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

Cited 40 time in Web of Science Cited 41 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
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
http://hdl.handle.net/10371/166047
DOI
https://doi.org/10.1039/c5cp01634g
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)
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