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Mechanism of energy transfer in Sr_2CeO_4:Eu~(3+) phosphor

机译:Sr_2CeO_4:Eu〜(3+)荧光粉中的能量转移机理

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Blue-white phosphor Sr_2CeO_4 belongs to a particular class of optical materials whose luminescence is governed by optical transitions associated with the electron charge transfer. The originality of its crystal-lographic structure, a chain-like sequence of luminescent centers, permits an effective transfer of the electronic excitation energy from the host to doped centers. Sr_2CeO_4, pure and doped with Eu~(3+)-ions of different concentrations, was synthesized by the Pechini citrate-gel method. The luminescence spectra and luminescence decay curves of Sr_2CeO_4 and Sr_2CeO_4:Eu~(3+) at 300 and 80 K were investigated. The performed experiments revealed the Forster nonradiative energy transfer under the energy migration condition from the crystal host to the doped europium ions.
机译:蓝白色磷光体Sr_2CeO_4属于一类特殊的光学材料,其发光受与电子电荷转移相关的光学跃迁控制。它的晶体学结构的独创性,即发光中心的链状序列,使电子激发能从主体有效转移到掺杂中心。采用柠檬酸Pechini凝胶法合成了纯Sr_2CeO_4,并掺杂了不同浓度的Eu〜(3+)离子。研究了Sr_2CeO_4和Sr_2CeO_4:Eu〜(3+)在300和80 K时的发光光谱和发光衰减曲线。进行的实验表明,在能量迁移条件下,从晶体主体到掺杂euro离子的Forster非辐射能量转移。

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