Green anti-solvent processed white light emitting perovskite phosphors in one step

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 highest 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 coordinates (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.