Abstract
The synthesis and luminescence properties of various kind of rare earth borate glass were studied. These glasses were obtained by melting the mixture of H 3BO 3, ZnO and R 2O 3 (where R is rare earth) at 1150–1250°C for 2–3 hours. There are eight rare earth ions: Ce 3+, Pr 3+, Sm 3+, Eu 3+, Tb 3+, Dy 3+, Er 3+ and Tm 3+ which give emission in the visible region of spectrum. The non-radiative transition probability and quantum efficiency were estimated from the measured decay times. The study of excitation spectra of doubly doped glasses indicates that energy transfers from Pr 3+, Sm 3+, Gd 3+ to Eu 3+ and from Ce 3+, Gd 3+, Dy 3+ to Tb 3+.
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