CaS:Eu2+@CaZnOS:Mn2+: A dual-UV/green-excited and dual-red-emitting spectral conversion with all-weather resistance. Issue 7 (May 2020)

• Record Type: Journal Article
• Authors: Wang, Xiaofang; He, Jiali; Qiu, Zhongxian; Mi, Qinghua; Xu, Jing; Ai, Shiyun; Zhou, Wenli; Liu, Yongfu; Lian, Shixun
• Is Part Of: Ceramics international. Volume 46:Issue 7(2020)
• Page Start: 9734
• Page End: 9740
• Publication Date: 2020-05
• Subjects: Solar spectral conversion -- Alkaline earth sulfide -- Red phosphor -- Plant cultivation -- Artificial light -- Surface coating; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.12.242
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To pursue green ecological agriculture, long-life functionalized green house is looking for solar spectrum conversions with well spectral match, outstanding thermal and chemical stabilities, excellent anti-photobleaching and UV-conversion performance. CaS:Eu 2+ -based phosphors are widely known as a candidate for agricultural films with remarkable green-to-red conversion performance while they are also notorious for poor stabilities. In this work, a core-shell structured CaS:Eu 2+ @CaZnOS:Mn 2+ composite phosphor was synthesized by a two-step solid state method. The coating layer of thermally and chemically inert oxysulfide prevents the sulfide core phosphor from hydrophilic, air-sensitive and heat-induced decompositions. Moreover, the addition of Mn 2+ in CaZnOS shell qualifies the composite phosphor with strong UV absorption, which contributes to the improvement of the anti-photodegradation of the inner CaS:Eu 2+ and the anti-aging of practical polymer films. The additional UV-to-orange red conversion resulting from CaZnOS:Mn 2+ further extends the red components for the indoor plants. As a result, this dual UV/green excited and dual red-emitting super stable chalcogenide phosphor can be used as a general spectral conversion for plant cultivation. Graphical abstract: A chemical surface coating technique and co-doping strategy establish core-shell typed chalcogenide material CaS:Eu 2+ @CaZnOS:Mn 2+ . The dual-UV/green-excited and dual-red-emitting spectral conversion performance and the full-weather resistance qualify the red phosphor with great potential as a sunlight spectral conversion in long-life agricultural films. Image 1