Abstract
Enhancement of upconverted luminescence in Er3+∕Yb3+:TeO2 has been observed with increase in the concentration of Yb3+ on excitation with 780nm laser radiation. It is further noted that the upconversion is increased even above the quenching limit on increasing the temperature of the glass. The incident radiation excites Yb3+ indirectly via Er3+ resulting in a strong blue emission from Yb3+ and green and red emissions from Er3+. The UV emission from Er3+ at 380nm involves three near infrared photons when there is no Yb3+ in the glass but when Yb3+ is also present, this behaves as a two photon process. The lifetime of the S3∕24 level of Er3+ in glasses containing only Er3+ and also those containing both Er3+ and Yb3+ has also been measured in different conditions.
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