Spray pyrolysis was applied to prepare ZnS:Mn²⁺ yellow nanophosphor. As an increase of pH of spraying solution, the ZnS:Mn²⁺ nanophosphor showed the hexagonal-dominant phase, whereas, as an increase of firing temperature for spray pyrolysis, it showed the cubic-dominant phase. The emission intensity of the ZnS:Mn²⁺ nanophosphor was optimized at the pH of 3.5 and the temperature of 900 ℃. The ZnS:Mn²⁺ nanophosphor showed the broader excitation spectrum but no difference in the emission spectrum in comparison with the microphosphor synthesized by solid-state reaction. The temperature-dependence photoluminescence showed the different spectroscopic behavior from the microphosphor. The time-resolved photoluminescence show slightly longer decay time than the microphosphor. These behaviors can be explained in terms of the interaction of Mn²⁺ state and impurity level of nanophosphor.

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1. Comparative analysis of ZnS:Mn²⁺ nanophosphors prepared by low-temperature precipitation and hydrothermal methods