A novel blue-emitting Ca2B5O9Br:Eu2+ phosphor prepared by a microwave calcination route
A novel blue-emitting Ca2B5O9Br:Eu2+ phosphor prepared by a microwave calcination route
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DOI：
10.1016/j.matchemphys.2009.08.036
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发表时间：
2010-01-15
影响因子：
4.6
通讯作者：
Wang, Xuefeng
中科院分区：
文献类型：
--
作者：
Xia, Zhiguo;Du, Haiyan;Wang, Xuefeng
采用微波煅烧法合成了一种用于白色发光二极管的蓝色荧光粉Ca 2B 5 O 9 Br：Eu 2+。用X射线衍射（XRD）对荧光粉进行了表征。扫描电子显微镜（SEM）和荧光分光光度计。结果表明，微波煅烧法制备的Ca 2B 5 O 9 Br：Eu 2+荧光粉为棒状，具有单相正交结构。荧光光谱分析表明，Ca 2B 5 O 9 Br：Eu 2+荧光粉在近紫外区（270-420 nm）有一个宽的激发带，在411 nm处有一个主峰位于452 nm的蓝色宽发射带。浓度相关的发射光谱研究表明，Ca 2B 5 O 9 Br：0.03Eu（2+）荧光粉的发光强度最强，两个Eu位发射中心的浓度猝灭是由偶极-偶极相互作用引起的。(C)2009 Elsevier B. V.保留所有权利。
A blue-emitting Ca2B5O9Br:Eu2+ phosphor for white light-emitting diodes was synthesized via a microwave calcination route. The phosphor powders were characterized by X-ray diffraction (XRD). scanning electron microscopy (SEM) and fluorescence spectrophotometer, respectively. The obtained results revealed that the Ca2B5O9Br:Eu2+ phosphor prepared by the microwave calcination route possessed a rod-like morphology with the single phase orthorhombic structure. Based on the photoluminescence analysis, it was found that Ca2B5O9Br:Eu2+ phosphor exhibited a broad excitation band chiefly in the near ultraviolet region (270-420 nm) and a blue broad emission band of main peak at 452 nm under the strongest excitation of 411 nm. Further investigation on concentration-dependent emission spectra indicated that Ca2B5O9Br:0.03Eu(2+) phosphor exhibited the strongest luminescent intensity, and the concentration quenching for the two Eu-site emission centers was caused by dipole-dipole interactions. (C) 2009 Elsevier B.V. All rights reserved.