Chemical and photoluminescence analyses of new carbon-based boron oxynitride phosphors |
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Authors: | Wei-Ning Wang Yutaka Kaihatsu Ferry Iskandar Kikuo Okuyama |
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Affiliation: | aDepartment of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi Hiroshima, 739-8527, Japan |
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Abstract: | 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. |
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Keywords: | A. Nitrides A. Optical materials C. Electron energy loss spectroscopy (EELS) D. Optical properties |
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