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Rare-earth (RE) orthophosphates of the form REPO4 are compounds with high RE concentrations (1.3–1.6 × 1022 cm−3) and small distances between adjacent RE sites (∼0.4 nm). Transparent sol–gel-derived silica glasses… Click to show full abstract
Rare-earth (RE) orthophosphates of the form REPO4 are compounds with high RE concentrations (1.3–1.6 × 1022 cm−3) and small distances between adjacent RE sites (∼0.4 nm). Transparent sol–gel-derived silica glasses containing Tb-rich (Tb,Ce)PO4 nanocrystals exhibited bright green photoluminescence from Tb3+ ions with internal quantum efficiencies close to unity upon ultraviolet photoexcitation of Ce3+ ions. The maximum external quantum efficiency was ∼0.95 and emissions from Ce3+ ions were absent. Negligible concentration quenching was achieved by eliminating quenching centres in the nanocrystals in which the rapid migration of excitation energy over Tb3+ ions is unrestrained.
Journal Title: Journal of Materials Chemistry C
Year Published: 2021
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