Enhanced Red Emission in Lithium Doped CaWO4:Eu3+ and CaMoO4:Eu3+ Phosphor


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The lithium ions doped red-emitting phosphors of (Ca,Eu)WO4 and (Ca,Eu)MoO4 were synthesized by solid-state reaction method, and their luminescent properties were investigated. The XRD patterns show that the phosphors are isostructural and share a tetragonal scheelite structure, even some lithium ions are doped. The excitation spectra consist of broad charge transfer bands in the short-wave UV region of W6+→O2- and Eu3+→O2- with three sharp lines around 395, 465 and 535 nm of the Eu3+ 4f excitation transitions. The characteristic emissions of WO4 2- and MoO4 2- are quenched absolutely and red light emission of Eu3+ exhibits predominate peak around 615 nm due to the electric dipole energy transition of 5D0→7F2. Excited with 395 nm, the evident enhanced emission of the phosphors were observed when Li+ doped in the host, which implies that the addition of some Li+ is beneficial for the energy transfer from WO4 2- or MoO4 2- to Eu3+.



Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




S. K. Shi et al., "Enhanced Red Emission in Lithium Doped CaWO4:Eu3+ and CaMoO4:Eu3+ Phosphor", Materials Science Forum, Vols. 561-565, pp. 1081-1084, 2007

Online since:

October 2007





[1] S. Nakamura, T. Mukai, M. Sench: Appl. Phys. Lett. Vol. 64 (1994), p.1689.

[2] S. Dalmasso, B. Damilano and C. Pernot: Phys. Status Solidi A. Vol. 192 (2002), p.139.

[3] J. H. Yum, S. Y. Seo and S. Lee: J. Electrochem. Soc. Vol. 150 (2003), p. H47.

[4] M. J. Treadaway, R. C. Powell: J. Chem. Phys. Vol. 61 (1974), p.4003.

[5] J. K. Tyminski, C. M. Lawson and R. C. Powell: J. Chem. Phys. Vol. 77 (1982), p.4318.

[6] Y. S. Hu, W. D. Zhuang and H.Q. Ye: J. Alloys Compd. Vol. 390 (2005), p.226.

[7] J.G. Wang, X. P. Jing and C. H. Yan: J. Electrochem. Soc. Vol. 153 (2005), p. G186.

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