D-O-A based organic phosphors for both aggregation-induced electrophosphorescence and host-free sensitization

Lulin Xu, Yuhang Mo, Ning Su, Changshen Shi (), Ning Sun, Yuewei Zhang (), Lian Duan, Zheng-Hong Lu and Junqiao Ding ()
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Lulin Xu: Yunnan University
Yuhang Mo: Yunnan University
Ning Su: Yunnan University
Changshen Shi: Yunnan University
Ning Sun: Yunnan University
Yuewei Zhang: Tsinghua University
Lian Duan: Tsinghua University
Zheng-Hong Lu: Yunnan University
Junqiao Ding: Yunnan University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Pure organic phosphors capable of room-temperature phosphorescence show a great potential in organic light-emitting diodes, while it is limited by the big challenge to realize efficient electroluminescence under electric excitation. Herein, we develop a class of organic phosphors based on acridine as the electron donor, triazine as the electron acceptor and oxygen as the bridge between them. Benefitting from the characteristic donor-oxygen-acceptor geometry, these compounds are found to behave an exciting aggregation-induced organic room-temperature electrophosphorescence, and achieve a record-high external quantum efficiency of 15.8% for non-doped devices. Furthermore, they can sensitize multi-resonant emitters in the absence of any additional wide bandgap host, leading to an effective narrowband emission with a peak external quantum efficiency of 26.4% and a small full-width at half maximum of 26 nm. The results clearly indicate that donor-oxygen-acceptor geometry is a promising strategy to design organic phosphors suitable for organic light-emitting diodes.

Date: 2023
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DOI: 10.1038/s41467-023-37414-y

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