Laser and optical properties (absorbance, excitation/emission and decay time data) of Dy3+, Dy3+/Sm3+, Dy3+/Sm3+/Eu3+-doped Li2O-Al2O3-ZnO-P2O5 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 Dy3+/Sm3+-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 F-4(9/2) level lifetime revealed that Sm3+ can be sensitized by Dy3+ by means of a non-radiative energy transfer that could be occurring into Dy3+-Sm3+ clusters with an efficiency of 0.13. The Dy3+/Sm3+/Eu3+-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 Dy3+ ion F-4(9/2) and Sm3+ 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 Dy3+-Sm3+-Eu3+ clusters with energy transfer efficiencies of 0.22 and 0.41, respectively.
Li2O-Al2O3-ZnO-P2O5:Dy3+/Sm3+/Eu3+ glasses for solid-state yellow laser and color tunable phosphor applications
Speghini, A;
2021-01-01
Abstract
Laser and optical properties (absorbance, excitation/emission and decay time data) of Dy3+, Dy3+/Sm3+, Dy3+/Sm3+/Eu3+-doped Li2O-Al2O3-ZnO-P2O5 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 Dy3+/Sm3+-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 F-4(9/2) level lifetime revealed that Sm3+ can be sensitized by Dy3+ by means of a non-radiative energy transfer that could be occurring into Dy3+-Sm3+ clusters with an efficiency of 0.13. The Dy3+/Sm3+/Eu3+-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 Dy3+ ion F-4(9/2) and Sm3+ 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 Dy3+-Sm3+-Eu3+ clusters with energy transfer efficiencies of 0.22 and 0.41, respectively.
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