Abstract
The structural and photoluminescence (PL) properties of as-synthesized and aged garnet-type Li7La3- xZr2O12:xEu3+ (0.02 ≤ x ≤ 0.10) phosphors for white light-emitting diode applications were systematically investigated. Li7La3Zr2O12 oxides satisfied the criteria, proposed by F. C. Hawthorne, for the formation of garnet structure. Rietveld refinement results showed that the as-synthesized Li7La3- xZr2O12:xEu3+ phosphors formed a tetragonal crystal structure (I41/acd space group) and emitted efficient red light. The aging of the Li7La3- xZr2O12:xEu3+ phosphors induced a gradual transition from the tetragonal to the cubic structure and formed a secondary phase Li2CO3, which yielded a substantial decrease in PL excitation and emission intensities.
Original language | English |
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Pages (from-to) | 92-98 |
Number of pages | 7 |
Journal | Scripta Materialia |
Volume | 179 |
DOIs | |
Publication status | Published - 2020 Apr 1 |
Externally published | Yes |
Bibliographical note
Funding Information:We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry & Energy (No. 20 184 030 202 260 ).
Funding Information:
We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry & Energy (No. 20184030202260).
Publisher Copyright:
© 2020 Acta Materialia Inc.
Keywords
- Aging
- Crystalline oxides
- Optical properties
- Phosphors
- Powder processing
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys