Quenching in Mn4+-Complex Fluoride Phosphors: Initial Relationships Based upon NaKSiF6:Mn4+. (1st January 2020)

• Record Type: Journal Article
• Authors: Setlur, A. A.; Murphy, J. E.; Sista, S. P.
• Is Part Of: ECS journal of solid state science and technology. Volume 9:Number 1(2020)
• Publication Date: 2020-01-01
• Subjects: Displays -- Luminescence -- Mn -- Phosphor -- Quenching; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2.0322001JSS
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : Mn 4+ -doped complex fluoride compositions are an important class of phosphors that provide narrow-band 2 E→ 4 A2 red emission for liquid crystal display (LCD) backlighting and illumination light emitting diodes (LEDs). In this report, we discuss the high temperature quenching in these phosphors, focusing on the NaKSiF6 :Mn 4+ phase that has a lower quenching temperature by >75K versus the two end-member compositions, K2 SiF6 :Mn 4+ and Na2 SiF6 :Mn 4+ . Measurements of the 2 E electron-phonon coupling through line shift versus temperature measurements do not give significant differences between NaKSiF6 :Mn 4+ and other Mn 4+ -doped complex fluoride phosphors with higher quenching temperatures. We tentatively attribute the stronger quenching in NaKSiF6 :Mn 4+ to additional distortion in the excited 4 T2 state that is thermally populated from the 2 E level at high temperatures. In addition, we discuss potential trade-offs between high temperature luminescence quenching and faster 2 E→ 4 A2 emission lifetimes.