ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A series of Eu3+ doped M and M′ type gadolinium orthotantalate Gd1− xEuxTaO4 (x = 0–0.20) have been synthesized by high temperature solid state reaction. The emission and excitation spectra for M and M′ type gadolinium orthotantalate are studied in detail. The structural difference between M and M′ type structure obviously influences their luminescence properties. The main excitation bands in M′ type Gd1− xEuxTaO4 shift to shorter wavelength because of a shorter distance of Ta-O in comparison with M type. The strong evidence from excitation spectra, emission spectra and diffusive reflection spectra of these two system show Gd3+ can play an intermediate role of energy transfer in the process of luminescence. There is energy transfer from TaO4 3− to Gd3+ and finally to Eu3+ via the charge transfer states and spectral overlap.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004767916006
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