Hydrothermal synthesis, morphology and photoluminescent properties of an Mn4+-doped novel red fluoride phosphor elpasolite K2LiAlF6. Issue 24 (26th May 2016)

• Record Type: Journal Article
• Authors: Zhu, Yiwen; Huang, Lin; Zou, Rui; Zhang, Jinhui; Yu, Jinbo; Wu, Mingmei; Wang, Jing; Su, Qiang
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 24(2016)
• Page Start: 5690
• Page End: 5695
• Publication Date: 2016-05-26
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc01366j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A novel red emitting fluoride phosphor, K2 LiAlF6 :Mn 4+, with an excellent thermal quenching behavior and color stability for white LEDs is developed by a green synthetic route based on low-toxic H3 PO4 /KHF2 liquid instead of the highly toxic HF liquid. Abstract : Presently, new red emitting Mn 4+ activated fluoride phosphors that are obtained via green synthetic routes remain a great challenge in the field of luminescent materials for advanced applications in solid state lighting and displays. In this study, for the first time, we develop a novel red emitting fluoride phosphor, K2 LiAlF6 :Mn 4+, and it is synthesized in low-toxic H3 PO4 /KHF2 liquid instead of the highly toxic HF liquid, which is a necessity in the synthesis of fluoride phosphors. Moreover, the morphology and photoluminescence properties of K2 LiAlF6 :Mn 4+ were systematically investigated. The results show that the Mn 4+ ion exhibits a broadband excitation extending from 300 to 500 nm, which matches well with UV and blue LED chips and obtains an ideal red emission at 635 nm, due to the similarities in cation site symmetry and host iconicity between the famous K2 TiF6 and target K2 LiAlF6 . Moreover, K2 LiAlF6 :Mn 4+ has an excellent thermal quenching behavior and color stability in the temperature range of 300–500 K, compared with the commercial red nitride phosphor (Sr)CaAlSiN3 :Eu 2+ .