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Optical and upconversion properties of Er3+-doped oxyfluoride transparent glass-ceramics containing SrF2 nanocrystals

  • Culala Rajasekharaudayar Kesavulu (a1), Mi-Yeon Yoo (a1), Jin-Ho Lee (a1), Ki-Soo Lim (a1), Peyala Dharmaiah (a2), Chalicheemalapalli Kulala Jayasankar (a2) and Palamandala Babu (a3)...

Abstract

Er3+-doped oxyfluoride transparent glass and glass-ceramics (GCs) containing SrF2 nanocrystals were prepared and their spectroscopic properties were investigated. The formation of SrF2 nanocrystals in GCs has been confirmed by x-ray diffraction (XRD) and transmission electron microscopy. The Judd-Ofelt (JO) parameters have been evaluated from absorption spectra of the Er3+-doped glass and GCs, which are used to predict radiative properties for some important luminescence levels of Er3+ ions in glass and GCs. The XRD and JO parameters suggest that the Er3+ ions are progressively incorporated into the SrF2 nanocrystals in the GCs compared with glass. The up-conversion luminescence intensity increases significantly in GCs with increase in time of thermal treatment. The lifetime of the 4S3/2 level of the Er3+ ions in GCs is found to be slightly higher than that in the glass due to the incorporation of Er3+ ions into the lower phonon energy of SrF2 nanocrystals in the GCs.

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a)Address all correspondence to this author. e-mail: kslim@chungbuk.ac.kr

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