Zero-thermal-quenching and improved chemical stability of a UCr4C4-type phosphor via crystal site engineering
- Authors
- Viswanath, N. S. M.; Grandhi, G. Krishnamurthy; Huu, Ha Tran; Choi, Hyuk; Kim, Ha Jun; Kim, Seong Min; Kim, Hyun You; Park, Chan-Jin; Im, Won Bin
- Issue Date
- Sep-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Blue-emitting phosphor; Chemical stability; Zero thermal quenching; High-power lighting applications
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.420
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 420
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189174
- DOI
- 10.1016/j.cej.2020.127664
- ISSN
- 1385-8947
- Abstract
- Europium-doped UCr4C4 cuboid phosphors with narrow and tunable emission show promise for application in designing light-emitting diodes with high color purity and thermal stability. Nevertheless, their poor chemical stability bottlenecks their use in lighting applications. Herein, a dual narrow-band blue-emitting Ce3+-doped CsNa2K(Li3SiO4)(4) (CNKLSO) cuboid phosphor with a quantum yield of 80% is synthesized. The dual-band emission is attributed to the occupation of Ce3+ at two distinct sites of CNKLSO, which is consistent with the density functional theory outcomes. Ce3+ doping produces stable emission characteristics, in contrast to Eu2+ incorporation, because of the improved site stability, as realized from bond valence sum calculations. Remarkably, no drop in the emission intensity is observed even at 200 degrees C, making CNKLSO:Ce3+ the first Ce3+-based zero-thermal-quenching phosphor. A CNKLSO:Ce3+-based white light-emitting diode displays an excellent color rendering index (similar to 95) at a high flux current of 1000 mA. The proposed study indicates that Ce3+ doping in other UCr4C4-type oxide phosphors may improve the site stability, which in turn the chemical stability of the phosphor materials can be boosted.
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