Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 13, Pages 2513-2517Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc03102h
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Funding
- NCN [2012/05/N/ST5/02327]
- Foundation for Polish Science
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The influence of sensitizer concentration on the up-conversion properties of KLa0.99-xTm0.01YbxP4O12 nanocrystals was investigated in a wide range of Yb3+ concentrations (x = 0.05-0.5). This impact was manifested by Yb3+ concentration dependent variation of up-conversion emission spectra, blue to NIR emission ratio variation, luminescence decay times as well as on the order of upconversion processes. The observed processes of energy transfer between Yb3+ and Tm3+ were discussed in terms of reduction of the average distance between dopants, Tm3+ -> Yb3+ back energy transfer and energy migration to surface quenchers over a Yb3+ sublattice.
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