Cation-Size Mismatch as a Design Principle for Enhancing the Efficiency of Garnet Phosphors
- Authors
- Kim, Yoon Hwa; Kim, Ha Jun; Ong, Shyue Ping; Wang, Zhenbin; Im, Won Bin
- Issue Date
- Apr-2020
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.32, no.7, pp.3097 - 3108
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 32
- Number
- 7
- Start Page
- 3097
- End Page
- 3108
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1972
- DOI
- 10.1021/acs.chemmater.0c00095
- ISSN
- 0897-4756
- Abstract
- In this study, we report on the development of a new garnet phosphor with enhanced optical properties and cost reduction. Samples were prepared using the solid-solution method, in which the chemical unit and substitutions with cation-size mismatch were combined. Solid solutions between two garnet structure compounds, green phosphor Lu3Al5O12:Ce3+ (LuAG:Ce3+) and orange phosphor Lu2CaMg2Si3O12:Ce3+ (Lu3-x CaxAl2-2xMg2xAl3-3xSi3xO12:Ce3+), constituted the complete solid-solution range x (x = 0-1). The crystal structures of all the compounds were discerned through Rietveld refinement based on the X-ray diffraction patterns. The unique occupancy of {Lu/Ca}, [Al/Mg], (Al/Si), and O atoms in the solid-solution samples was identified. Optical properties were classified in terms of the excitation and emission spectra, quantum yield, and temperature-dependent photoluminescence intensity. To investigate the relationship between the structural and optical changes, Ba2+ ions (employed for cation-size mismatch) were substituted into dodecahedral and octahedral sites at various concentrations. Finally, we report the development of a new green garnet phosphor via the use of a solid-solution design and cation-size mismatch, the emission intensity of which was measured 116% higher than that of commercial LuAG:Ce3+.
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