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Abstract: To improve the infrared emission of Yb3+ ions doped in the garnet host Y3Al5O12 (YAG) single crystal through the energy transfer from Ce3+ to Yb3+ ions, the 〈111〉-oriented YAG:Ce3+, YAG:Yb3+, YAG:(Ce3+, Yb3+) and Yb3Al5O12:Ce3+ (YbAG:Ce3+) single crystals were grown using the Czochralski Method, respectively. The excitation and emission spectra of these garnet single crystals were characterized. In YAG:Ce3+ crystal, the yellow emission of Ce3+ ions present, but it was completely extinguished in YAG:(Ce3+, Yb3+) crystal and YbAG:Ce3+ crystal. However, the characteristic absorption bands of Ce3+ still existed in the excitation spectrum of Yb3+ ions, which showed that the energy absorbed by Ce3+ ions can be transferred to Yb3+ ions for its infrared emission. [Copyright &y& Elsevier]

An intense reddish-orange phosphor, Gd2MoO6:Sm3+, was developed by solid state chemistry. The photoluminescence excitation and emission spectra, concentration effect are investigated. The results show an efficient energy transfer from MoO66- group to Sm3+ occurs and Sm3+ ion emits an intense reddish-orange light with high color purity and an excellent reproduction quality of optical properties. These results demonstrate that Sm3+ ion with low 4f-4f absorption efficiency in near ultraviolet region can play a role of activator in narrow reddish-orange emitting phosphor potentially useful in ∼370 nm GaN-based light emitting diode through efficient energy feeding by charge transfer absorption of MoO66- group. [ABSTRACT FROM AUTHOR]