Journal
PHYSICA B-CONDENSED MATTER
Volume 633, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physb.2022.413788
Keywords
Lead-free perovskite; Green solvent; Phosphors; Whight light-emitting diodes
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Funding
- National Natural Science Foundation of China [11875166, 11435010]
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This study successfully prepared a series of copper-based perovskite micro-phosphors using ethanol as a green solvent. The phosphors exhibited adjustable luminescence peaks and high photoluminescence quantum yield. White-light emission phosphors can also be synthesized by simply adjusting the chemical composition.
Despite the excellent properties of perovskite materials, the strict oxygen-free atmosphere, heating temperature and a large number of toxic solvents applied during preparation obstruct their more widespread applications. Using ethanol as a green anti-solvent to successfully prepare a series of copper-based perovskite micro-phosphors. They have a luminescence peak between 445 nm and 580 nm adjusted with halogen and the high -est PLQY of 81.6%. Moreover, by simply adjusting the molar ratio of CsI to CuI, white-light emission phosphors can be synthesized in one step. It exhibits a Commission Internationale de L'Eclairage (CIE) chromaticity co-ordinates (0.35, 0.35) and a correlated color temperature (CCT) of 4798 K. After two months of storage, there is still 97.4% of the initial light intensity. This technology offers a green and straightforward method for producing perovskite phosphors.
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