Crystal field modulation-control, bandgap engineering and shallow/deep traps tailoring-guided design of a color-tunable long-persistent phosphor (Ca, Sr)Ga4O7:Mn2+, Bi3+  1. Issue 1 (5th December 2018)

• Record Type: Journal Article
• Authors: Zheng, Weixin; Wu, Haoyi; Ju, Guifang; Mo, Zhong; Dong, Huafeng; Hu, Yihua; Jin, Yahong
• Is Part Of: Dalton transactions. Volume 48:Issue 1(2018)
• Page Start: 253
• Page End: 265
• Publication Date: 2018-12-05
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt03566k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A color-tunable long-persistent phosphor (Ca, Sr)Ga4 O7 :Mn 2+, Bi 3+ based on crystal field modulation, bandgap engineering and traps tailoring. Abstract : In this paper, a new color tunable long persistent phosphor (Ca, Sr)Ga4 O7 :Mn 2+, Bi 3+ has been successfully synthesized via a high-temperature solid-state reaction. Crystal field modulation and band gap engineering controlled by Sr 2+ substitution for Ca 2+ realizes the color tunable Mn 2+ emission from 580 to 556 nm. Guided by the tailoring of traps distribution, the long persistence luminescence (LPL) performance of CaGa4 O7 :Mn 2+ is greatly enhanced to 33 times higher brightness and much longer persistent time through Bi 3+ co-doping. Furthermore, aided by the Rietveld refinement method, steady/transient-state fluorescence and thermoluminescence (TL) techniques with the combination of DFT calculations, the crystal structure evolution, electronic structure, trap distribution tailoring, self reduction of Mn 4+, and the related color tunable Mn 2+ photoluminescence/enhanced LPL properties are systematically characterized. Finally, a schematic diagram is proposed for a detailed illustration of the photoluminescence and LPL mechanisms.