Journal Articles - Natural Science - 2022

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Influence of F− on the reduction process of Eu3+ to Eu2+ and optical properties of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses

( 2022)
Ho Kim Dan
;
Nguyen Dinh Trung
;
T.H. Le
;
Nguyen Le Thai
;
Nguyen Minh Ty
;
Dacheng Zhou
;
Jianbei Qiu

In this paper, we report the influences of F− ions on the reduction process of Eu3+ to Eu2+, and the optical properties of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses. The visible (VIS), upconversion (UC) emissions, and energy transfer (ET) of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses under the excitations of 295, 335 nm, and 980 nm laser diode (LD) were investigated. The direct/indirect optical bandgaps and CIE 1931 (x; y) chromaticity coordinates for luminescence of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses under the excitations of 295, 335 nm were also been calculated and identified. Remarkably, the influences of F− ions and experimental conditions platinum crucibles with the lid on enhancing the reduction process of Eu3+ to Eu2+were also investigated and discussed.