Ce3+ 和 Tb3+ 共掺杂的 Ba2Ln(BO3)2Cl（Ln=Gd 和 Y）荧光粉中的可调彩色发射用于白光发光二极管。

Color tunable emission in Ce3+ and Tb3+ co-doped Ba2Ln(BO3)2Cl (Ln=Gd and Y) phosphors for white light-emitting diodes.

机构信息

Institute of Photonics & Photon-Technology, National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base) in Shaanxi Province, National Photoelectric Technology and Functional Materials & Application of Science and Technology International Cooperation Base, Northwest University, Xi'an 710069, China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:556-61. doi: 10.1016/j.saa.2013.07.076. Epub 2013 Aug 3.

DOI:10.1016/j.saa.2013.07.076

PMID:23973604

Abstract

Ce(3+) and Tb(3+) co-doped Ba2Ln(BO3)2Cl (Ln=Y and Gd) green emitting phosphors were prepared by solid state reaction in reductive atmosphere. The emission and excitation spectra as well as luminescence decays were investigated, showing the occurrence of efficient energy transfer from Ce(3+) to Tb(3+) in this system. The phosphors exhibit both a blue emission from Ce(3+) and a green emission from Tb(3+) under near ultraviolet light excitation with 325-375 nm wavelength. Emission colors of phosphors could be tuned from deep blue through cyan to green by adjusting the Tb(3+) concentrations. The energy transfer efficiency and emission intensity of Ba2Y(BO3)2Cl:Ce(3+), Tb(3+) precede those of Ba2Gd(BO3)2Cl:Ce(3+), Tb(3+), and the sample Ba2Y(BO3)2Cl:0.03Ce(3+), 0.10Tb(3+) is the best candidate for n-UV LEDs.

摘要

采用还原气氛固相反应法制备了 Ce(3+)和 Tb(3+)共掺杂的 Ba2Ln(BO3)2Cl（Ln=Y 和 Gd）绿色发光荧光粉。研究了它们的发射和激发光谱以及荧光衰减，结果表明在该体系中存在 Ce(3+)到 Tb(3+)的有效能量传递。当用 325-375nm 波长的近紫外光激发时，这些荧光粉同时显示出 Ce(3+)的蓝色发射和 Tb(3+)的绿色发射。通过调节 Tb(3+)浓度，可以将荧光粉的发射颜色从深蓝色调通过青色调调至绿色调。Ba2Y(BO3)2Cl:Ce(3+), Tb(3+)的能量传递效率和发射强度优于 Ba2Gd(BO3)2Cl:Ce(3+), Tb(3+)，其中 Ba2Y(BO3)2Cl:0.03Ce(3+), 0.10Tb(3+)是近紫外 LED 的最佳候选材料。