【作者】 乐天； 曾庆光； 张梅； 黄天； 颜强望； 王忆；

【Author】 LE Tian~1 ZENG Qing-guang~(2,*) ZHANG Mei~2 HUANG Tian~2 YAN Qiang-wang~2 WANG Yi~2 (1 School of Chemical and Environmental Engineering,Wuyi University, Guangdong,Jiangmen,529020) (2 School of Applied Physics and Materials,Wuyi University,Guangdong,Jiangmen,529020)

【机构】 五邑大学化学与环境工程学院； 五邑大学应用物理与材料学院；

【摘要】 采用水热法合成2ZnO·2.2B₂O₃·3H₂O:Eu³⁺红色荧光粉。其形貌、结构和光学性能分别用扫描电镜、X-射线衍射和荧光光谱仪进行表征。扫描电镜图片显示样品的尺寸分布在0.1～1μm范围内。X-射线衍射结果表明:所合成的粉末样品的基质材料为2ZnO·2.2B₂O₃·3H₂O;随着Eu掺杂浓度的升高,样品向无定形状态转变。研究样品的激发和发射光谱发现:当激发波长为253 nm(属于Eu³⁺—O^2-电荷迁移带吸收)时,样品中Eu³⁺的发光强度要远远强于394nm激发;当Eu³⁺的掺杂浓度增大到24%（摩尔比:Eu:Zn=24%）时,出现浓度猝灭效应。随着样品退火温度的升高,由X射线衍射谱可知:样品逐渐变成为无定形的玻璃态。当样品的退火温度升高至400℃时,Eu³⁺的发光强度降低,且同时出现了一个新的宽发射峰(发射中心位于470 nm,对应于Eu²⁺的发射峰),这说明了在此温度下部分Eu³⁺被还原成Eu²⁺。更多还原

【Abstract】 A new kind red phosphor,Eu³⁺doped 2ZnO·2.2B₂O₃·3H₂O,has been synthesized by hydrothermal method.The morphology,crystal phase and luminescent properties of zinc borate were investigated by scanning electronic microscopy（SEM）,X-ray diffraction（XRD）and fluorescence spectrometer,respectively.The SEM image shows the particle size of the as-prepared powder is between 0.1 to 1μm.The X-ray diffraction show the matrix of samples is 2ZnO·2.2B₂O₃·3H₂O;the crystalline state of the as-prepared powder is transferred to glass state with the increasing of Eu content.The excitation and emission spectra of Eu-doped 2ZnO·2.2B₂O₃-3H₂O reveals that the emission intensity of Eu excited by 253 nm(the charge transfer band of Eu³⁺)is much stronger than it excited by 394 nm.The optimism doping concentration is 24%（molar ratio Eu:Zn=24%）.Meanwhile,glass state induced by increasing the annealing temperature is observed.When the annealing temperature is up to 400℃,decrease in the emission intensity of Eu³⁺and appearance of a new fluorescence peak assigned to the transition of Eu²⁺（its emission centre at 470 nm）is observed.更多还原