Fluorescence properties of divalent and trivalent europium ions in CdWO4 single crystals grown by Bridgman method

doi:10.1088/1674-1056/22/2/027804

Abstract Optical absorption, excitation, and fluorescence were investigated in Eu ion-doped CdWO₄ single crystal grown by a modified Bridgman method. The results indicate that Eu²⁺ and Eu³⁺ ions coexist in CdWO₄ crystal and an energy transfer occurs between these Eu²⁺ and Eu³⁺ ions. When the crystal is excited by 266-nm light, the energy corresponding to the 4f⁶5d to ⁸S_7/2 transition of Eu²⁺ ions results in the excitation of the Eu³⁺ ions to the ⁵D_J level. The effect on fluorescence of annealing in oxygen at various temperatures was investigated. The excitation intensity of Eu²⁺ ions at 266 nm decreases as annealing temperature increases from 300 K to 1073 K, but it remains at a certain equilibrium level when the annealing temperature is further increased.

Keywords: Eu²⁺ ion optical spectra cadmium tungstate Bridgman method

Received: 19 June 2012
Revised: 30 July 2012
Accepted manuscript online:

PACS:	78.55.Hx	(Other solid inorganic materials)
	78.60.Lc	(Optically stimulated luminescence)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50972061, 51272109, and 21171102); the Natural Science Foundation of Zhejiang Province of China (Grant Nos. R4100364 and Z4110072); the Natural Science Foundation of Ningbo city (Grant No. 2012A610115); and K. C. Wong Magna Fund in Ningbo University.

Corresponding Authors: Xia Hai-Ping
E-mail: xiahaiping@nbu.edu.cn

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Hu Hao-Yang (胡皓阳), Xia Hai-Ping (夏海平), Hu Jian-Xu (胡建旭), Zhang Yue-Pin (张约品), Jiang Hao-Chuan (江浩川), Chen Hong-Bing (陈红兵) Fluorescence properties of divalent and trivalent europium ions in CdWO₄ single crystals grown by Bridgman method 2013 Chin. Phys. B 22 027804

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Fluorescence properties of divalent and trivalent europium ions in CdWO4 single crystals grown by Bridgman method

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Fluorescence properties of divalent and trivalent europium ions in CdWO₄ single crystals grown by Bridgman method