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Lattice strain modulation toward efficient blue perovskite light-emitting diodes.


ABSTRACT: The successful implementation of perovskite light-emitting diodes (PeLEDs) in advanced displays and lighting has proven to be challenging because of the inferior performance of blue devices. Here, we point out that a strained system would lead to the quasi-degenerate energy state to enhance the excited-state transition due to the formation of double-polarized transition channel. The tensile strained structure also brings about a synergetic control of the carrier dynamics in virtue of lattice structure deformation and reduced dimensional phase regulation to promote carrier population in large bandgap domains and to realize near-unit energy transfer from the large bandgap phases to the emitter phases. Accordingly, high external quantum efficiencies of 14.71 and 10.11% are achieved for the 488- and 483-nanometer PeLEDs. This work represents a versatile strategy using a strained system to achieve enhanced radiative emission for the development of efficient PeLEDs.

SUBMITTER: Liu B 

PROVIDER: S-EPMC9506712 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Lattice strain modulation toward efficient blue perovskite light-emitting diodes.

Liu Baoxing B   Li Junzi J   Wang Gui G   Ye Fanghao F   Yan Huibo H   Zhang Meng M   Dong Shou-Cheng SC   Lu Lei L   Huang Pu P   He Tingchao T   Xu Ping P   Kwok Hoi-Sing HS   Li Guijun G  

Science advances 20220923 38


The successful implementation of perovskite light-emitting diodes (PeLEDs) in advanced displays and lighting has proven to be challenging because of the inferior performance of blue devices. Here, we point out that a strained system would lead to the quasi-degenerate energy state to enhance the excited-state transition due to the formation of double-polarized transition channel. The tensile strained structure also brings about a synergetic control of the carrier dynamics in virtue of lattice str  ...[more]

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