Authors: J A Jiménez
Publish Date: 2014/05/31
Volume: 43, Issue: 9, Pages: 3588-3592
Abstract
Codoping of a P2O5BaO glass matrix with divalent tin and trivalent samarium ions has been realized by the meltquenching technique with the purpose of investigating the material’s luminescent properties Photoluminescence excitation spectra obtained by monitoring Sm3+ 4G5/2 emission showed a broad excitation band around 290 nm absent in a Sm3+doped reference typical of donor/acceptor energy transfer Under such excitation the material exhibits a reddishwhite emission Timeresolved spectra recorded under the 290nm excitation nonresonant with Sm3+ excitation peaks exposed a broad bluewhite band characteristic of twofoldcoordinated Sn centers and orangered emission bands of Sm3+ ions which appeared well separated in time in accord with their emission decay dynamics Consequently the data indicate that light absorption occurs at Sn centers donors followed by energy transfer to samarium ions acceptors which results in populating the 4G5/2 emitting state in Sm3+ Energy transfer pathways likely resulting in the sensitization of Sm3+ photoluminescence are discussed Results are put into context in terms of the potential of SnO and rareearth codoped barium phosphate glasses for use in white lightemitting devices
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