Journal
CHEMISTRY OF MATERIALS
Volume 28, Issue 13, Pages 4829-4839Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b02109
Keywords
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Funding
- JSPS KAKENHI [15K06448]
- National Natural Science Foundation of China [51272259, 61575182, 51572232, 51561135015]
- Key Technology Research and Development Program of Ningbo [2011B1001]
- China Scholarship Council
- Supercomputing Center of USTC
- Grants-in-Aid for Scientific Research [15K06448] Funding Source: KAKEN
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Luminescent materials play an important role in making solid state white light-emitting diodes (w-LEDs) more affordable home lighting applications. To realize the next generation of solid-state w-LEDs with high color-rendering index (CRI), the discovery of broad band and long emission wavelength luminescent materials is an urgent mission. Regarding this, the oxonitridosilicate Y3Si5N9O with a high nitrogen concentration should be a suitable host material to achieve those promising luminescent properties. In this work, a phase-pure Ce3+-doped Y3Si5N9O was successfully synthesized through the carbothermal reduction and nitridation method. Y3Si5N9O:Ce3+ shows an emission maximum at 620 nm and an extremely broad emission band with a full-width at half-maximum (fwhm) of 178 nm. The electronic and crystal structure calculations indicate an indirect band gap of 2.6 eV (experimental value: 4.0 eV), and identify two Ce3+ sites with different local environments that determine the luminescence properties. The orange-emitting phosphor has the absorption, internal and external quantum efficiencies of 89.5, 17.2, and 15.6% under 450 nm excitation, respectively. The valence state of Ce, cathodoluminescence, decay time, and thermal quenching of the phosphor were also investigated to understand the structure-property relationships.
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