CaMoO<SUB>4</SUB>∶Tb<SUP>3+</SUP>发光材料的制备和发光性质的研究

doi:10.3964/j.issn.1000-0593(2010)01-0022-04

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Abstract The precursor of the sample CaMoO₄∶Tb³⁺ was prepared by the coprecipitation method.TG-DTA spectra show that there is, at 850 ℃, an energy absorption peak, suggesting that the sample reaches the activation spot of its response.The XRD pattern of the roasted sample shows that CaMoO₄∶Tb³⁺, in the single phase, is a representative scheelite structure of CaMoO₄, but the peaks shift toward right, implying that tiny crystal defect in the crystal is produced.The defect is likely to be formed by the formation of the holes as two Tb³⁺ replace three Ca²⁺ in a cell.The excitation and emission spectra of the sample were investigated and revealed that the defect structure of the sample is in favor of the energy transfer of the characteristic peak (488 nm) of the MoO^2-₄ effectively to Tb³⁺, and makes the 4f electrons of the Tb³⁺ transit, especially the ⁷F₆→⁵D₄ electronic transition (488 nm) of the Tb³⁺, to be greatly strengthened.As a result, the emission spectra with λ_ex=488 nm show that the emission intensity of the spontaneously activated fluorescence MoO^2-₄ is greatly weakened, while the green light luminescence intensity of the ⁵D₄→⁷F₅ transition (544 nm) of the Tb³⁺ is greatly enhanced.This suggests that the sample CaMoO₄∶Tb³⁺ will become the luminescence material with potentially great application value.

Key words：CaMoO₄;Tb³⁺;Luminescence properties

Received: 2008-12-20 Accepted: 2009-03-22

ZTFLH:	O613.6
	O614.3

Corresponding Authors: WANG Xi-gui E-mail: 253188525@qq.com; wangxg@imnu.edu.cn

Cite this article:

WANG Xi-gui,BO Su-ling,NA Mi-la, et al. Preparation and Luminescent Properties of CaMoO₄∶Tb³⁺ [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(01): 22-25.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2010)01-0022-04 OR https://www.gpxygpfx.com/EN/Y2010/V30/I01/22