“…Tellurite glasses have been investigated extensively due to their favorable physical and chemical properties such as, relatively lowphonon energy, high refractive index, high dielectric constant, good infrared transmissivity, low glass transition and melting temperature, thermal and chemical stability and high devitrification resistance [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Owing to these numerous properties, tellurite glasses have become preferable host materials for some infrared and infrared to visible upconversion applications in optical data storage, lasers, sensors and spectroscopic devices [5][6][7][8]11,[14][15][16][17][18][19][20].…”