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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Optical properties and energy transfer of a novel KSrSc2(PO4)(3):Ce3+/Eu2+/Tb3+ phosphor for white light emitting diodes
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Optical properties and energy transfer of a novel KSrSc2(PO4)(3):Ce3+/Eu2+/Tb3+ phosphor for white light emitting diodes

机译：新型KSrSc2（PO4）（3）：Ce3 + / Eu2 + / Tb3 +荧光粉用于白色发光二极管的光学性质和能量转移

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摘要

A new langbeinite-type phosphate KSrSc2(PO4)(3) has been synthesized by conventional high temperature solid state reaction. Rietveld structure refinement, a field emission scanning electron microscope, photoluminescence spectra, quantum efficiency as well as lifetimes were used to characterize the samples. Structure refinement reveals that KSrSc2(PO4)(3) has two kinds of Sr2+ and Sc3+ sites for the doped ions to occupy, forming emission centers. The KSrSc2(PO4)(3):Ce3+ and KSrSc2(PO4)(3): Eu2+ phosphors both have broad excitation and emission bands due to spin-and orbit-allowed electron transitions. Phosphors with tunable blue to blue-green colors were obtained by codoping the Tb3+ ions into the KSrSc2(PO4)(3):0.03Ce(3+) and KSrSc2(PO4)(3):0.03Eu(2+) phosphors with varying contents. The mechanism of Eu2+ --> Tb3+ energy transfer is determined to be a dipole-quadrupole interaction in terms of the experimental results and analysis of photoluminescence spectra and decay curves of the phosphors by using the Inokuti-Hirayama theoretical model. Our prepared KSrSc2(PO4)(3):Ce3+, Tb3+ and KSrSc2(PO4)(3):Eu2+, Tb3+ phosphors are of potential value for UV excited WLEDs.
机译：通过常规的高温固相反应合成了一种新型的贝贝石型磷酸盐KSrSc2（PO4）（3）。使用Rietveld结构改进，场发射扫描电子显微镜，光致发光光谱，量子效率以及寿命来表征样品。结构细化表明，KSrSc2（PO4）（3）具有两个Sr2 +和Sc3 +位点，以供掺杂离子占据，从而形成发射中心。由于自旋和轨道允许的电子跃迁，KSrSc2（PO4）（3）：Ce3 +和KSrSc2（PO4）（3）：Eu2 +荧光粉均具有宽的激发和发射带。通过将Tb3 +离子共掺杂到KSrSc2（PO4）（3）：0.03Ce（3+）和KSrSc2（PO4）（3）：0.03Eu（2+）荧光粉中，获得具有可调蓝色至蓝绿色的荧光粉内容。根据实验结果以及使用Inokuti-Hirayama理论模型对磷光体的光致发光光谱和衰减曲线进行分析，确定Eu2 +-> Tb3 +的能量转移机理为偶极-四极相互作用。我们制备的KSrSc2（PO4）（3）：Ce3 +，Tb3 +和KSrSc2（PO4）（3）：Eu2 +，Tb3 +荧光粉对于紫外线激发的WLED具有潜在价值。

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