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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Crystal structure evolution and luminescence properties of color tunable solid solution phosphors Ca2+xLa8-x(SiO4)(6-x)(PO4)(x)O-2:Eu2+
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Crystal structure evolution and luminescence properties of color tunable solid solution phosphors Ca2+xLa8-x(SiO4)(6-x)(PO4)(x)O-2:Eu2+

机译：彩色可调固溶体荧光粉Ca2 + xLa8-x（SiO4）（6-x）（PO4）（x）O-2：Eu2 +的晶体结构演化和发光特性

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摘要

A series of apatite solid solution phosphors Ca2+xLa8-x(SiO4)(6-x)(PO4)(x)O-2: Eu2+ (x = 0,2,4,6) were synthesized by a conventional high-temperature solid-state reaction. The phase purity was examined using XRD, XPS and XRF. The crystal structure information, such as the concentration, cell parameters and occupation rate, was analyzed using a Rietveld refinement, demonstrating that the Eu2+ activated the Ca2La8(SiO4)(6)O-2 and Ca8La2(PO4)(6)O-2 to form continuous solid solution phosphors. Different behaviors of luminescence evolution in response to structural variation were verified among the series of phosphors. Two kinds of Eu2+ ion sites were proved using low temperature PL spectra (8k) and room temperature decay curves. The substitution of large La3+ ions by small Ca2+ ions induced a decreased crystal field splitting of the Eu2+ ions, which caused an increase in emission energy from the 5d excited state to the 4f ground state and a resultant blue-shift from 508 nm to 460 nm. Therefore, with the crystal structure evolution, the emitted color of the series of phosphors could be tuned from green to blue by adjusting the ratio of Ca/La.
机译：通过常规高温合成了一系列磷灰石固溶体荧光粉Ca2 + xLa8-x（SiO4）（6-x）（PO4）（x）O-2：Eu2 +（x = 0,2,4,6）固态反应。使用XRD，XPS和XRF检查相纯度。使用Rietveld精炼法分析了晶体结构信息，例如浓度，晶胞参数和占有率，证明Eu2 +激活了Ca2La8（SiO4）（6）O-2和Ca8La2（PO4）（6）O-2形成连续的固溶体荧光粉。验证了一系列荧光粉之间响应于结构变化的发光演化的不同行为。使用低温PL光谱（8k）和室温衰减曲线证明了两种Eu2 +离子位点。用小的Ca2 +离子代替大的La3 +离子会导致Eu2 +离子的晶体分裂减少，这导致发射能量从5d激发态增加到4f基态，并由此产生从508 nm到460 nm的蓝移。因此，随着晶体结构的演变，可以通过调节Ca / La的比例将一系列荧光粉的发射颜色从绿色调到蓝色。

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