrocarbon Hosts Enabling Efficient Multi-Resonance TADF Blue-Emitting Organic Light-Emitting Diodes |
作者： | Yue-Jian Yang1,2#, Denis Ari3#, Zhe-Hong Yu1,2#, Kelvine Letellier3#, Olivier Jeannin3#, Qi Zheng1,2#, Aziz Khan1,2#, Cassandre Quinton3#, Dong-Ying Zhou1,2*, Zuo-Quan Jiang1,2* & Cyril Poriel3* |
单位： | 1Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, Jiangsu, PR China. 2Jiangsu Key Laboratory for Carbon-Based Functional Materials &Devices, Soochow University, Suzhou, 215123, Jiangsu, PR China. 3Univ Rennes, CNRS, ISCR-UMR CNRS 6226, F-35000 Rennes. |
摘要： | Pure hydrocarbon (PHC) materials are a class of highly efficient and stable host materials for organic light-emitting diodes (OLEDs), composed solely of carbon and hydrogen atoms. Despite recent great advancements in PHC research, their applications are still mainly limited to phosphorescent OLEDs (PHOLEDs). High-performance blue OLEDs still pose a considerable challenge. Thus, expanding PHC materials into other types of OLEDs is critical for advancing organic electronic technologies. In this study, we designed a series of original high-triplet PHC materials based on a multi-substitution approach of the 9,9′-spirobifluorene (SBF) backbone and used them, for the first time, as a host in phosphorescence-sensitized multi-resonance thermally activated delayed fluorescence (MR-TADF) OLEDs. Devices based on the 2,6-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)boron (DtBuCzB) emitter, using FIrpic or fac-Ir(tpz)3 as the sensitizer, achieved high maximum external quantum efficiency (EQEmax) values ranging from 29.1% to 33.9%. Additionally, blue MR-TADF OLED devices based on v-DABNA with a phosphorescent sensitizer (CN−Ir), demonstrated outstanding electroluminescent performance, with an EQEmax of approximately 31% due to an excellent molecular orientation induced by the PHC hosts. All devices exhibited narrow full-width at half-maximum spectra and minimal efficiency roll-off. This study marks the first application of PHC materials as hosts in phosphorescence-sensitized MR-TADF OLEDs, highlighting their potential as promising candidates for next-generation blue OLEDs and offering a viable pathway to achieve high-performance devices. |
影响因子： | 16.1 |
分区情况： | 一区 |
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责任编辑：郭佳