Glasses are essential materials with a multitude of uses and many forms. In the area of optoelectronics there is an interest to modify the glass compostion to favor the incorporation of lanthanide elements. Their stability and luminescence properites give the opportunity to fabricate optical materials, such as broadband amplifies, lasers and non linear optical devices. A principal area of interest is that of telecommunications. Addition of heavey metal oxides assist in structral change swithn in the host of glass for lanthanide incorporation, as well as expressing low phonon energies. Howerever changes in composition and structure can influence the lanthanide emission and time-resolved spectroscopic methods are well suited to investigate this.
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