Citation:
	            
		            Li  Bo, Gu  Zhen-Nan, Lin  Jian-Hua, Su  Mian-Zeng. Energy Transfer in the Luminescence Process of YTaO4:Gd,Eu[J]. Acta Physico-Chimica Sinica,
							;1999, 15(09): 794-798.
						
							doi:
								10.3866/PKU.WHXB19990905
						
					
				
					
				
	        
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Yttrium orthotantalate co doped by Eu 3+ and Gd 3+ has been synthesized by solid state method. The emission and excitation spectra of YTaO4: Gd, Eu are studied in detail. In the excitation spectra of Eu 3+5D 0→ 7F2 transition emission in YTaO4:Gd, Eu, there appear excitations of Gd3+ and TaO43- group, which indicate energy transfer from Gd 3+ and TaO4 3- group to Eu 3+ in the process of luminescence. The excitation spectra of Gd 3+ emission(λ=312 5 nm) including strong excitation of charge transfer of group show energy transfer from host lattice to Gd 3+ . So there are two ways of energy transfer in YTaO4:Gd,Eu system. The strong evidences from excitation spectra, emission spectra and diffusive reflection spectra of this system show that Gd 3+ can play an intermediate role in the process of luminescence. There is energy transfer from TaO 3- 4 to Gd 3+ and finally to Eu 3+ via the charge transfer state and spectral overlap. The energy transfer from TaO 3- 4 to Gd 3+ is a dominating process in this system.
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								Keywords:
								
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Luminescence
, - Tantalate,
 - Rare earth
 
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