Journal
MATERIALS LETTERS
Volume 99, Issue -, Pages 86-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2013.02.062
Keywords
Upconversion; Quantum yield; Oxysulphide; Lanthanum; Fluorescence; Erbium; Ytterbium; Sodium Ytterbium Floride; Effeciency
Funding
- National Science Foundation Partnerships for Research and Education in Materials (PREM) [DMR-0934218]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [934218] Funding Source: National Science Foundation
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In this letter, we report the absolute upconversion quantum yields (QY) for 9% Yb3+ and 1% Er3+ co-doped La2O2S and its comparison with NaYF4 doped with 20% Yb3+, 2% Er3+ for all the upconversion emissions centered at 410, 550, 667, and 822 nm at various excitation power densities at 977 nm excitation. The maximum upconversion QY for 9% Yb3+ and 1% Er3+ co-doped La2O2S was measured to be 5.83 +/- 0.87% at the excitation power density of 13 W/cm(2). An excitation power dependent study revealed that although absolute upconversion QY measured for NaYF4: 20% Yb, 2% Er is higher at higher excitation power densities, La2O2S: 9% Yb, 1% Er possesses higher QYs at the lower excitation power densities. (c) 2013 Elsevier B.V. All rights reserved.
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