期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 47, 页码 19928-19937出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c09948
关键词
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资金
- National Natural Science Foundation of China [52073271, 21875236, 22161142004]
- Hefei National Synchrotron Radiation Laboratory [KY2060000172]
- State Key Laboratory of Luminescence and Applications [SKLA-2020-06]
- USTC Center for Micro and Nanoscale Research and Fabrication
This study presents a new type of PNCLED using large-size CsPbBr3 PNCs, which achieves ultra-narrow emission line width and rapid brightness rise. By utilizing unconventional materials and processing methods, detrimental effects caused by the quantum confinement effect in the device are avoided, realizing the highest color purity in green PNCLED.
Lead halide perovskite nanocrystals (PNCs) are emerging as promising light emitters to be actively explored for high color purity and efficient light-emitting diodes. However, the most reported lead halide perovskite nanocrystal light-emitting diodes (PNCLEDs) encountered issues of emission line width broadening and operation voltage elevating caused by the quantum confinement effect. Here, we report a new type of PNCLED using large-size CsPbBr3 PNCs overly exceeding the Bohr exciton diameter, achieving ultranarrow emission line width and rapid brightness rise around the turn-on voltage. We adopt calcium-tributylphosphine oxide hybrid ligand passivation to produce highly dispersed largesize colloidal CsPbBr3 PNCs with a weak size confinement effect and also high photoluminescence quantum yield (similar to 85%). Utilizing these large-size PNCs as emitters, we manifest that the detrimental effects caused by the quantum confinement effect can be avoided in the device, thereby realizing the highest color purity in green PNCLED, with a narrow full width at half-maximum of 16.4 nm and a high corrected maximum external quantum efficiency of 17.85%. Moreover, the operation half-life time of the large-size PNCLED is 5-fold of that based on smaller-size PNCs. Our work provides a new avenue for improving the performance of PNCLEDs based on unconventional large-size effects.
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