applications, respectively). Through molecular design, exciton dynamic process rate constants including fluorescence (kF), intersystem crossing (kISC), internal conversion (kIC) and reverse intersystem crossing (kRISC) are selectively altered, affording four representative TADF emitters. Based on lifetime and quantum yield measurements, kF, kISC, kIC and kRISC are calculated for four emitters and their
关于激发态寿命(问题τ TADF)热活化延迟荧光的调谐(TADF)材料可用于有机发光二极管(OLED)应用程序和其他特定字段是至关重要的。对于TADF-OLED中,使用发射器与短τ TADF引起抑制的单线态-三线态湮灭(STA)和三重态-三重态湮灭(
TTA),导致降低的效率滚降在实际相关的亮度(100和1000 CD米- 2分别用于显示和照明应用)。通过分子设计,激子动态过程速率常数包括荧光(k F),系统间交叉(k ISC),内部转化(k IC)和反向系统间交叉(k RISC)被有选择地改变,提供了四个代表性的TADF发射器。基于寿命和量子产率测量,计算了四个发射器的k F,k ISC,k IC和k RISC,它们的相互关系匹配了校正的随时间变化的密度泛函理论模拟。其中,即使具有较小的k F,较低的光致发光量子效率(Φ)和较大的k ISC,具有单峰-三重态分裂能(ΔE ST)的分子)和最