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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 6 — Mar. 15, 2014
  • pp: 1386–1389

Enhanced upconversion emission in colloidal (NaYF4:Er3+)/NaYF4  core/shell nanoparticles excited at 1523 nm

Wei Shao, Guanying Chen, Jossana Damasco, Xianliang Wang, Aliaksandr Kachynski, Tymish Y. Ohulchanskyy, Chunhui Yang, Hans Ågren, and Paras N. Prasad  »View Author Affiliations


Optics Letters, Vol. 39, Issue 6, pp. 1386-1389 (2014)
http://dx.doi.org/10.1364/OL.39.001386


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Abstract

In this work, we report on efficient visible and near-IR upconversion emissions in colloidal hexagonal-phase core/shell NaYF4:Er3+/NaYF4 nanoparticles (38nm) 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 3.9±0.3% under an excitation density of 18W/cm2. 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 1.518W/cm2, which again demonstrates high upconversion efficiency.

© 2014 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(190.7220) Nonlinear optics : Upconversion

ToC Category:
Nonlinear Optics

History
Original Manuscript: January 3, 2014
Revised Manuscript: January 19, 2014
Manuscript Accepted: January 19, 2014
Published: March 5, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Wei Shao, Guanying Chen, Jossana Damasco, Xianliang Wang, Aliaksandr Kachynski, Tymish Y. Ohulchanskyy, Chunhui Yang, Hans Ågren, and Paras N. Prasad, "Enhanced upconversion emission in colloidal (NaYF4:Er3+)/NaYF4  core/shell nanoparticles excited at 1523 nm," Opt. Lett. 39, 1386-1389 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-6-1386


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