Journal
OPTICS LETTERS
Volume 39, Issue 6, Pages 1386-1389Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.001386
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Funding
- Natural Science Foundation of China [51102066]
- Program for Basic Research Excellent Talents in Harbin Institute of Technology [BRETIII 2012018]
- National Science Fund for Distinguished Young Scholars [51325201]
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In this work, we report on efficient visible and near-IR upconversion emissions in colloidal hexagonal-phase core/shell NaYF4:Er3+/NaYF4 nanoparticles (similar to 38 nm) under IR laser excitation at 1523 nm. Varying amounts of Er3+ dopants were introduced into the core NaYF4:Er3+ nanoparticles, revealing an optimized Er3+ concentration of 10% for the highest luminescent efficiency. An inert epitaxial shell layer of NaYF4 grown onto the core of the NaYF4:Er3+ 10% nanoparticle increased its upconversion emission intensity fivefold due to suppression of surface-related quenching mechanisms, yielding the absolute upconversion efficiency to be as high as similar to 3.9 +/- 0.3% under an excitation density of 18 W/cm(2). The dependence of the intensity of upconversion emission peaks on laser excitation density in the core/shell nanoparticle displayed saturation effects at low excitation density in the range of 1.5-18 W/cm(2), which again demonstrates high upconversion efficiency. (C) 2014 Optical Society of America
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