https://scholars.lib.ntu.edu.tw/handle/123456789/575857
標題: | Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application | 作者: | Zhang X RU-SHI LIU et al. |
關鍵字: | Aluminum; Emission spectroscopy; Light emission; Light emitting diodes; Phosphors; Rigidity; Crystal field strength; Electron-lattice coupling; Electronic transition; Excitation wavelength; Green-emitting phosphors; Higher-order structure; Inhomogeneous broadening; Photoluminescence emission; Europium | 公開日期: | 2017 | 卷: | 29 | 期: | 16 | 起(迄)頁: | 6781-6792 | 來源出版物: | Chemistry of Materials | 摘要: | Narrow-band green-emitting phosphor β-SiAlON:Eu has been widely used in advanced wide-gamut backlighting devices. However, the origins for unusual sharp lines in photoluminescence emission at room temperature and tunable narrow-band-emission tailored by reducing Al-O in β-SiAlON:Eu are still unclear. Here, the presence of sharp-line fine structure in the emission spectra of β-SiAlON:Eu is mainly due to purely electronic transitions (zero phonon lines), and their vibronic repetitions resulting from the multimicroenvironment around Eu2+ ions that has been revealed by relative emission intensity of sharp line depends on excitation wavelength and monotonously increasing decay time. The specific features of the Eu2+ occupying interstitial sites indicate that the effect of crystal field strength can be neglected. Therefore, the enhanced rigidity and higher ordering structure of β-SiAlON:Eu with decreasing the substitution of Si-N by Al-O become the main factors in decreasing electron-lattice coupling and reducing inhomogeneous broadening, favoring the blue-shift and narrow of the emission band, the enhanced thermal stability, as well as the charge state of Eu2+. Our results provide new insights for explaining the reason for narrow-band-emission in β-SiAlON:Eu, which will deliver an impetus for the exploration of phosphors with narrow band and ordering structure. ? 2017 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027865540&doi=10.1021%2facs.chemmater.7b01697&partnerID=40&md5=fcf225042f9b6f33d947e6c1f335b609 https://scholars.lib.ntu.edu.tw/handle/123456789/575857 |
ISSN: | 8974756 | DOI: | 10.1021/acs.chemmater.7b01697 |
顯示於: | 化學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。