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Cation-Size Mismatch as a Design Principle for Enhancing the Efficiency of Garnet Phosphors

Title
Cation-Size Mismatch as a Design Principle for Enhancing the Efficiency of Garnet Phosphors
Author
임원빈
Keywords
CRYSTAL-CHEMISTRY; CE3+ LUMINESCENCE; PHOTOLUMINESCENCE; ENERGY
Issue Date
2020-03
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v. 32, no. 7, page. 3097-3108
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+.
URI
https://pubs.acs.org/doi/10.1021/acs.chemmater.0c00095https://repository.hanyang.ac.kr/handle/20.500.11754/162044
ISSN
0897-4756; 1520-5002
DOI
10.1021/acs.chemmater.0c00095
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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