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Uniform CaWO4:Ln (Ln = Eu3+, Dy3+) phosphors: solvothermal synthesis and luminescent properties

W. WANG1, W. PAN2, Y. DAI1, S. GAI1, P. YANG1,*

Affiliation

  1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
  2. College of Chemical Engineering and Food, Zhongzhou University , Zhengzhou 450044, China

Abstract

Uniform CaWO4:Ln (Ln = Eu3+, Dy3+) phosphors were successfully synthesized via the micro-emulsion mediated solvothermal process. The as-synthesized samples were well characterized by XRD, FESEM, TEM, XPS, photoluminescence (PL) spectra, and the kinetic decays, respectively. It is found that the as-synthesized phosphors are of high crystallinity and purity with regular octahedral morphology. Upon excitation by ultraviolet radiation, the CaWO4:Eu3+ phosphors show the characteristic 5D0– 7F1-4 emission lines of Eu3+, while the CaWO4:Dy3+ exhibits the characteristic 4F9/2–6H13/2–15/2 emission lines of Dy3+. It should be noted the PL intensities of the phosphors can be tuned by altering the doping concentration of Eu3+ and Dy3+..

Keywords

Solvothermal method, Luminescence, CaWO4, Microemulsion.

Citation

W. WANG, W. PAN, Y. DAI, S. GAI, P. YANG, Uniform CaWO4:Ln (Ln = Eu3+, Dy3+) phosphors: solvothermal synthesis and luminescent properties, Optoelectronics and Advanced Materials - Rapid Communications, 4, 8, August 2010, pp.1078-1082 (2010).

Submitted at: July 30, 2010

Accepted at: Aug. 12, 2010