Rare-earth fluorescence in novel oxyfluoride glasses and glass-ceramics

15 April 1998

proceedings article
Published by SPIE-Intl Soc Optical Eng

p. 132-137
https://doi.org/10.1117/12.305402

Abstract

Transparent oxyfluoride glass-ceramics can provide a low- phonon energy fluoride environment for active rare earth ions while maintaining the durability, formability, and mechanical strength of an oxide glass. Fluorescence from RE doped samples indicate substantial partitioning into the fluoride crystals. Eu³⁺ doped glasses emit only red luminescence from the ⁵D₀, but after treatment emit blue, green, and red luminescence, indicative of a low phonon energy rare earth environment. Er³⁺ doped samples show broadening and flattening of the 1530 emission band upon heat treatment, making them attractive for broad band amplifiers. Cerammed Pr³⁺ doped samples exhibit 240 microsecond(s) ¹G₄ fluorescent lifetimes, which indicates a 1310 nm quantum efficiency of 8%. It was determined that active rare earth partitioning into the LaF₃ nanocrystallites that form upon heat treatment are responsible for the novel optical properties of these hybrid materials.

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