Photoelectric studies of two-step photoionization of Ti3+ ions in oxide crystals

Autor:	B. K. Sevastyanov, A.A. Kaplyanskii, L. S. Starostina, S.P. Feofilov, M.Yu. Sharonov, S.A. Basun
Rok vydání:	1992
Předmět:	Photocurrent Photoconductivity Biophysics Analytical chemistry Oxide General Chemistry Photoionization Photoelectric effect Condensed Matter Physics Biochemistry Atomic and Molecular Physics and Optics Ion Optical pumping chemistry.chemical_compound chemistry Atomic physics Excitation
Zdroj:	Journal of Luminescence. 53:28-31
ISSN:	0022-2313
DOI:	10.1016/0022-2313(92)90098-t
Popis:	In photoconductivity studies in Al 2 O 3 :Ti 3+ and Y 3 Al 5 O 12 :Ti 3+ (YAG:Ti 3+ ) a nearly quadratic dependence of photocurrent on excitation intensity is experimentally observed. Spectral and kinetics measurements show that the Ti 3+ photoionization under visible and UV excitation in the t → e transition region takes place as a result of a two-step process via the intermediate e state. The experimentally estimated energy between this e level of Ti 3+ and the conduction band bottom is in Al 2 O 3 larger and in YAG smaller than the zero-phonon e-t line (ZPL) energy. This determines the essential difference in persistent hole-burning in the ZPL of Al 2 O 3 :Ti 3+ and YAG:Ti 3+ [1] and in the efficiency of e level optical pumping.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8738c23fa25a597667f2efde9828c7df https://doi.org/10.1016/0022-2313(92)90098-t Zobrazit plný text záznamu