Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-01-01

Journal: CHINESE PHYSICS B

Included Journals: Scopus、ISTIC、EI、SCIE

Volume: 20

Issue: 1

ISSN: 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.