https://scholars.lib.ntu.edu.tw/handle/123456789/407334
Title: | Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light-emitting diodes | Authors: | Lu C.-H. Yang C.-Y. Som S. Das S. |
Keywords: | chemical vapor deposition;spectroscopic characterization;white light-emitting diode | Issue Date: | 2018 | Journal Volume: | 101 | Journal Issue: | 11 | Start page/Pages: | 4916-4920 | Source: | Journal of the American Ceramic Society | Abstract: | A modified chemical vapor deposition (CVD) technique is used to synthesize the color-tunable siliconitride Sr2-1.5x-yCexEuySi5N8 (x?=?0.000-0.016 and y?=?0.000-0.020) phosphors. In comparison with the conventional solid-state method, the CVD approach successfully improved the crystallinity, particle size distribution, and photoluminescence through the enhanced gas-solid reaction. Under blue excitation, Sr1.98Eu0.02Si5N8 exhibited a red emission band at 618?nm. The incorporation of Ce3+ ions increased the emission intensity of Eu2+ ions by approximately 10% owing to the enhanced absorption and dipole-dipole energy transfer process from Ce3+ to Eu2+ ions. It resulted in a shift of the emission colors from yellow to red region. The external and internal quantum efficiencies of Sr1.906Ce0.06Eu0.004Si5N8 were calculated as 54% and 70%, respectively. The activation energy of thermal stability for Sr1.906Ce0.06Eu0.004Si5N8 was evaluated as 0.31?eV. A white LED with a color rendering index of 80 and a CCT of 4964?K was successfully fabricated with the present phosphors. The current research demonstrated a new series of Sr2Si5N8:Ce3+, Eu2+ phosphors with color-tunability for fabricating white LEDs with high color-rendering index. ? 2018 The American Ceramic Society |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407334 | ISSN: | 00027820 | DOI: | 10.1111/jace.15914 |
Appears in Collections: | 化學工程學系 |
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