期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 48, 页码 57560-57566出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16428
关键词
thermodynamics; carrier injection; perovskite; quantum dot; spectral stability; deep-blue LEDs
资金
- Young Scientific and Technological Innovation Research Team Funds of Sichuan Province [20CXTD0106, 2019YFG0292]
- Fundamental Research Funds for the Central Universities [2682020CX06]
By employing an ultrafast thermodynamics-induced injection enhancement strategy, this study successfully promotes efficient carrier recombination within PeLEDs, improving their thermal performance and spectral stability, achieving more stable deep-blue PeLEDs.
Precisely tuning emission spectra through the component control of mixed halides has been proved to be an efficient method for procuring deep-blue perovskite LEDs (PeLEDs). However, the inferior color instability and lifetime attenuation, originated from vacancy- and trap-mediated mechanisms under an external field, remain an uninterruptedly formidable challenge for the commercial development of PeLEDs. Here, an ultrafast thermodynamics-induced injection enhancement strategy was employed to promote efficient carrier recombination within perovskite quantum dots (QDs), accompanied by less inefficient charge accumulation and trap generation, enabling deep-blue PeLEDs with improved thermal and spectral stability. The resultant PeLEDs feature an external quantum efficiency (EQE) of 3.66%, a max luminance of 2100 cd/m(2) at the electroluminescence (EL) of 460 nm, and a halftime of 288 s. This work provides a general platform for promoting the EL performances and a deep insight into unraveling the degradation mechanism of blue PeLEDs.
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