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Indexed by:期刊论文

Date of Publication:2011-01-01

Journal:CHINESE PHYSICS B

Included Journals:SCIE、EI、ISTIC、Scopus

Volume:20

Issue:1

ISSN No.:1674-1056

Key Words:Nd3+:Er3+:Yb3+ co-doped borosilicate glasses; optical parameters; photoluminescence characteristics; high temperature

Abstract:This paper reports that a series of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses have been prepared and their absorption spectra measured. The J-O intensity parameters Omega(k) (k = 2, 4, 6), spontaneous radiative lifetime tau(rad), spontaneous transition probability A, fluorescence branching ratio beta and oscillator strength integral(ed) of the Nd3+ ions at room temperature are calculated based on Judd Ofelt (J O) theory. The temperature dependence of the up-conversion photoluminescence characteristics in a Nd3+:Er3+:Yb3+ co-doped sample is studied under a 978 nm semiconductor laser excitation, and the energy transfer mechanisms among Yb3+, Er3+ and Nd3+ ions are analysed. The results show that the J-O intensity parameters Omega(2) increase when the Nd3+ concentration of the Nd3+:Er3+:Yb3+ co-doped borosilicate glasses increases. The possibility of spontaneous transition is small and lifetimes are long at levels of F-4(5/2) and F-4(3/2). The intensity of Nd3+ emissions at 595, 691, 753, 813 and 887 nm are markedly enhanced when the sample temperature exceeds 400 K. The reasons being the cooperation of the secondary sensitization from Er3+ to Nd3+ and the contribution of a multi-phonon.