Ultra-high photoluminescent quantum yield of β-NaYF4: 10% Er3+via broadband excitation of upconversion for photovoltaic devices

Sean K. W. Mac Dougall, Aruna Ivaturi, Jose Marques-Hueso, Karl W. Krämer, Bryce S. Richards

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64 Citations (Scopus)


The upconversion photoluminescent quantum yield (PLQY) of erbium-doped hexagonal sodium yttrium fluoride (β-NaYF 4 : 10% Er 3+ ) was measured under broadband excitation with full width half maxima ranging from 12 to 80 nm. A novel method was developed to increase the bandwidth of excitation, while remaining independent of power via normalization to the air mass 1.5 direct solar spectrum. The measurements reveal that by broadening the excitation spectrum a higher PLQY can be achieved at lower solar concentrations. The highest PLQY of 16.2 ± 0.5% was achieved at 2270 ± 100 mW mm.2 and is the highest ever measured.
Original languageEnglish
Pages (from-to)A879-A887
Number of pages9
JournalOptics Express
Issue numberS6
Publication statusPublished - 5 Nov 2012

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