Optical properties of Pr^3＋ doped in Y2SiO5, including absorption spectra, emission spectra, and fluorescence decay, have been investigated with a special attention in the UV region. Broad band （270-350nm） UV fluor...Optical properties of Pr^3＋ doped in Y2SiO5, including absorption spectra, emission spectra, and fluorescence decay, have been investigated with a special attention in the UV region. Broad band （270-350nm） UV fluorescence assigned to the transitions 4f5d → 4f^2 ^3Hj, ^3Fj is found. The spontaneous transition probabilities in the 4f^2 intraconfiguration are calculated by utilizing the 3udd-Ofelt theory, by which three phenomenological parameters （Ω2, Ω4, Ω6,） are obtained by fitting the absorption spectra. For the evaluation of transition probability of the interconfiguration 4f5d → 4f^2, a formula for electric dipole transition is employed. In comparison of the measured fluorescence lifetime with the calculated spontaneous radiative lifetime, the fluorescence quantum efficiency is deduced.展开更多
Radiative lifetimes of two short-lived levels （i.e. 4f^8 （TF6）6p^1/2 （6, 1/2）11/2,13/2） in Tb Ⅲ are measured by time-resolved laser-induced fluorescence （LIE） technique with a two-step excitation process. Fre...Radiative lifetimes of two short-lived levels （i.e. 4f^8 （TF6）6p^1/2 （6, 1/2）11/2,13/2） in Tb Ⅲ are measured by time-resolved laser-induced fluorescence （LIE） technique with a two-step excitation process. Free Tb Ⅲ ions are produced in a laser-induced plasma. Lifetime values are evaluated with a deconvolution procedure of the timeresolved fluorescence signal with the temporal shape of second-step excitation pulse （about 1 ns）. The lifetimes of the 4f^8 （^7F6）6p^1/2 （6, 1/2）11/2 and 4f^8（^7F6）6p^1/2 （6, 1/2）13/2 levels are determined to be 1.9 （2） and 2.0 （2）ns, respectively.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10074020.
文摘Optical properties of Pr^3＋ doped in Y2SiO5, including absorption spectra, emission spectra, and fluorescence decay, have been investigated with a special attention in the UV region. Broad band （270-350nm） UV fluorescence assigned to the transitions 4f5d → 4f^2 ^3Hj, ^3Fj is found. The spontaneous transition probabilities in the 4f^2 intraconfiguration are calculated by utilizing the 3udd-Ofelt theory, by which three phenomenological parameters （Ω2, Ω4, Ω6,） are obtained by fitting the absorption spectra. For the evaluation of transition probability of the interconfiguration 4f5d → 4f^2, a formula for electric dipole transition is employed. In comparison of the measured fluorescence lifetime with the calculated spontaneous radiative lifetime, the fluorescence quantum efficiency is deduced.
基金Supported by the Swedish Natural Science Research Council and the National Natural Science Foundation of China under No 10274025.
文摘Radiative lifetimes of two short-lived levels （i.e. 4f^8 （TF6）6p^1/2 （6, 1/2）11/2,13/2） in Tb Ⅲ are measured by time-resolved laser-induced fluorescence （LIE） technique with a two-step excitation process. Free Tb Ⅲ ions are produced in a laser-induced plasma. Lifetime values are evaluated with a deconvolution procedure of the timeresolved fluorescence signal with the temporal shape of second-step excitation pulse （about 1 ns）. The lifetimes of the 4f^8 （^7F6）6p^1/2 （6, 1/2）11/2 and 4f^8（^7F6）6p^1/2 （6, 1/2）13/2 levels are determined to be 1.9 （2） and 2.0 （2）ns, respectively.
