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新型单相红色发光磷光体CaSr(PO):Sm,Li的制备、晶体结构及发光性能

Preparation, crystal structure and luminescence properties of a novel single-phase red emitting phosphor CaSr(PO):Sm,Li.

作者信息

Chen Yuying, Guo Qingfeng, Liao Libing, He Mingyue, Zhou Tianshuai, Mei Lefu, Runowski Marcin, Ma Bin

机构信息

School of Gemology, China University of Geosciences Beijing 100083 China

Jewelry and Mineral Materials Laboratory of Experimental Teaching Demonstration Center Beijing China.

出版信息

RSC Adv. 2019 Feb 8;9(9):4834-4842. doi: 10.1039/c9ra00264b. eCollection 2019 Feb 5.

DOI:10.1039/c9ra00264b
PMID:35514613
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9060601/
Abstract

Single-phase CaSr(PO):Sm,Li phosphors were prepared a high-temperature solid-state method under air. The powder X-ray diffraction patterns, scanning electron microscopy images, photoluminescence spectra, and concentration-dependent emission spectra were measured to characterize the as-prepared phosphors and luminescence decay curves. The results showed that the CaSr(PO):Sm,Li phosphors exhibited red luminescence, and the emission spectra of the phosphors consisted of four sharp peaks at around 565, 601 (the strongest one), 647 and 707 nm. The optimum doping concentration of Sm ions was 0.09 (mol concentration), and the mechanism of energy transfer among Sm ions was defined to be quadrupole-quadrupole (q-q) interactions using Dexter's theory. The Blasse concentration quenching method was used to determine the critical distance for energy transfer among Sm as 10.99 Å. The results indicate that the as-prepared phosphors have good thermal stability with an activation energy of 0.773 eV temperature-dependent emission spectra. Therefore, CaSr (PO):Sm,Li materials can be used as red-emitting phosphors for UV-pumped white-light emitting diodes.

摘要

采用高温固相法在空气中制备了单相CaSr(PO₄)₂:Sm³⁺,Li⁺荧光粉。通过测量粉末X射线衍射图谱、扫描电子显微镜图像、光致发光光谱、浓度依赖发射光谱来表征所制备的荧光粉，并测量了发光衰减曲线。结果表明，CaSr(PO₄)₂:Sm³⁺,Li⁺荧光粉呈现红色发光，其发射光谱由位于565、601（最强峰）、647和707 nm附近的四个尖锐峰组成。Sm³⁺离子的最佳掺杂浓度为0.09（摩尔浓度），利用德克斯特理论确定Sm³⁺离子间的能量转移机制为四极 - 四极（q - q）相互作用。采用布拉斯浓度猝灭法确定Sm³⁺间能量转移的临界距离为10.99 Å。结果表明，所制备的荧光粉具有良好的热稳定性，根据温度依赖发射光谱得出其激活能为0.773 eV。因此，CaSr(PO₄)₂:Sm³⁺,Li⁺材料可作为紫外泵浦白光发光二极管的红色发光荧光粉。

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