Abstract
The TeO2-PbCl2-WO3:Er3+ glasses were prepared by melt-quenching technique. Optical and luminescence properties of the prepared glasses were studied by transmission and low-temperature photoluminescence spectroscopy. Emission intensities of the relevant 4f-4f transitions were studied at room temperature under 514.5 nm excitation. At low-temperatures, the broad-band emission of the host glass centered at about 1000 nm and three superimposed narrow Er3+-related emission bands were observed. Strong infrared to visible up-conversion luminescence was observed under 980 nm excitation even at low erbium concentration. The observed green, red, and NIR up-conversion 4f-4f emission bands at 530, 550, 660, and 850 nm are assigned to two-photon absorption processes. It follows from the study of luminescence intensity ratio of two green Er3+- related emission bands due to transitions from thermally coupled 2H11/2 and 4S3/2 levels to the ground state 4I15/2 that the studied glasses can be good candidates for non-contact optical temperature sensor applications.
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