Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 28, Pages 15154-15159Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04090
Keywords
exciton dynamics; quantum efficiency; efficiency roll-off; organic light-emitting diodes; exciton annihilation
Funding
- National Natural Science Foundation of China [51173096, 61177023]
- National Basic Research Program [2015CB655002]
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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)).
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