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Thin film fabrication of upconversion lanthanide-doped NaYF4 by a sol-gel method and soft lithographical nanopatterning

Authors
Park, HeeyeonYoo, Gang YeolKim, Min-SeopKim, KeinLee, ChihoPark, SungnamKim, Woong
Issue Date
25-12월-2017
Publisher
ELSEVIER SCIENCE SA
Keywords
NaYF4; Upconversion; Thin films; Sol-gel; Nanopatterns; Soft lithography
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.728, pp.927 - 935
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
728
Start Page
927
End Page
935
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81135
DOI
10.1016/j.jallcom.2017.09.076
ISSN
0925-8388
Abstract
Lanthanide-doped NaYF4 is one of the most efficient upconversion materials and fabrication of high-quality thin-films of this material would be useful in various applications. However, it has been a great challenge to fabricate thin films and/or nanopatterns of this material. In this work, we demonstrate the successful fabrication of the NaYF4 thin films and nanopatterns via a sol-gel process and soft lithography. Upconversion of 980 nm near-infrared wavelength to various visible wavelengths (yellow, green, blue, etc.) has been realized using dopants and/or multilayered film structures. Nanopatterns enhance the light out-coupling efficiency and thus the upconversion intensity by a factor of similar to 2-3. The fabrication of high-quality films and patterns is enabled by understanding the dependence of the structural, optical, chemical, and thermal properties of the precursor materials on the temperature. Our results will be an important basis for both scientific and technological advances in wavelength conversion in various areas such as displays, optoelectronics, photonics, and photovoltaics. (C) 2017 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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