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Core–shell structured CaS:Eu2+@CaZnOS via inward erosion growth to realize a super stable chalcogenide red phosphor

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Abstract

With outstanding green-to-red spectral conversion ability, CaS:Eu2+ is notorious for its poor chemical and thermal stabilities, which seriously limit its practical applications. Herein, we structure core–shell CaS:Eu2+@CaZnOS phosphors by a convenient solid-state method. The oxysulfide protection layer was formed due to inward incorporation of ZnO into the surface lattice of the CaS substrate. As a result, the surface modified chalcogenide red phosphor shows super stability toward acidic/basic solutions and retains its brightly emissive activity in aqueous solutions with pH = 1–14. Moreover, it exhibits the best thermal resistance behavior for alkaline earth sulfide-based phosphors up to now, maintaining over 95% of the emission intensity till 150 °C. In addition, the QE of the optimal core–shell phosphor in the green region reached 68.78%, which is elevated by ∼23% compared to that of the starting CaS:Eu2+. This is the first time to simultaneously realize a chemically and thermally stable sulfide phosphor, along with high QE, which exhibits good suitability for solar spectral conversion films and light-emitting diodes for facilitating plant growth.

Graphical abstract: Core–shell structured CaS:Eu2+@CaZnOS via inward erosion growth to realize a super stable chalcogenide red phosphor

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Publication details

The article was received on 01 Mar 2019, accepted on 26 Mar 2019 and first published on 27 Mar 2019


Article type: Paper
DOI: 10.1039/C9TC01167F
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Core–shell structured CaS:Eu2+@CaZnOS via inward erosion growth to realize a super stable chalcogenide red phosphor

    X. Wang, Z. Qiu, Y. Li, Q. Mi, W. Zhou, S. Ai, J. Xu, Y. Liu and S. Lian, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC01167F

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