期刊
SOLID STATE SCIENCES
卷 26, 期 -, 页码 115-120出版社
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2013.10.004
关键词
Phosphors; Solid-state lighting; Microwave preparation; Sodium yttrium silicate
资金
- ConvEne IGERT Program [NSF-DGE 0801627]
- MRL-RISE summer internship program
- MRSEC Program of the NSF [DMR 1121053]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
The preparation of two cerium-substituted sodium yttrium silicate phosphors, NaY9Si6O26:Ce3+ and Na3YSi2O7:Ce3+, was achieved using rapid heating via a modified microwave-assisted preparation technique. Activated carbon is used as a microwave susceptor allowing reaction temperatures greater than 1000 degrees C to be reached in minutes while producing the reducing atmosphere necessary to achieve Ce3+. Because this method immediately heats the sample and does not employ a H-2/N-2 gas mixture to maintain Ce3+ in its reduced state, volatilization of starting materials is limited, allowing the products to be prepared from a stoichiometric mixture of starting materials. The samples prepared were characterized using synchrotron X-ray powder diffraction and fluorescence spectroscopy. Photoluminescence measurements indicate NaY9Si6O26:Ce3+ contains a broad excitation band in the UV ranging between 280 nm and 330 nm that produces a blue emission between 350 nm and 500 nm with a 10% quantum yield. Na3YSi2O7:Ce3+ has a strong absorption band at 350 nm and also emits in the blue (375 nm 500 nm) with a quantum yield of 28%. (C) 2013 Elsevier Masson SAS. All rights reserved.
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