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

Published online by Cambridge University Press:  24 May 2013

Culala Rajasekharaudayar Kesavulu ,
Mi-Yeon Yoo ,
Jin-Ho Lee ,
Ki-Soo Lim ,
Peyala Dharmaiah ,
Chalicheemalapalli Kulala Jayasankar  and
Palamandala Babu
Culala Rajasekharaudayar Kesavulu
Affiliation:
Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea
Mi-Yeon Yoo
Affiliation:
Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea
Jin-Ho Lee
Affiliation:
Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea
Ki-Soo Lim*
Affiliation:
Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea
Peyala Dharmaiah
Affiliation:
Department of Physics, Sri Venkateswara University, Tirupati-517 502, India
Chalicheemalapalli Kulala Jayasankar
Affiliation:
Department of Physics, Sri Venkateswara University, Tirupati-517 502, India
Palamandala Babu
Affiliation:
Department of Physics, Government Degree College, Satyaveedu-517 588, India
*
a)Address all correspondence to this author. e-mail: kslim@chungbuk.ac.kr
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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.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 11 , 14 June 2013 , pp. 1481 - 1489
Copyright
Copyright © Materials Research Society 2013 

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