This study presented the luminescence properties of Nd3+/Yb3+/Ho3+ dopant ions inside a host based on Ga2O3-GeO2-Li2O (GGL) glass. The measured differential scanning calorimetry result showed that GGL glass exhibited excellent stability against devit-rification with?T=135 oC. Obvious 543 and 657 nm emissions were observed in Nd3+/Ho3+-codoped sample. The incorporation of Yb3+ into Nd3+/Ho3+-codoped glass system had resulted in enhanced upconversion emission intensity under the excitation of 808 nm and/or 980 nm laser diode (LD). The possible mechanisms and related discussions on this phenomenon were presented. It was noted that the presence of Yb3+ yielded an enhancement about 7 and 11 times in the 543 and 657 nm emission intensities respectively under 808 nm excitation due to the energy transfer from Nd3+ to Ho3+ via Yb3+ ion. Here Yb3+ played a major role as a bridging ion. While enhanced 543 and 657 nm emission intensities under the excitation of 980 nm LD originated from the sensitization effect of Yb3+. Our results showed that Nd3+/Ho3+/Yb3+ triply doped GGL glass might be a promising candidate for the development of visible-laser materials.
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