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• 作者：Dongling Geng ; Mengmeng Shang ; Yang Zhang ; Hongzhou Lian ; Jun Lin
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 2, 2013
• 年：2013
• 卷：52
• 期：23
• 页码：13708-13718
• 全文大小：871K
• 年卷期：v.52,no.23(December 2, 2013)
• ISSN：1520-510X

文摘

A series of single-phase phosphors based on KNaCa₂(PO₄)₂ (KNCP):A (A = Ce³⁺, Eu²⁺, Tb³⁺, Mn²⁺, Sm³⁺) have been prepared via the Pechini-type sol鈥揼el method. Photoluminescence (PL) and cathodoluminescence (CL) properties of Ce³⁺-, Eu²⁺-, Tb³⁺-, Mn²⁺-, and Sm³⁺-activated KNCP phosphors were investigated. For the A singly doped KNCP samples, they exhibit the characteristic emissions of the A activator. Na⁺ ions exhibit the best charge compensation result among Li⁺, Na⁺, and K⁺ ions for Ce³⁺-, Tb³⁺-, and Sm³⁺-doped KNCP samples. The energy transfers from Ce³⁺ to Tb³⁺ and Mn²⁺ ions as well as Eu²⁺ to Tb³⁺ and Mn²⁺ have been validated. The emission colors of KNCP:Ce³⁺/Eu²⁺, Tb³⁺/Mn²⁺, Na⁺ samples can be adjusted by energy transfer process and changing the Tb³⁺/Mn²⁺ concentration. More importantly, white light emission in KNCP:Eu²⁺, Mn²⁺ system has been obtained. The KNCP:Tb³⁺, Na⁺ sample shows tunable luminescence from blue to cyan and then to green with the change of Tb³⁺ concentration due to the cross-relaxation from ⁵D₃ to ⁵D₄. A white emission can also be realized in the single-phase KNCP host by reasonably adjusting the doping concentrations of Tb³⁺ and Sm³⁺ (reddish-orange emission) under low-voltage electron beam excitation. Additionally, the temperature-dependent PL properties of as-prepared phosphors reveal that the KNCP host has good thermal stability. Therefore, the KNCP:A (A = Ce³⁺, Eu²⁺, Tb³⁺, Mn²⁺, Sm³⁺) phosphors could be regarded as good candidates for UV W-LEDs and FEDs.