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Y3Ga5O12:Eu3+, YGG:Tb3+, and YGG:Eu3+,Tb3+ nanocrystalline are synthesized by the sol–gel combustion method. The phase composition, morphology, and luminescent properties are investigated in detail, and the influence of energy transfer between activators on the luminescent properties is also discussed. The results show that under UV excitation, the optimal doping concentration of YGG:Eu3+ nanocrystal is 0.1, and the emission light is red-orange. In the YGG:Eu3+,Tb3+ codoped nanocrystalline, Tb3+ acts as an effective sensitizer and can improve the emission intensity of Eu3+ by transferring the absorbed excitation energy through the dipole–dipole interaction mechanism. At the same time, the blue emission of 489 nm and the green emission of 544 nm generated by YGG:Tb3+ under UV excitation can effectively improve the red-orange emission of YGG:Eu3+ due to the lack of blue-green emission, resulting in white light with good color purity. The results show that Eu3+,Tb3+ codoped YGG nanocrystalline have potential applications in white light-emitting diodes. [ABSTRACT FROM AUTHOR]

To the best of our knowledge, the spectroscopic and highly efficient tunable multi-wavelength laser properties of Er3+,Yb3+,Pr3+ triple-doped BaLaGa3O7 crystals are demonstrated for the first time in this study. The maximum output power of 0.81 W at ∼2.7 μm was obtained under the absorbed pump power of 3.53 W with an optical-to-optical conversion efficiency of 22.9%. The slope efficiency is 27.0%. The results demonstrate that the triple-doped crystals with the sensitizer Yb3+ and deactivator Pr3+ can not only enhance the pump efficiency effectively but also suppress the self-terminating "bottleneck" effect of Er3+ so that the laser threshold is reduced and the laser efficiency is improved. The Er3+,Yb3+,Pr3+ triple-doped BaLaGa3O7 crystal is a promising candidate for high-efficiency mid-infrared laser devices. [ABSTRACT FROM AUTHOR]