Enhanced 1.47 mu m emission from Tm3+ ions in rare-earth co-doped oxyfluoride glass-ceramics

摘要

In this work, optical properties of Tm3+ ion doped oxyfluoride glasses and glass-ceramics were investigated. Both X-ray diffraction patterns and absorption spectra confirmed that the formation of Tm3+ ion doped fluoride nanocrystals was precipitated in the glass-ceramics with the Y3+ ions as the nucleation agents. For the Tm3+/Y3+ co-doped specimens, effective concentration of Tm3+ ions in the fluoride nanocrystals was reduced and the cross relaxation H-3(4)-H-3(6) -> F-3(4)+F-3(4) process was significantly suppressed. As a result, S-band emission at 1.47 mu m was greatly enhanced. Additional doping of these specimens with Eu3+ and Tb3+ ions led to the depopulation of Tm3+:F-3(4) level, and resulted in further enhanced 1.47 mu m emission from Tm3+: H-3(4) level. (C) 2015 Elsevier B.V. All rights reserved.