期刊
CHEMICAL SCIENCE
卷 13, 期 13, 页码 3719-3727出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc06554h
关键词
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资金
- National Key RD Program [2018YFC1800600]
- National Natural Science Foundation of China [NSFC 22175113, 42007125]
- China Postdoctoral Science Foundation [2021M702115]
- Shanghai Jiao Tong University Scientific and Technological Innovation Funds
- Guangdong Province's 2018-2019 Key RD Program [2019B010924001]
By passivating the surface defects and constructing a core-shell structure of CsPbBr3 nanocrystals, the thermal quenching behavior of light emission is effectively suppressed, leading to improved stability of emission intensity. Based on these thermally stable nanocrystals, temperature-stable white LED devices are achieved.
Lead halide perovskite nanocrystals as promising ultrapure emitters are outstanding candidates for next-generation light-emitting diodes (LEDs) and display applications, but the thermal quenching behavior of light emission has severely hampered their real-world applications. Here, we report an anion passivation strategy to suppress the emission thermal quenching behavior of CsPbBr3 perovskite nanocrystals. By treating with specific anions (such as SO42-, OH-, and F- ions), the corresponding wide-bandgap passivation layers, PbSO4, Pb(OH)(2), and PbF2, were obtained. They not only repair the surface defects of CsPbBr3 nanocrystals but also stabilize the phase structure of the inner CsPbBr3 core by constructing a core-shell like structure. The photoluminescence thermal resistance experiments show that the treated sample could preserve 79% of its original emission intensity up to 373 K, far superior to that (17%) of pristine CsPbBr3. Based on the thermally stable CsPbBr3 nanocrystals, we achieved temperature-stable white LED devices with a stable electroluminescence spectrum, color gamut and color coordinates in thermal stress tests (up to 373 K).
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