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Temperature Effects in Up-Conversion Processes of Erbium - Ytterbium Doped Oxyfluoride Silicate Glass Er3+ - Yb3+ doped oxyfluoride glass has been synthesized and investigated. It was found that the up-conversion spectrum of the sample excited by a 980 nm laser diode is highly dependent on the temperature of the sample. Using fluorescence intensity ratio technique the green up-conversion emissions at 525 nm and 550 nm were studied in detail in the temperature range 120-600 K. The potential applicability of the obtained results in the field of the temperature sensing is discussed. Temperatūras Efekti Daudzfotonu Ierosmes Procesā AR Erbiju UN Iterbiju Legētā Oksifluorīdu Silikāta Stiklā Tika sintezēts un pētīts ar Er3+ un Yb3+ legēts oksifluorīda stikls. Ierosinot paraugu daudzfotonu procesā ar 980 nm starojumu, novērota luminiscences spektra būtiska atkarība no temperatūras, intervālā 120-600 K. Izmantojot luminiscences intensitāšu attiecības metodi, spriests par iespējamo oksifluorīda stikla pielietojumu temperatūras sensoru jomā.