A green approach to green-conversion material and green-agriculture: alkaline-earth metal sulfide phosphors

Abstract

In this paper, a novel intermediate phase transition metathesis strategy is adopted to prepare Eu²⁺-doped CaS-based materials on the basis of green chemistry. ZnS acts as a vulcanizing agent and contributes to the formation of CaS from CaO through thermal decomposition of an intermediate state of CaZnOS. The recycling of zinc content is realized by collections of zinc evaporation during the process at high temperature. Few atoms would be wasted and no hazardous auxiliaries are used or produced. Meanwhile, solid solubilities of Mg, Sr and Ba in the CaS compound are verified quite different from the previous results in this case. The effect of Sr/Ca ratios on the luminescence properties of (Ca,Sr)S:Eu²⁺ phosphors is also investigated. A solar energy conversion laminated glass is promoted to overcome the drawback of decomposition of phosphors to moisture and recycling of agriculture films, which provides a promising permanent functional green-to-red sunlight spectrum conversion greenhouse device for green agriculture.