Structure, nucleation and Eu luminescence in alkaline earth rare earth borate glass |
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Authors: | R. Jagannathan P. Jeyagopal A. Mani |
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Affiliation: | Central Electrochemical Research Institute, Karaikudi-623006, India |
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Abstract: | In La2O3-MO-B2O3 ternary system, various glasses/ glass ceramics with M=Ca, Sr and Ba have been prepared. In this ternary system, homogeneous nucleation occuring in the B2O3 melt appears to be the cause for the formation of nanocrystallites, hence glass ceramics. The nucleation process is very much dependent on the alkaline earth used viz., with smaller alkaline earths like Ca, boron prefers (BO4)5− tetrahedral coordination with oxygen, while in the case of bigger alkaline earths like Ba and Sr, (BO3)3− triangular coordination seems to be predominant. Eu3+ in this glass system yields intense 5D0→7Fj emission. A cursory view on the dependence of the various Judd-Ofelt parameters (Ωk) indicates that Ω2 parameter is very much dependent on the immediate vicinity of the luminescent ion (Eu3+) while Ω4 is not. Various results based on these are discussed. |
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