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Luminescence properties of dual valence Eu doped nano-crystalline BaF2 embedded glass-ceramics and observation of Eu2+ -> Eu3+ energy transfer

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

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Title Luminescence properties of dual valence Eu doped nano-crystalline BaF2 embedded glass-ceramics and observation of Eu2+ -> Eu3+ energy transfer
 
Creator Biswas, Kaushik
Sontakke, Atul D
Sen, Ranjan
Annapurna, K
 
Subject Glass
 
Description Europium doped glass ceramics containing BaF2 nano-crystals have been prepared by using the controlled crystallization of melt-quenched glasses. X-ray diffraction and transmission electron microscopy have confirmed the presence of cubic BaF2 nano-crystalline phase in glass matrix in the ceramized samples. Incorporation of rare earth ions into the formed crystalline phase having low phonon energy of 346 cm-1 has been demonstrated from the emission spectra of Eu3+ ions showing the transitions from upper excitation states 5DJ (J = 1, 2, and 3) to ground states for the glass-ceramics samples. The presence of divalent europium ions in glass and glass-ceramics samples is confirmed from the dominant blue emission corresponding to its 5d-4f transition under an excitation of 300 nm. Increase in the reduction of trivalent europium (Eu3+) ions to divalent (Eu2+) with the extent of ceramization is explained by charge compensation model based on substitution defect mechanisms. Further, the phenomenon of energy transfer from Eu2+ to Eu3+ ion by radiative trapping or reabsorption is evidenced which increases with the degree of ceramization. For the first time, the reduction of Eu3+ to Eu2+ under normal air atmospheric condition has been observed in a BaF2 containing oxyfluoride glass-ceramics system.
 
Publisher Springer/Plenum Publishers
 
Date 2012-03
 
Type Article
NonPeerReviewed
 
Format application/pdf
 
Identifier http://cgcri.csircentral.net/7/1/KB_Journal_of_fluorescence[1].pdf
Biswas, Kaushik and Sontakke, Atul D and Sen, Ranjan and Annapurna, K (2012) Luminescence properties of dual valence Eu doped nano-crystalline BaF2 embedded glass-ceramics and observation of Eu2+ -> Eu3+ energy transfer. Journal of Fluorescence, 22 (2). pp. 745-752. ISSN 1053-0509
 
Relation http://cgcri.csircentral.net/7/