A simple way to prepare a hydrophobic Sr[LiAl3N4]:Eu2+ phosphor with improved moisture resistance. (September 2018)

• Record Type: Journal Article
• Authors: Zhong, Hao; Wang, Jun-Wei; Dong, Bin-Bin; Li, Lin; Yang, Ming-Ye; Yu, Jun-Ling; Xin, Xu; Agathopoulos, Simeon
• Is Part Of: Materials research bulletin. Volume 105(2018)
• Page Start: 260
• Page End: 264
• Publication Date: 2018-09
• Subjects: A. Optical materials -- B. Optical properties -- C. Transmission electron microscopy (TEM) -- D. Surface properties -- D. Phosphors; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.05.009
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: A simple modification method to transform SrLiAl3 N4 :Eu 2+ into hydrophobic phosphor. A thin organosilica layer (about 5–10 nm) was coated on the surface of SLA phosphor. The modified phosphor features superior stability under extremely environment. Abstract: The red-emitting Sr[LiAl3 N4 ]:Eu 2+ (SLA) phosphor was synthesized under flowing N2 gas. A thin organosilica layer (about 5–10 nm) was coated on the surface of SLA phosphors by a very simple method, which transformed the phosphor surface from hydrophilicity to hydrophobicity. The contact angle of water droplets on the surface of the packed SLA phosphors was more than 140°. Compared with the unmodified sample, the modified SLA phosphors could keep at a high emission intensity for more than twice the time under an extremely high moisture level (at relative humidity of 100%, 85 °C). The hydrophobic modification could also improve the uniform dispersion of phosphors during assembly process of white LED.