Improving moisture stability of SrLiAl ₃ N ₄ :Eu ²⁺ through phosphor-in-glass approach to realize its application in plant growing LED device

Herein, we present a simple strategy to enhance the stability of water-sensitive SrLiAl ₃ N ₄ :Eu ²⁺ phosphor through embedding the phosphor particles into low-melting Sn-P-F-O glass using phosphor-in-glass (PiG) approach. After being immersed in water for 96 h, the emission intensity of the SrLiAl ₃ N ₄ :Eu ²⁺ -PiG sample was maintained at 80% of its pristine intensity, indicating the moisture-resistance property of SrLiAl ₃ N ₄ :Eu ²⁺ was significantly enhanced. Employing the narrow-band red-emitting SrLiAl ₃ N ₄ :Eu ²⁺ -PiG sample and a blue COB (chip-on-board), a plant growing LED device was fabricated. The emission spectrum of the device matches well with the absorption of Chlorophyl (a and b) in plants, indicating the as-prepared SrLiAl ₃ N ₄ :Eu ²⁺ -PiG are suitable to be applied in plant lighting field. We believe that this simple method reported in this communication can be easily expanded to other water-sensitive luminescence materials.