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Enhanced upconversion luminescence intensity of core-shell NaYF4 nanocrystals guided by morphological control.

07:00 EST 28th December 2018 | BioPortfolio

Summary of "Enhanced upconversion luminescence intensity of core-shell NaYF4 nanocrystals guided by morphological control."

How to further increase the upconversion luminescence (UCL) efficiency of core-shell upconversion nanoparticles (UCNPs) is highly desirable for their photoelectric and bio-logical applications. Herein, a novel but facile strategy is proposed to substantially enhance the UCL intensity of NaYF4 based core-shell UCNPs by morphological control. The morphologies of core-shell UCNPs can be optimized from rod-like to spherical like by changing the ratio of oleic acid (OA) to 1-octadecene (ODE) during the shell growth process with other reaction conditions constant. The mechanism of shape control is further investigated based on the competitive absorption between OA molecules and lanthanide ions (Y3+, Yb3+, Er3+ or Tm3+) onto the different crystal axes (a, b and c) to guide their shell growth speed. Comparing with the rod like core-shell UCNPs, the UCL intensities of spherical like are increased by 11.7 folds for Er3+ (541 nm emission) doping, corresponding to the UCL lifetime enhancement from 0.59 ms (for rod like) to 1.15 ms (for spherical like). Therefore, our designed novel strategy can greatly improve the UCL efficiency of core-shell UCNPs and promote their development in diverse applications.

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Name: Nanotechnology
ISSN: 1361-6528
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