Inorganic/organic bilayer--modified CaS:Eu2+,Ce3+ phosphor and luminescent film laminated glass for efficient solar energy utilization

CaS:Eu2+,Ce3+ are widely used in various fields, which is due to their excellent luminescent properties. However, the traditional high-temperature solid state synthesis of CaS has the disadvantage of large particle size and easy agglomeration. Also, the CaS-based material is unstable and decomposes easily in humid air. In the present study, CaS:Eu2+, Ce3+(here denoted as CaS:EuCe) phosphors with a uniform particle size, good dispersion, and small particle size (Dv50 = 13.46 μm, abbreviated as D50) have been obtained using a novel coprecipitation-mesophase decomposition (CMD) method. In addition, the inorganic-organic bilayer modification technology has been used to form core-shell structured CaS:EuCe@CaZnOS@Si69 phosphors, which could resist acidic/basic solutions and moist air. Its surface property changed from hydrophilicity (water contact angle 37.28°) to hydrophobicity (water contact angle 112.23°). Finally, the optimized phosphor was used to prepare luminescent film laminated glass, which showed the potential for use in plant growth. The reaction process of the CaS phosphor, as prepared by the CMD method, and the mechanism of the bilayer surface modification, have here been discussed in detail. We believe that the here-developed synthesis method provides a new strategy for the preparation of high-performance chalcogenide phosphors.