Organic fluorophores with unique photophysical properties that converting the triplet excitons to singlet excitons, are desired to improve the efficiencies of organic light-emitting diodes (OLEDs). Here, two new anthracene-based emitters pipdAnCz and pipdAnTPA, with proper donor and acceptor substituents are designed and synthesized. The theoretical calculation and experimental results demonstrate that both pipdAnCz and pipdAnTPA possess hot exciton and triplet-triplet annihilation (TTA) characteristics, which can convert the triplet excitons to singlet excitons from the high-lying triplet energy levels (T_n) and the lowest triplet energy level (T₁) respectively. Due to its relative higher photoluminescence quantum yields (PLQYs), the pipdAnTPA based non-doped device achieved a maximum external quantum efficiency (EQE_max) of 6.43% with an exciton utilization efficiency (EUE) of 72%. Further device physics study reveal that the hot exciton process is the dominant mechanism, assisted by TTA process, to convert the triplet excitons, especially for the pipdAnTPA based device.

有机荧光团具有独特的光物理特性，可将三线态激子转化为单线态激子，因此需要提高有机发光二极管 (OLED) 的效率。在这里，设计并合成了两种新的蒽基发射体 pipdAnCz 和 pipdAnTPA，它们具有适当的供体和受体取代基。理论计算和实验结果表明，pipdAnCz 和 pipdAnTPA 均具有热激子和三重态-三重态湮灭 (TTA) 特性，可以将三重态激子从高三重态能级 (T n ) 和最低三重态激子转化为单重态_激子能级（T ₁ ）分别。由于其相对较高的光致发光量子产率(PLQYs)，基于 pipdAnTPA 的非掺杂器件实现了6.43% 的_{最大外部量子效率 (EQE max ) 和 72% 的激子利用效率 (EUE)。}进一步的器件物理研究表明，在 TTA 过程的辅助下，热激子过程是转换三重态激子的主要机制，特别是对于基于 pipdAnTPA 的器件。