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白光LED具有广阔的应用前景与市场需求，而红色荧光粉对改善器件性能至关重要。本文采用高温固相法制备了一系列Li2Gd4-xSmx(MoO4)7(x=0.01-0.13)荧光粉，利用X射线衍射、扫描电子显微镜、X射线光电子能谱和荧光光谱仪对样品进行了表征。在406 nm激发下，Li2Gd4(MoO4)7:Sm3+荧光粉的发射峰分别位于563、598、645、706 nm处，这是由于Sm3+的4f-4f跃迁引起的。当Sm3+浓度为0.07时发光最强，浓度猝灭主要归因于电偶极-电偶极相互作用。随着Sm3+浓度的增加，荧光寿命逐渐缩短。在温度依赖性发射光谱的研究中，发现423 K时Li2Gd4(MoO4)7:0.07Sm3+的发射强度依然保持在298 K时的79%，显示了样品优良的热稳定性。CIE色度图确认了该荧光粉的发射位于橙红色区域。进一步利用最佳样品制作了白光LED，其CIE色坐标为(0.3788,0.3134)，位于白光圈内。研究表明Li2Gd4(MoO4)7:Sm3+荧光粉是一种很有前途的白光LED用橙红色荧光粉。White LEDs have a broad application prospects and market demand, while the red phosphor play a big impact on the color temperature and color rendering index of the modulated white light. In this paper, a series of Li2Gd4-xSmx(MoO4)7(x=0.01-0.13) phosphors were prepared by high temperature solid phase method. The successful doping of Sm3+ into Li2Gd4(MoO4)7 was confirmed by X-ray diffractometry (XRD) and did not result in any change in crystal structure. The samples were detected by scanning electron microscope (SEM) as irregular blocky structures with particle size less than 20μm. The presence of Li, Gd, Mo, O and Sm elements in the phosphor was confirmed by energy dispersive X-ray spectroscopy (EDS). X-ray photoelectron spectroscopy (XPS) studies showed that the activator was successfully doped into materials. Under 406 nm excitation, the emission peaks of the sample are located at 563, 598, 645 and 706nm respectively, which are caused by the 4f-4f transition of Sm3+and the strongest emission peak comes from 4G5/2→6H9/2 transition. It was found that optimal concentration of Sm3+ is 0.07. With the increase of Sm3+ concentration, the fluorescence lifetime decreases gradually. The temperature-dependent emission of phosphor was also studied. The emission intensity at 473 K was still 79% of that at 298 K, indicating that the sample had excellent heat resistance. The CIE chromaticity diagram shows the luminescence of the prepared phosphor is located in the orange-red region and the color purity is high (99%). Moreover, a white LED is manufactured using the optical doped phosphor, which has CIE coordinates of (0.3788, 0.3134) and is located in the circle of white light. Research shows that Li2Gd4(MoO4)7: Sm3+ phosphor is a promising orange-red phosphor for white LEDs.
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Keywords:
- phosphors /
- luminescent property /
- LED /
- Sm3+
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