High Triplet Energy Level Molecule Enables Highly Efficient Sky-Blue Perovskite Light-Emitting Diodes
Autor: | Yanmin Xu, Jinhai Si, Jinfei Dai, Xiaoyun Liu, Jingrui Li, Fang Yuan, Zhaoxin Wu, Hua Dong, Chenjing Zhao, Lihe Yan, Bo Jiao, Chunrong Zhu |
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Rok vydání: | 2021 |
Předmět: |
Brightness
Quenching (fluorescence) Materials science business.industry Exciton Astrophysics::Cosmology and Extragalactic Astrophysics Surface energy law.invention Condensed Matter::Materials Science law Optoelectronics General Materials Science Quantum efficiency Physical and Theoretical Chemistry business Astrophysics::Galaxy Astrophysics Diode Perovskite (structure) Light-emitting diode |
Zdroj: | The journal of physical chemistry letters. 12(48) |
ISSN: | 1948-7185 |
Popis: | The role of triplet states in the interfacial energy transfer in perovskite light-emitting diodes (PeLEDs) has so far not been clarified because of the complex exciton recombination and decay dynamics. This work aims to study this issue and accordingly proposes a novel interfacial-engineering strategy for efficient sky-blue PeLEDs. To this end, bis[2-(diphenylphosphino)phenyl]ether oxide with a high triplet energy level is introduced into sky-blue PeLEDs. It effectively reduces undesirable exciton transfer from the perovskite emission layer to the electron-transport layer, largely suppresses exciton quenching at the interface, and simultaneously passivates defects at the perovskite surfaces. As a result of the multichannel energy-loss reduction, sky-blue PeLED that emits at 488 nm is achieved with a peak external quantum efficiency of 10.17% and a maximum brightness of 6728.41 cd m-2. This work thus provides indirect evidence for the triplet mechanism of blue emission of mixed-halide perovskites and sheds new light on a promising way of boosting the performance of blue PeLEDs. |
Databáze: | OpenAIRE |
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