Abstract

The zinc tellurite glasses (TZO) codoped with ${Eu}^{3+}{{–}} {Yb}^{3+}$ ions have been prepared by the conventional melt and quenching technique. The photoluminescence spectra of the glass samples have been measured under 976-nm CW diode laser excitation. Several upconversion emission bands ranging from the blue to near infrared region have been detected in the codoped samples. The sensitized cooperative energy transfer process from the ${Yb}^{3+}$ to ${Eu}^{3+}$ ions and cross-relaxation process has been found to be responsible mechanism for the upconversion emissions in ${Eu}^{3+}$ ions.

© 2013 IEEE

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