Structure and Host Luminescence of YXO4(X=Nb, V) †

doi:10.7503/cjcu20190352

Abstract

Abstract:

A series of YNb_1-_xO₄∶xV samples were synthesized by high temperature solid phase method. Different structures were obtained by continuously varying the concentrations of Nb and V. It was found that the luminescence of the V$O^{3-}_{4}$ group and the luminescence of the Nb$O^{3-}_{4}$ group are located at around 420 and 400 nm. However, the small amount of V ⁵⁺ doping in YNbO₄ and the small amount of Nb ⁵⁺ doping in YVO₄ have significantly different effects on their luminescent behaviors. By continuously varying the ratio of V and Nb, the luminescent properties do not continuously change from one characteristic luminescence to another, but reach the minimum emission intensity at a certain composition. In this paper, the changes in structure, composition and luminescence were studied. The results show that there are two luminescence quenching mechanisms.

Key words: Yttrium vanadate, Fergusonite, Host emission, Tetrahedral coordination

TrendMD:

Hongjie WANG,Chongyang ZHU,Su ZHANG,Ran PANG,Lihong JIANG,Da LI,Guanyu LIU,Jize CAI,Jing FENG,Chengyu LI. Structure and Host Luminescence of YXO₄(X=Nb, V) ^†[J]. Chem. J. Chinese Universities, 2019, 40(12): 2448.

Figures/Tables 11

Fig.1 Crystal structure diagrams of YVO4(A) and YNbO4(B)

Fig.2 XRD patterns(A) and part enlarged patterns(B) of samples a. JCPDS No.23-1486; b. YNbO4; c. YNb0.98O4:0.02V; d. YNb0.92O4:0.08V; e. YNb0.8O4:0.2V;f. YNb0.6O4:0.4V; g. YNb0.4O4:0.6V; h. YNb0.2O4:0.8V; i. YVO4; j. JCPDS No.17-0341.

Fig.3 XRD patterns of samples a. JCPDS No.23-1486; b. YNb0.05O4:0.95V; c. YNb0.02O4:0.98V; d. YVO4; e. JCPDS No.17-0341.

Fig.4 Raman spectra of YNb1-xO4:xV samples at room temperature a. YVO4; b. YNb0.2O4:0.8V; c. YNb0.4O4:0.6V; d. YNb0.6O4:0.4V; e. YNb0.8O4:0.2V; f. YNb0.85O4:0.15V; g. YNb0.9O4:0.1V; h. YN b 0.9 2 O4:0.08V; i. YN b 0.9 6 O4:0.04V; j. YNb0.98O4:0.02V; k. YNbO4.

Fig.5 Emission spectra of YNb1-xO4:xV excited by 257 nm ultraviolet light at room temperature x: a. 0; b. 0.01; c. 0.02; d. 0.04; e. 0.08; f. 0.1; g. 0.15; h. 0.2; i. 0.4; j. 0.6; k. 0.8; l. 1.

Fig.6 Excitation spectra of YNb1-xO4:xV under 404 nm monitoring conditions at room temperature

Fig.7 Luminescent level diagram of VO4 group in YVO4

Fig.8 Excitation spectra of YNb1-xO4:xV under 429 nm monitoring conditions at room temperature x: a. 0; b. 0.2; c. 0.4; d. 0.6; e. 0.8; f. 1.

Fig.9 Emission spectra of YNb1-xO4:xV under 322 nm ultraviolet light excitation at room temperature x: a. 0; b. 0.2; c. 0.4; d. 0.6; e. 0.8; f. 1.

Fig.10 Curve of peak intensity vs. V5+ concents at room temperature λex/nm: a. 257; b. 322.

Fig.11 Room temperature fluorescence decay curves of YXO4 with different contents

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Structure and Host Luminescence of YXO₄(X=Nb, V) ^†

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