A bridge role of Tb3 + in broadband excited Sr3Y(PO4)3:Ce3 +, Tb3 +, Sm3 + phosphors with superior thermal stability. (15th March 2017)

• Record Type: Journal Article
• Authors: Leng, Zhihua; Li, Liping; Che, Xiangli; Li, Guangshe
• Is Part Of: Materials & design. Volume 118(2017)
• Page Start: 245
• Page End: 255
• Publication Date: 2017-03-15
• Subjects: Metal-metal charge transfer quenching -- Energy transfer -- Tunable photoluminescence -- Thermal stability; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.01.038
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: In this work, we report on a comprehensive study about the bridge role of Tb 3 + in broadband excited Sr3 Y(PO4 )3 :Ce 3 +, Tb 3 +, Sm 3 + phosphors. With Tb 3 + acting as an energy transfer bridge, Ce 3 + → (Tb 3 + )n → Sm 3 + energy transfer process was utilized to circumvent Ce 3 + -Sm 3 + metal-metal charge transfer (MMCT) quenching in Sr3 Y(PO4 )3 host. Sm 3 + was efficiently sensitized by the broad absorption band (4f 1 → 5d 1 transition) of Ce 3 + in near-ultraviolet spectral region. The color tones of Sr3 Y(PO4 )3 :Ce 3 +, yTb 3 +, zSm 3 + phosphors were tuned from blue through green and finally to orange with increasing Tb 3 + /Sm 3 + doping concentration. Furthermore, energy transfer mechanisms from Ce 3 + to Tb 3 + (dipole-dipole mechanism) and Tb 3 + to Sm 3 + (exchange interaction) as well as the corresponding energy transfer efficiencies (higher than 90%) are systematically investigated. Sr3 Y(PO4 )3 :0.02Ce 3 +, 0.90Tb 3 +, 0.02Sm 3 + phosphor shows a thermal stability up to 493 K, superior to that in analogous reports. The quantum efficiency of Sr3 Y(PO4 )3 :0.02Ce 3 +, 0.90Tb 3 +, 0.02Sm 3 + phosphor with 315 nm excitation was calculated to be 60%. Graphical abstract: High doping concentration of Tb 3 + suppresses Ce 3 + -Sm 3 + metal-metal charge transfer quenching in Sr3 Y(PO4 )3 :Ce 3 + /Tb 3 + /Sm 3 + phosphors, which show a superior thermal stability up to 493K. Highlights: High doping concentration of Tb 3 + suppresses Ce 3 + -Sm 3 + metal-metal charge transfer quenching in Sr3 Y(PO4 )3 host. The energy transfer mechanisms and efficiencies were uncovered through a systematic investigation. The phosphor showed a superior thermal stability up to 493K, at which photoluminescence intensity still remained at 85.3%.