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The preferred upconversion pathway for the red emission of lanthanide-doped upconverting nanoparticles, NaYF4:Yb3+,Er3+

Cited 56 time in Web of Science Cited 58 time in Scopus
Authors

Jung, Taeyoung; Jo, Hong Li; Nam, Sang Hwan; Yoo, Byeongjun; Cho, Youngho; Kim, Jongwoo; Kim, Hyung Min; Hyeon, Taeghwan; Suh, Yung Doug; Lee, Hohjai; Lee, Kang Taek

Issue Date
2015-05
Publisher
Royal Society of Chemistry
Citation
Physical Chemistry Chemical Physics, Vol.17 No.20, pp.13201-13205
Abstract
Lanthanide-doped upconverting nanoparticles (UCNPs, NaYF4:Yb3+, Er3+) are well known for emitting visible photons upon absorption of two or more near-infrared (NIR) photons through energy transfer from the sensitizer (Yb3+) to the activator (Er3+). Of the visible emission bands (two green and one red band), it has been suggested that the red emission results from two competing upconversion pathways where the non-radiative relaxation occurs after the second energy transfer (pathway A, I-4(15/2) -> I-4(11/2) -> F-4 -> -> H-2(11/2) -> S-4(3/2) -> F-4(9/2) -> I-4(15/2)) or between the first and the second energy transfer (pathway B, I-4(15/2) -> I-4(11/2) -> I-4(13/2) -> F-4(9/2) -> I-4 ->). However, there has been no clear evidence or thorough analysis of the partitioning between the two pathways. We examined the spectra, power dependence, and time profiles of UCNP emission at either 980 nm or 488 nm excitation, to address which pathway is preferred. It turned out that the pathway B is predominant for the red emission over a wide range of excitation powers.
ISSN
1463-9076
URI
https://hdl.handle.net/10371/166047
DOI
https://doi.org/10.1039/c5cp01634g
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  • School of Chemical and Biological Engineering
Research Area Chemistry, Materials Science

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