Optimization and luminescence studies of Sm3+ doped LiCaBO3 phosphors for high-performance white light-emitting diodes

IF 3.8 Q2 CHEMISTRY, PHYSICAL
Manta Sharma , Hritiksha Sharma , Isha Charak , H.C. Swart , Vinay Kumar
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Abstract

An undoped and a series of orange-red emitting LiCaBO3:Sm3+ (x = 0.5–3 mol%) phosphors have been synthesized using a highly reliable and cost-effective combustion method. The synthesized phosphors were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), photoluminescence spectroscopy (PL), and Diffuse Reflectance spectroscopy (DRS). The structural studies of the LiCaBO3:Sm3+phosphor confirm the single-phase orthorhombic structure with space group Pbca and the presence of borate anionic groups. Upon near-UV excitation at 405 nm, the PL emission spectra show four emission peaks centered at 564 nm, 602 nm, 650 nm, and 708 nm corresponding to the 4G5/26H5/2, 4G5/26H7/2, 4G5/26H9/2 and 4G5/26H11/2 transitions respectively resulting in the emission of orange-red light. The optimum dopant concentration of Sm3+ion was 1 mol% and the main mechanism of concentration quenching was calculated using Dexter's theory. The bandgap of the undoped phosphor was found to be 5.31 eV. The CIE chromaticity coordinates are (0.56, 0.40) which confirms the orange-red emission. The obtained results indicate that the synthesized phosphor can be a potential candidate for application in solid-state lighting devices.

Abstract Image

用于高性能白光发光二极管的 Sm3+ 掺杂 LiCaBO3 荧光粉的优化和发光研究
采用一种高度可靠且经济高效的燃烧法合成了一种未掺杂的和一系列橙红色发光的 LiCaBO3:Sm3+ (x = 0.5-3 mol%)荧光粉。利用 X 射线衍射 (XRD)、傅立叶变换红外光谱 (FTIR)、光致发光光谱 (PL) 和漫反射光谱 (DRS) 对合成的荧光粉进行了表征。对 LiCaBO3:Sm3+ 磷酸盐的结构研究证实,它具有空间群为 Pbca 的单相正方体结构,并存在硼酸盐阴离子基团。在 405 nm 波长的近紫外光激发下,PL 发射光谱显示出以 564 nm、602 nm、650 nm 和 708 nm 为中心的四个发射峰,分别对应于 4G5/2 → 6H5/2、4G5/2 → 6H7/2、4G5/2 → 6H9/2 和 4G5/2 → 6H11/2 转变,从而发射出橙红色光。Sm3+ 离子的最佳掺杂浓度为 1 摩尔%,并利用 Dexter 理论计算了浓度淬灭的主要机制。未掺杂荧光粉的带隙为 5.31 eV。CIE 色度坐标为 (0.56,0.40),这证实了橙红色发射。这些结果表明,合成的荧光粉有望应用于固态照明设备。
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来源期刊
Chemical Physics Impact
Chemical Physics Impact Materials Science-Materials Science (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
65
审稿时长
46 days
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