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Abnormal co-doping effect on the red persistent luminescence SrS:Eu2+,RE3+ materials

Abstract

Persistent luminescence materials are a reality in several applications. However, efficient red-emitting materials are still lacking. SrS:Eu2+ phosphor keeps as a potential candidate since its strong nephelauxetic effect shifts Eu2+ 4f65d1→4f7 to red and its weak bond between strontium and sulphide, due to the soft base-hard acid character, generate a high number of intrisic defects. The SrS:Eu2+,RE3+ materials were efficiently prepared by two rounds of 22 min microwave-assisted solid-state synthesis. The highly crystalline purity and the material organization at the micro-scale were observed with X-ray powder diffraction and Scanning Electron Microscopy, respectively. X-ray absorption spectroscopy pointed out a low ammount of Eu2+ compared to Eu3+ due to the efficient Eu2+ photo-oxidation by X-ray irradiation in the high storage capability SrS host matrix. Electron Paramagnetic Ressonance spectra confirmed that at least 50 % of Eu2+ ions in the material are photo-oxidized during excitation, reinforcing previously estabilished mechanisms. The RE2+ energy level positioned very close or into the conduction band led to an abnormal co-doping effect, with similar effect independent on the co-dopant. The high concentration of intrinsic defects in SrS indicates that soft-hard pair hosts is an excellent approach to develop efficient persistent luminescence materials.

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Supplementary files

Article information


Submitted
09 Apr 2020
Accepted
18 May 2020
First published
18 May 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Abnormal co-doping effect on the red persistent luminescence SrS:Eu2+,RE3+ materials

D. O. A. Santos, L. Giordano, M. A. S. G. Barbará, M. C. Portes, C. C. S. Pedroso, V. C. Teixeira, M. Lastusaari and L. C. V. Rodrigues, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT01315C

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