Origin of strong red emission in Er3+-based upconversion materials: role of intermediate states and cross relaxation
- Authors
- Lee, Chiho; Park, Heeyeon; Kim, Woong; Park, Sungnam
- Issue Date
- 21-11월-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.21, no.43, pp.24026 - 24033
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS
- Volume
- 21
- Number
- 43
- Start Page
- 24026
- End Page
- 24033
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/61552
- DOI
- 10.1039/c9cp04692e
- ISSN
- 1463-9076
- Abstract
- Among the various upconversion (UC) materials, sodium yttrium fluoride doped with ytterbium and erbium (NaYF4:Yb3+,Er3+) is the most widely studied owing to its high UC efficiency. Nonetheless, UC mechanisms are not yet fully understood and, in particular, near-infrared-to-red UC mechanisms are still under debate. Herein, we examine UC mechanisms in Er3+-based UC materials. Most importantly, the F-4(3/2) and F-4(5/2) states of Er3+ were found to be important intermediate states for strong red emission, for the first time. The cross relaxation between the Er3+ ions, back energy transfer from Er3+ to Yb3+, and relative doping concentrations of Er3+ and Yb3+ in NaYF4:Yb3+,Er3+ were found to play important roles in the relative intensity between red and green emissions. The proposed UC mechanism will provide design principles for various Er3+-based UC materials.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
- College of Science > Department of Chemistry > 1. Journal Articles
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