【摘 要】
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Materials with a small singlet-triplet exchange energy(ΔEST)have been used as dopants to generate thermally activated delayed fluorescence(TADF),showing th
【机 构】
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Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education,Department of Ch
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Materials with a small singlet-triplet exchange energy(ΔEST)have been used as dopants to generate thermally activated delayed fluorescence(TADF),showing the potential to achieve 100%internal quantum efficiency in OLEDs without using expensive noble metal complexes.However,a small ΔEST would always lead to a low photoluminescence efficiency(ΦPL).Here,we demonstrate that this trade-off can be broken by using materials with a small ΔEST as sensitizing hosts for conventional fluorescent dopants.When a host with TADF is doped with a high ΦPL dopant,the host and the dopant are responsible for the thermally activated up-conversion and the radiative decay of excitons,respectively,leading to high performance OLEDs.
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