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Tb 3+ /Dy 3+  co-doped glass with host system of SiO 2 -Al 2 O 3 -B 2 O 3 -La 2 O 3 -Gd 2 O 3  were prepared by melt-quenching method. The photoluminescence occurred under the transitions,  5 D 3 ,  5 D 4  →  7 F J  of Tb 3+  and  4 F 9/2  →  6 H J  of Dy 3+  doped in glass. The emission spectra showed various transitions from the excited Tb 3+ , Dy 3+  and Gd 3+  ions which were calculated the color of emitted light and displayed in CIE diagram. The mixing emission of Tb 3+  and Dy 3+  (λ ex  = 376 nm and 349 nm) performed the yellowish-green color, while the energy transfer from Gd 3+  (λ ex  = 270 nm) made Tb 3+  and Dy 3+  generating the white light. The energy transfer processes between Tb 3+ , Dy 3+  and Gd 3+  ions were verified by the excitation and emission spectra. The photoluminescence decay times of Tb 3+  and Dy 3+  in this glass are in millisecond order. The light yield of glass under excitation with 5.50 MeV of α particles were investigated and compared to Bi 4 Ge 3 O 12  (BGO) crystal. This work could be useful for light source medium and radiation detection material.

Luminescence and Energy Transfer of Tb 3+ /Dy 3+ Co-Doped SiO 2 -Al 2 O 3 -B 2 O 3 -La 2 O 3 -Gd 2 O 3 Glasses