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首页> 外文期刊>ECS Journal of Solid State Science and Technology >Photoluminescence Characteristics of Eu~(3+)-Doped Double-Perovskite Phosphors
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Photoluminescence Characteristics of Eu~(3+)-Doped Double-Perovskite Phosphors

机译：Eu〜（3+）掺杂双钙钛矿型荧光粉的光致发光特性

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摘要

Eu~(3+)-doped triple tellurium double perovskites LiBaLalTeO_6], NaBaLa[TeO_6], LiBaBi[TeO_6] and NaCaBi[TeO_6] were synthesized by the general high temperature solid-state reaction. The crystal phase formations and morphology of the phosphates were confirmed by X-ray powder diffraction (XRD) and scanning electron microscope (SEM) measurements, respectively. The luminescence properties, including the photoluminescence (PL) excitation and emission spectra, decay curves (lifetimes), the color coordinates and the internal quantum efficiency (QE) were investigated. Eu~(3+)-doped LiBaLa[TeO_6], NaBaLa[TeO_6], and LiBaBi[TeO_6] show the dominated electric dipole transition ~5D_0→~7F_2 with a pure red luminescence color and a fast decay. However, Eu~(3+)-doped NaCaBi[TeO_6] presents the dominant reddish-orange emission from magnetic dipole transition ~5D_0→~7F_1 and a longer luminescence lifetime. The different luminescence features were discussed on the base of crystal structure, where Eu~(3+) ions have two possible substitutions on A or B sites in double tellurium perovskites.
机译：通过普通的高温固相反应合成了（3+）掺杂的三碲双钙钛矿LiBaLalTeO_6，NaBaLa [TeO_6]，LiBaBi [TeO_6]和NaCaBi [TeO_6]。分别通过X射线粉末衍射（XRD）和扫描电子显微镜（SEM）测量来确认磷酸盐的晶相形成和形态。研究了发光性质，包括光致发光（PL）激发和发射光谱，衰减曲线（寿命），色坐标和内部量子效率（QE）。掺杂Eu〜（3+）的LiBaLa [TeO_6]，NaBaLa [TeO_6]和LiBaBi [TeO_6]表现出主导的电偶极跃迁〜5D_0→〜7F_2，具有纯红色的发光颜色和快速衰减。然而，掺有Eu〜（3+）的NaCaBi [TeO_6]呈现出从磁偶极跃迁〜5D_0→〜7F_1产生的主要的红橙色发射，并具有更长的发光寿命。在晶体结构的基础上讨论了不同的发光特征，其中Eu〜（3+）离子在双碲钙钛矿中的A或B位有两个可能的取代。

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