Abstract
The spectroscopic characteristics of the thulium and dysprosium co-doped congruent LiNbO3 (Tm:Dy:CLN) single crystals have been studied for white-light generation. The chromaticity coordinates, color purity and color temperature could be tuned with different doping concentrations or temperatures. Optimal white emission was achieved when co-doped 0.5mol% Tm3+ and 1.0mol% Dy3+ under 363nm excitation. The optimal operating temperature of Tm(0.5mol%):Dy(1mol%):CLN for white emissions was determined to be 400K with the minimum color purity of 10%. The energy transfers between Tm3+ and Dy3+ were analyzed in detail and the energy transfer efficiencies at temperature ranging from 20K to 430K were determined. The results in this paper indicated the potential applications of Tm:Dy:CLN in optical temperature sensors and ultraviolet (UV) excited white light emission.
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