Chemistry of Materials
Chemistry of Materials
5 years ago

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application
Tadeusz Lesniewski, Bing-Ming Cheng, Jyh-Fu Lee, Jing Wang, Agata Lazarowska, Tsu-Lien Hung, Chaolun Liang, Wuzong Zhou, Marek Grinberg, Mu-Huai Fang, Sebastian Mahlik, Yi-Ting Tsai, Fengjuan Pan, Wei Kong Pang, Yang-Yuan Chen, Xuejie Zhang, Ru-Shi Liu
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.

Publisher URL: http://dx.doi.org/10.1021/acs.chemmater.7b01697

DOI: 10.1021/acs.chemmater.7b01697

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