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论文类型：期刊论文

发表时间：2017-10-01

发表刊物：JOURNAL OF LUMINESCENCE

收录刊物：SCIE、EI、Scopus

卷号：190

页面范围：457-461

ISSN号：0022-2313

关键字：Tb3+ ions; Zn2GeO4; Green/blue light emission; Energy transfer

摘要：A series of Zn2GeO4:Tb3+ nanophosphors have been prepared by the high temperature solid state method. The XRD patterns of samples are basically consistent with Zn2GeO4 standard card and the influence of Tb3+ ion on the peak shift is discussed detailedly. The SEM results show that the average sizes of all nanophosphors, whether undoped or doped, are about 50 nm except that some particles in Zn2GeO4 nanophosphor doped with 0.7 mol% terbium take on the cubic structure and the maximum size are about 130 nm. Under 265 nm excitation, there exists a broad blue emission belonging to Zn2GeO4 host. Moreover, the intense photoluminescence peaks at 490, 550 rim and weak peaks at 585, 622 nm of Tb3+ ions are obtained, and optimum Tb3+ doping concentration is 0.7 mol%. The decay curves of host emissions with the varied Tb3+ concentrations are measured, and the mechanisms of photoluminescence and energy transfer from Zn2GeO4 host to Tb3+ ions are analyzed systematically.