Bacce, E. D.Pires, Ana Maria [UNESP]Davolos, Marian Rosaly [UNESP]2014-05-202014-05-202002-10-07Journal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 344, n. 1-2, p. 312-315, 2002.0925-8388http://hdl.handle.net/11449/35983This work reports on the study about the luminescence behavior of Eu3+-O2- associates in Sr2SiO4 doped with Eu3+, or simultaneously doped with Eu3+ and Zn2+ ions, where the Zn2+ doping ion acts as a charge compensating agent. Both Sr2SiO4:Eu3+ and Sr2SiO4:Eu3+,Zn2+ emission spectra show two types D-5(0)-->F-7(0) type transitions, one type related to Eu3+ in the Sr2+ Site, at 577 and 580 nm and the other one related to Eu3+-O2- associates, at 574 nm. Excitation spectra present two CT bands at 275 and 324 nm related to each emission center, respectively. Comparing the relative intensities between the emission spectra, the 0-->0 transition at 574 nm assigned to Eu3+-O2- associates in the Sr2SiO4:Eu3+ emission spectrum is much more intense than the same transition in the Sr2SiO4:Eu3+,Zn2+ emission spectrum. Moreover, in the Sr2SiO4:Eu3+ excitation spectrum, the intensity ratio between the CT band related to the Eu3+-O2- emission center and Eu3+ F-7-->L-5(6) transition is also larger than in the Sr2SiO4:Eu3+,Zn2+ one. Therefore, the presence of Zn2+ species provides an extra charge compensating mechanism, which decreases the formation of Eu3+-O2- associates. (C) 2002 Elsevier B.V. B.V. All rights reserved.312-315engstrontium orthosilicateEu-O associateluminescenceEuZn co-dopingArtigo10.1016/S0925-8388(02)00376-6WOS:000178852200069Acesso restrito4284809342546287