title: [Concentration dependence of luminescence under different excitation wavelength in Y2O2S:Sm3+ phosphor].
abstract: The concentration dependence of luminescence under different excitations in Y2O2S:Sm3+ phosphor has been studied. The optimum activator concentration was found to be a function of the number of excited activator ions as well as the excitation wavelength. The concentration dependence curve of Y2O2S:Sm3+ phosphor under 413 nm excitation was different from the curve obtained with 263 nm excitation. For excitation radiation having longer wavelength (413 nm), the concentration quenching of Y2O2S:Sm3+ phosphor occurred at about 2%, which is ten times the result with shorter wavelength (263 nm) excitation (-0.2%). Fitting the concentration dependence curve and the result shows that the cross-relaxation caused by the dipole-quadrupole interaction of neighboring Sm3+ ions results in the concentration quenching.
authors.affiliation: Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Bing-fu
authors.initials: BF
authors.lastname: Lei
authors.forename: Ying-liang
authors.initials: YL
authors.lastname: Liu
authors.forename: Gong-ben
authors.initials: GB
authors.lastname: Tang
authors.forename: Ze-ren
authors.initials: ZR
authors.lastname: Ye
authors.forename: Chun-shan
authors.initials: CS
authors.lastname: Shi