材料科学
共发射极
有机发光二极管
光电子学
激子
偶极子
二极管
跃迁偶极矩
电致发光
量子效率
自发辐射
发光二极管
光学
图层(电子)
纳米技术
物理
激光器
量子力学
作者
Xiaomei Peng,Weidong Qiu,Wenqi Li,Mengke Li,Wentao Xie,Wei Li,Jianying Lin,Jiaji Yang,Xin Li,Shi‐Jian Su
标识
DOI:10.1002/adfm.202203022
摘要
Abstract Radiative exciton generation and light out‐coupling are two crucial factors for highly efficient organic light‐emitting diodes (OLEDs). Herein, a thermally activated delayed fluorescence (TADF) material DspiroS‐TRZ with high horizontal dipole ratio (HDR, Θ // = 82%) is utilized as the blue emitter as well as the host for an orange‐red TADF emitter TPA‐AQ to fabricate white OLEDs. A synergetic horizontal dipole orientation induction on the transition dipole moment of TPA‐AQ is achieved by the highly orientated DspiroS‐TRZ, resulting in high HDR (Θ // = 96%) of the orange‐red emitter. Owing to the simultaneous efficient triplet exciton utilization and highly orientated binary system, a maximum external quantum efficiency (EQE max ) of 29.3% is achieved for single emission layer (EML) white OLED, with an excellent white light out‐coupling efficiency of 34%. In addition, the carrier recombination in the EML is further regulated by inserting an exciton regulation emission layer, which can relieve the trapping effect of the orange‐red emitter and guarantee stable Langevin recombination and energy transfer processes for improved electroluminescence spectral stability. An EQE max of 31.2% is ultimately achieved for the double‐EML white OLED, highlighting the key role of horizontal dipole orientation induction and carrier recombination modulation for highly efficient and spectral stable white OLEDs.
科研通智能强力驱动
Strongly Powered by AbleSci AI