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Quantitative analysis of UV excitation bands for red emissions in Pr3+-doped CaTiO3, SrTiO3 and BaTiO3 phosphors by peak fitting

Authors :
Hiroyuki Sano
Makoto Kuwabara
Mikio Shimizu
Rei Fujiwara
Source :
Journal of Luminescence. 129:231-237
Publication Year :
2009
Publisher :
Elsevier BV, 2009.

Abstract

A quantitative spectral analysis of the ultraviolet (UV) broad excitation bands, which are located in the range 300–400 nm, for red emissions at around 610 nm in Pr-doped CaTiO3, SrTiO3:Al and BaTiO3:Mg phosphors has been carried out using a peak fitting technique. The obtained results demonstrate that the UV broad band of CaTiO3:Pr consists of four primary excitation bands centered around 330, 335, 365 and 380 nm and those of both SrTiO3:Al and BaTiO3:Mg consist of three primary bands centered around 310, 345 and 370 nm. Based on the behavior patterns and the values of the respective primary excitation bands’ parameters, i.e. center gravity (λtop), maximum height (Imax) and full-width at half-maximum (FWHM), the UV-to-red relaxation processes in these titanate phosphors can be explained to be essentially the same, except for the existence of an additional relaxation pathway via electron-trap states in CaTiO3:Pr, which gives a characteristic shape of its UV excitation spectrum in the wavelength range of >360 nm.

Details

ISSN :
00222313
Volume :
129
Database :
OpenAIRE
Journal :
Journal of Luminescence
Accession number :
edsair.doi...........3e1f4b1264b0d1775a3cb769808ff655
Full Text :
https://doi.org/10.1016/j.jlumin.2008.09.009