Abstract
Near-infrared (NIR) excitation of Er3+-doped lithium-modified tellurite (Li:TeO2) glass results in anti-Stokes fluorescent emissions near 380 nm, 530 nm, 551 nm and 654 nm in addition to NIR Stokes emission. The anti-Stokes emissions are ascribed to transitions from the excited 4G11/2, 4S3/2(2H11/2) and 4F9/2 levels in Er3+. The excitation involves three and two incident photons. 532-nm excitation of this glass also leads to similar emissions. The mechanisms involved in these processes are discussed and the upconversion efficiency is calculated. The temperature dependence of the upconversion process has also been investigated. It is found that Er3+-doped tellurite glass can be used as a temperature sensor in the range 300–530 K.
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