期刊
MATERIALS RESEARCH BULLETIN
卷 44, 期 11, 页码 2099-2102出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2009.07.007
关键词
Nitrides; Optical materials; Electron energy loss spectroscopy (EELS); Optical properties
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
Analyses of newly developed carbon-based boron oxynitride phosphors using an electron energy-loss spectrometer and a spectroflurophotometer were carried out. The results showed that the prepared phosphor powder has covalently bonded boron, nitrogen, and oxygen atoms with a soft carbon framework. Photoluminescence characterization revealed that the resultant phosphor has a direct bandgap transition with defect broadened band edges, resulting in a high quantum efficiency, because the atomic distances of the phosphor are smaller than those of conventional carbon-based boron nitride compounds, which have an indirect bandgap transition and a low quantum efficiency. The atomic distances of the phosphor are smaller owing to the presence of oxygen atoms, which have a higher electron affinity and a smaller covalent bond radius compared with boron, carbon and nitrogen. (C) 2009 Elsevier Ltd. All rights reserved.
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