Journal
PHYSICAL REVIEW APPLIED
Volume 3, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.3.014001
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Funding
- Japan Society for the Promotion of Science (JSPS) through the Funding Program for World-Leading Innovative R&D on Science and technology (FIRST Program).
- Grants-in-Aid for Scientific Research [15K05607, 24102014, 24550210] Funding Source: KAKEN
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Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N-1-[4-(4,6-diphenyl-1,3, 5-triazin-2-yl)phenyl]-N-1-[4-(diphenylamino)-phenyl]-N-4, N-4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100% when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8%, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.
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