Facile synthesis, morphology and photoluminescence of a novel red fluoride nanophosphor K2NaAlF6:Mn4+. Issue 26 (23rd May 2017)

• Record Type: Journal Article
• Authors: Zhu, Yiwen; Cao, Luyu; Brik, Mikhail G.; Zhang, Xuejie; Huang, Lin; Xuan, Tongtong; Wang, Jing
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 26(2017)
• Page Start: 6420
• Page End: 6426
• Publication Date: 2017-05-23
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc01074e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A novel red-emitting fluoride phosphor, K2 NaAlF6 :Mn 4+, with nanoscale particle size was synthesized via a cation exchange route. Abstract : A novel red-emitting fluoride phosphor, K2 NaAlF6 :Mn 4+, with nanoscale particle size was synthesized via a cation exchange route. This phosphor absorbs UV and blue light and emits red light at about 630 nm; thus, it has been regarded as an ideal red phosphor for WLEDs. The reaction parameters were systematically investigated and an optimized sample was obtained. K2 NaAlF6 :Mn 4+ showed better photoluminescence properties and its emission wavelength was blue shifted with respect to that of K2 LiAlF6 :Mn 4+ due to differences in the neighbouring alkali metal ions and different distances between the cation and the ligands. These results are in agreement with the trend determined by the recently introduced parameter β 1, which describes the energy of the 2 Eg → 4 A2g transition as a function of the nephelauxetic effect. Finally, these results could further contribute to the optimization of red-emitting phosphors based on Mn 4+ ions.