用于发光二极管的 Eu(3+) 掺杂 Na3Gd(PO4)2 红色发光纳米磷光体的发光特性

Luminescence properties of Eu(3)(+)-doped Na3Gd(PO4)2 red-emitting nanophosphors for LEDs.

作者信息

Chengaiah T, Jamalaiah B C, Rama Moorthy L

机构信息

Department of Physics, Sri Venkateswara University, Tirupati 517 502, India.

Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, University Campus, 3810-193 Aveiro, Portugal.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2014 Dec 10;133:495-500. doi: 10.1016/j.saa.2014.05.089. Epub 2014 Jun 12.

DOI:10.1016/j.saa.2014.05.089

PMID:24973791

Abstract

Eu(3+)-doped Na3Gd(PO4)2 phosphors were synthesized by the modified citrate gel combustion technique. From the XRD pattern, structure of the compound was found to be orthorhombic with a particle size of 10-20nm. The emission spectra revealed that the Na3Gd(PO4)2:Eu(3+) phosphors can be excited effectively by 394nm pump wavelength. From the concentration dependent photoluminescence studies, the optimum concentration for efficient luminescence of Eu(3+) ions in Na3Gd(PO4)2 phosphor has been found to be 1.5mol%. Decay curves of the (5)D0 level of Eu(3+) ions were recorded by monitoring the emission at 596nm corresponding to (5)D0→(7)F1 transition and are found to be single exponential for all the concentrations. The chromaticity properties for different concentrations of Na3Gd(PO4)2:Eu(3+) nanophosphors were calculated from emission spectra and analyzed in the frame work of CIE color diagram.

摘要

采用改进的柠檬酸盐凝胶燃烧法合成了Eu(3+)掺杂的Na3Gd(PO4)2荧光粉。通过XRD图谱发现，该化合物的结构为正交晶系，粒径为10-20nm。发射光谱表明，Na3Gd(PO4)2:Eu(3+)荧光粉在394nm泵浦波长下能被有效激发。通过浓度依赖的光致发光研究发现，Na3Gd(PO4)2荧光粉中Eu(3+)离子高效发光的最佳浓度为1.5mol%。通过监测对应于(5)D0→(7)F1跃迁的596nm处的发射，记录了Eu(3+)离子(5)D0能级的衰减曲线，发现所有浓度下均为单指数衰减。根据发射光谱计算了不同浓度的Na3Gd(PO4)2:Eu(3+)纳米荧光粉的色度特性，并在CIE色坐标图框架内进行了分析。