Nobuo Nakajima et al 2009 J. Phys.: Conf. Ser. 190 012083 doi:10.1088/1742-6596/190/1/012083
Nobuo Nakajima1, Masataka Deguchi1, Naoki Ishimatsu1, Hiroshi Maruyama1, Kotaro Ishiji2 and Toshiaki Iwazumi3
Show affiliationsThe UV irradiation effect in the practical luminescence material (Pr, Al)-doped SrTiO3 was investigated by x-ray absorption spectroscopy at the Ti K-edge. Two characteristic peaks observed in difference spectra between UV off- and on-spectra show different UV energy dependence; above the common onset UV energy of ~3.3 eV, which is nearly equal to the band-gap energy, a difference peak at the main absorption edge changes its intensity in accordance with the photoluminescence excitation spectrum, while another difference peak in the pre-edge region does not. Through the consideration of the energy scheme, the Ti 3d conduction-band bottom is responsible for the pre-edge features and is rather insensitive to UV energy, whereas the main edge together with other features in the higher-energy region is attributable to the upper-lying 4p states that are strongly influenced by UV light via valence holes. These results enable us to propose a mechanism of UV absorption followed by visible light emission.
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
77.80.-e Ferroelectricity and antiferroelectricity
78.70.Dm X-ray absorption spectra
78.55.Hx Other solid inorganic materials
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
Issue 1 (2009)
Nobuo Nakajima et al 2009 J. Phys.: Conf. Ser. 190 012083
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