Overcoming power efficiency limitation of white fluorescence light-emitting diodes via multilevel-hydrogen-bond matrix  

作　　者：Ruiming Du Peng Ma Yi Man Yudong Pang Chunbo Duan Chunmiao Han Jing Zhang Chenhui Cao Ying Wei Xinfeng Shui Hui Xu 

机构地区：[1]Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education and School of Chemistry and Material Science,Heilongjiang University,Harbin,P.R.China [2]Anhui Sholon New Material Technology Co.,Ltd.,Chuzhou,P.R.China

出　　处：《Aggregate》2023年第6期180-190,共11页聚集体（英文）

基　　金：Natural Science Foundation of China,Grant/Award Numbers:92061205,62175060,51873056,61905070,22005088;Changjiang Scholar Program of Chinese Ministry of Education,Grant/Award Number:Q2021256;Natural Science Fund for Excellent Young Scholars of Heilongjiang Province,Grant/Award Numbers:YQ2020B006,YQ2022B010。

摘　　要：High power efficiency and low efficiency roll-off at practical luminance are two requirements for new-generation energy-saving lighting technologies,which are still bottlenecks of thermally activated delayed fluorescence(TADF)white organic light-emitting diodes(WOLED),despite the advantages of TADF materials and devices in low cost and high sustainability.Herein,we developed a spiro phosphine oxide host named SSOXSPO,which can form multiple and multidirectional intermolecular hydrogen bonds(IHB).The resulted multilevel IHB network integrates long-range ordered and short-range disordered alignments for suppressing triplet-polaron quenching(TPQ)and triplet-triplet annihilation(TTA).Electronic characteristics of SSOXSPO matrix are further regulated,leading to the optimal exciton allocation through balancing energy and charge transfer.As consequence,using SSOXSPO as host,the single-emissive-layer TADF WOLEDs realized the record performance,including ultralow operation voltage as∼4.0 V,power efficiency beyond fluorescent tube(70.1 lm W−1)and negligible external quantum efficiency roll-off(3%)at 1000 nits for indoor lighting.This work demonstrates that multiple interplays supported by host matrixes in TADF WOLEDs can facilitate the synergistic effects of TADF emitters on 100%exciton utilization.

关 键 词：hydrogen bond MATRIX power efficiency thermally activated delayedfluorescence white organic light-emitting diode 

分 类 号：TN312.8[电子电信—物理电子学]