Emitting-Color Tunable Phosphors Sr3GaO4F:Ce3+ at Ultraviolet Light and Low-Voltage Electron Beam Excitation

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• 作者：Wanping Chen ; Hongbin Liang ; Bing Han ; Jiuping Zhong ; Qiang Su
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 1, 2009
• 年：2009
• 卷：113
• 期：39
• 页码：17194-17199
• 全文大小：310K
• 年卷期：v.113,no.39(October 1, 2009)
• ISSN：1932-7455

文摘

Sr_3−2xCe_xNa_xGaO₄F phosphors were prepared through a high-temperature solid-state reaction method. Their photoluminescence and cathodoluminescence properties were investigated. Under ultraviolet light and low-voltage electron beam excitation, the phosphors show a typical broad emission of Ce³⁺ and the luminescence color can be tuned in a large gamut from greenish-blue to yellowish-green by changing Ce³⁺ concentration in the range of 0.01−0.30 (x value). Their luminescence behaviors are discussed in terms of Ce³⁺ in two distinct sites. The lowest 5d absorption bands are respectively at 405 and 430 nm for Ce(1)³⁺ [i.e., Ce³⁺ in Sr(1)²⁺ site] and Ce(2)³⁺ [i.e., Ce³⁺ in Sr(2)²⁺ site] centers, while the emissions from relaxed 5d state to ²F_5/2 ground state are respectively at 456 nm for Ce(1)³⁺ and 567 nm for Ce(2)³⁺.