Luminescence Properties of Ce/Tb/Sm Co-Doped Tellurite Glass for White Leds Application

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In this work, the Ce/Tb/Sm doped glasses with the composition of TeO₂-B₂O₃-ZnO-Na₂O were synthesized by melt quenching process. The photoluminescence properties of glasses doped with Ce³⁺, Tb³⁺ and Sm³⁺ single, doubly and triply doped TeO₂-B₂O₃-ZnO-Na₂O (TBZN) were studied by mean of emission and excitation spectra. There was an overlap between Ce³⁺ emission and Tb³⁺, Sm³⁺ absorption in the wavelength range of 350–500 nm. Therefore, it was expected that an efficient energy transfer occurred from Ce³⁺ to Tb³⁺ and Ce³⁺ to Sm³⁺ ions. When excited by ultraviolet wavelengths the co-doped glasses emit a combination of blue, green and red orange forming white light.