Journal
NANOSCALE
Volume 11, Issue 24, Pages 11464-11469Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr03679b
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Funding
- National Natural Science Foundation of China [61675086, 61722504, 51772123]
- National Key Research and Development Program of China [2017YFB0403601]
- Science and Technology Development Program of Jilin Province [20190101016JH]
- Special Project of the Province-University Co-Constructing Program of Jilin University [SXGJXX2017-3]
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Inorganic CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (PNCs) are promising materials for next-generation optoelectronic applications due to their tunable emission and high color purity. However, there is still room to improve their photoluminescence quantum yields (PLQYs) in order to promote their applications. Herein, the PLQY of blue light emitting CsPb(Cl/Br)(3) PNCs was increased to 83% with ammonium hexafluorophosphate by choosing an appropriate treatment time. The salt peeled off the outermost surface of PNCs with halide vacancies and then passivated the surface. This method is effective at improving the PLQYs of different CsPbX3 (X = Cl, Br, I) PNCs covering the entire visible spectrum; the PLQYs were improved to 25% for CsPbCl3 at 398 nm, 83% for CsPb(Cl/Br)(3) at 448 nm, 96% for CsPbBr3 at 504 nm, 86% for CsPb(Br/I)(3) at 568 nm, and 98% for CsPbI3 at 687 nm.
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