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• W2725614159 abstract "A comparative study of the luminescent properties of SrAl4O7:Eu3+(x%) and SrAl4O7:Eu3+(x%),Na+(x%) (x = 0.002–0.1) phosphor powders as a function of activator concentration is reported. Upon UV excitation both series of compounds exhibit strong characteristic red Eu3+ photoluminescence with a maximum around 611.5 nm, which intensity increases with an increase of activator content. It was found that the luminescence spectra of singly Eu3+ doped strontium aluminate are much more concentration dependent. As the dopant content increases, the spectra of SrAl4O7:Eu3+ show an increased line broadening and the emergence of new emission components. The observed changes in the studied concentration range are due to an increased disorder of Eu3+ local symmetry induced by the increase in the number of defects in host lattice and by the presence of a new crystalline phase that occurs at the higher dopant content. Charge compensation through Na+ co-doping facilitates an incorporation of Eu3+ into the SrAl4O7 lattice and leads to a smaller symmetry disorder of activator surroundings as well as a significantly enhanced Eu3+ luminescence intensity. The largest increase in emission intensity (∼6.5 times) was observed for 7%-doped sample. Concentration dependences of the luminescence kinetics of both types of materials are clearly different. It was found that for singly Eu3+ doped SrAl4O7 the 5D0 lifetime shortens with the increase of activator content from 1.8 to 1.4 ms while for Na+ co-doped SrAl4O7 this value does not vary over a range of concentrations and is approximately 1.8 ms. SrAl4O7:Eu3+,Na+ powders are potential candidates to be used as luminescent materials." @default.
• W2725614159 created "2017-07-14" @default.
• W2725614159 creator A5074645016 @default.
• W2725614159 date "2017-10-01" @default.
• W2725614159 modified "2023-09-27" @default.
• W2725614159 title "High enhancement of Eu3+ luminescence in SrAl4O7 phosphor by means of charge compensation with Na+ ions" @default.
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• W2725614159 doi "https://doi.org/10.1016/j.optmat.2017.05.045" @default.
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