Thermally Activated Delayed Fluorescence Sensitized Phosphorescence: A Strategy To Break the Trade-Off between Efficiency and Efficiency Roll-Off
Thermally Activated Delayed Fluorescence Sensitized Phosphorescence: A Strategy To Break the Trade-Off between Efficiency and Efficiency Roll-Off
复制标题
热激活延迟荧光敏化磷光：打破效率和效率滚降之间权衡的策略
DOI：
10.1021/acsami.5b04090
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发表时间：
2015-07-22
影响因子：
9.5
通讯作者：
Qiu, Yong
中科院分区：
文献类型：
--
作者：
Li, Chen;Duan, Lian;Qiu, Yong
具有热激活延迟荧光(TADF)的材料实现了100%的内量子效率(IQE)，但遭受了显著的效率下降。在这里，激子动力学研究表明，含有TADF的材料可能在影响效率滚降方面扮演相反的角色：一方面，由于快速的系统间反向剂量，降低了三重态密度，另一方面，由于减弱的单重态辐射，增加了三重态密度。理论和实验表明，TADF敏化磷光可以通过利用有效的Forster能量转移来打破这一权衡，同时实现100%的IQE和低效率的滚降(临界电流密度为460 mA cm(-2))。
Materials with thermally activated delayed fluorescence (TADF) realized 100% internal quantum efficiency (IQE) but suffered, significant efficiency roll-off. Here, an exciton dynamics study reveals that materials with TADF may play Opposite roles in affecting the efficiency roll-off: decreasing the triplet density due to the fast reverse intersystem dossing, on the one hand, and increasing the triplet density due to the weakened singlet radiation. We show theoretically and experimentally that TADF-sensitized phosphorescence can break this trade-off by exploiting the efficient Forster energy transfer and simultaneously achieve 100% IQE and low efficiency roll-off (with a critical current density of 460 mA cm(-2)).