Thermally Activated Delayed Fluorescence Sensitized Phosphorescence: A Strategy To Break the Trade-Off between Efficiency and Efficiency Roll-Off

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 t...

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Published inACS applied materials & interfaces Vol. 7; no. 28; pp. 15154 - 15159
Main Authors Li, Chen, Duan, Lian, Zhang, Dongdong, Qiu, Yong
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 22.07.2015
Subjects
energy transfer
fluorescence
phosphorescence
efficiency roll-off
quantum efficiency
exciton annihilation
exciton dynamics
organic light-emitting diodes
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Summary: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 crossing, 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 Förster 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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ISSN:1944-8244
1944-8252
1944-8252
DOI:10.1021/acsami.5b04090