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APPLIED PHYSICS LETTERS
Volume 88, Issue 10, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2183737
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Hydrothermally prepared nanophosphor Y2SiO5:Ce crystallizes in the P2(1)/c structure, rather than the B2/b structure observed in bulk material. Relative to bulk powder, nanophosphors of particle size similar to 25-100 nm diameter exhibit redshifts of the photoluminescence excitation and emission spectra, reduced self absorption, enhanced light output, and medium-dependent radiative lifetime. Photoluminescence data are consistent with reduced symmetry of the P2(1)/c structure and are not necessarily related to reduced dimensionality of the nanophosphor. In contrast, medium-dependent lifetime and enhanced light output are attributed to nanoscale behavior. Perturbation of the Ce ion electric field is responsible for the variable lifetime.
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