期刊
DALTON TRANSACTIONS
卷 41, 期 29, 页码 8861-8868出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt30670k
关键词
-
资金
- National Basic Research Program of China [2010CB327704]
- National Natural Science Foundation of China [NSFC 51172227, 20921002]
Green emitting Li2ZnGeO4:Mn2+ phosphors were synthesized through a high temperature solid-state reaction process. X-Ray diffraction, field emission scanning electron microscopy, photoluminescence (PL) and cathodoluminescence (CL) spectra were utilized to characterize the synthesized samples. Under UV and electron-beam excitation, the pure Li2ZnGeO4 sample shows a blue emission due to defects, while the Li2ZnGeO4:Mn2+ sample exhibits a green emission corresponding to the characteristic transition of Mn2+ (T-4(1)->(6)A(1)). In particular, the CL intensity (brightness) of Li2ZnGeO4:Mn2+ is higher than that of commercial green phosphor ZnO:Zn. In addition, the CL properties of Li2ZnGeO4:Mn2+ phosphor, the dependence of CL intensity on accelerating voltage and filament current, the decay behavior of CL intensity under electron bombardment, and the stability of CIE chromaticity coordinates, have been investigated in detail. The results indicate that the as-prepared Li2ZnGeO4:Mn2+ phosphor has a good CL intensity and CIE coordinate stability with green emission under low-voltage electron beam excitation. Therefore, Li2ZnGeO4:Mn2+ is a promising green phosphor for application in full-color field-emission displays.
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