Zeolites as host matrix for luminescent carbon dots: a new class of thermally activated delayed fluorescence materials with 350 ms delayed decay time

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2017,（9）
• 页码范围: 1147-1148
• 页数: 2页
• 语种: 英文
• DOI: 10.1007/s11426-017-9110-8

摘要

Organic light-emitting diodes (OLEDs) have attracted considerable attentions from both academia and industry for decades because of their potential applications in full color flat-panel displays and solid state lightings.Since 2009 [1],thermally activated delayed fluorescence (TADF) OLEDs have drawn intense attention due to the utilization of low-cost organic luminogens by harvesting all singlet and triplet excitons to theoretically reach 100％ internal quantum efficiency.Generally,there are several ways to demonstrate the TADF characteristics,such as small singlet and triplet bandgap (△EST) for efficient reverse intersystem crossing (RISC),over microsecond-scale delayed lifetime,the temperature-dependant photoluminescence (PL) decay as well as a significantly enhanced PL quantum yield (PLQY) at oxygen free conditions.TADF materials can be classified into several types according to structural variations,like metal (Sn or Cu) complexes,fullerene derivative,exciplex,polymers,small-molecule organic accepter and D-A type small molecules.Among,D-A type small molecules comprising electron-donating (D) and electron-accepting (A) subunits have been mostly investigated in TADF OLEDs with external quantum efficiency over 20％.