Abstract
The ZrO2:Er3+ codoped with Yb3+ phosphor powders have been prepared by the urea combustion route. Formation of the compounds ZrO2:Er3+ and ZrO2:Er3+, Yb3+ was confirmed by XRD. The frequency upconversion emissions in the green and red regions upon excitation with a CW diode laser at ∼978 nm are reported. Codoping with Yb3+ enhances the emission intensities of the triply ionized erbium in the green and red spectral regions by about ∼130 and ∼820 times respectively. The emission properties of the ZrO2:Er3+ phosphor powders are discussed on the basis of excited state absorption, energy transfer, and cross-relaxation energy transfer mechanisms.
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