Controlling of structural ordering and rigidity of β-SiAlON:Eu through chemical cosubstitution to approach narrow-band-emission for light-emitting diodes application
Xuejie Zhang , Mu-Huai Fang , Yi-Ting Tsai , Agata Lazarowska , Sebastian Mahlik , Tadeusz Leśniewski , Marek Grinberg , Wei Kong Pang , Fengjuan Pan , Chaolun Liang , Zhou Wuzong , Jing Wang , Jyh-Fu Lee , Bing-Ming Cheng , Tsu-Lien Hung , Yang-Yuan Chen , Ru-Shi Liu
AbstractNarrow-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.
|Other language title versions|
|Journal series||Chemistry of Materials, ISSN 0897-4756, (A 45 pkt)|
|Publication size in sheets||0.55|
|Score|| = 45.0, 20-12-2017, ArticleFromJournal|
= 45.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 9.466 (2) - 2016=9.242 (5)|
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