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Laser and optical properties (absorbance, excitation/emission and decay time data) of Dy 3? , Dy 3? /Sm 3? , Dy 3? /Sm 3? /Eu 3? -doped Li 2 O-Al 2 O 3 -ZnO-P 2 O 5 glasses are investigated. Laser spectroscopic parameters of the dysprosium yellow emission show potentialities of the luminescent glass as yellow laser medium under excitation at 348 nm. The Dy 3? /Sm 3? -activated glass tonality can be shifted from neutral white of 4559 K under 350 nm excitation to yellowish-orange of 2033 K (85.3% color purity) upon 372 nm excitation. A shortening of the dysprosium 4 F 9/2 level lifetime revealed that Sm 3? can be sensitized by Dy 3? by means of a non-radiative energy transfer that could be occurring into Dy 3? -Sm 3? clusters with an efficiency of 0.13. The Dy 3? /Sm 3? /Eu 3? -activated glass tonality can be shifted from warm white of 3387 K under 350 nm excitation to reddish-orange of 1638 K (92.1% color purity) upon 372 nm excitation. From lifetime data of the Dy 3? ion 4 F 9/2 and Sm 3? ion 4 G 5/2 levels is inferred that non-radiative energy transfers from dysprosium to europium and/ or samarium and from samarium to europium could be occurring into Dy 3? -Sm 3? -Eu 3? clusters with energy transfer efficiencies of 0.22 and 0.41, respectively.

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