摘要
以Eu2O3(99.99%),CaCl2.6H20(AR),Na2WO4.2H2O(AR)为原料,水热合成Eu3+掺杂的CaWO4系列荧光粉,通过XRD、荧光光谱等表征手段,考察荧光粉的晶体结构和三价铕离子的掺杂量对荧光粉体发光性能的影响.研究表明:由于Eu3+半径与Ca2+半径大小相当,Eu3+掺杂的CaWO4荧光粉并未引起其晶体结构的较大变化;在395 nm激发下,荧光粉Ca1-xWO4∶xEu3+的基质CaWO4由于WO42-内部的电荷跃迁产生主峰位于464 nm附近的宽带峰,掺杂的Eu3+分别在590 nm、616 nm处出现对应于Eu3+的5D0→7F15、D0→7F2跃迁的特征发射峰.随着Eu3+浓度的增加,616 nm红光发射强度增强,当Eu3+掺杂量为0.3%时,Ca1-xWO4∶xEu3+在395 nm激发下可得到接近白光效果的荧光发射,其对应的CIE色坐标为X=0.3602,Y=0.3528.
Eu2 O3 (99.99 % ), C1-aCl2 · 6H2O(AR), Na2WO4·2H2 O(AR) were used as the starting mate- rials, and all of them were of analytical grade without any further purificationl Ca1-xWO4: xEu〉 phos- phors were synthesized via hydrothermal method. The crystal structure and luminescent properties of the phosphors were studied by XRD(X-ray powder diffraction)and fluorescence patterns. The results showed that the structure of Eu3+ - doped phosphors had little difference with purecalcium tungstate because the radius of Eu3+ and Ca2~ had little difference;When Cat.xWO4 :xEu3. samples were excited by 395 nm, the base part CaWO4 exhibited a wide emission band with a maximum at 464 nm originating from the charge transfer transition between W6+ -02. bond of WOa2- groups, while the Eu3+ions showed characteristic emissions at 590 nm and 616 nm due to 5D0→7 F1 and SD0→7 F2 transition, respectively. The intensity of red emission at 616 nm was enhanced by increasing the concentration of Eu3+ , and a white emission spectrum was obtained when the concentration of Eu3+ was tuned to 0.3%, the corresponding CIE was X=0. 360 2 and Y=0.3528.
出处
《广西师范学院学报(自然科学版)》
2010年第1期45-48,66,共5页
Journal of Guangxi Teachers Education University(Natural Science Edition)
基金
广西自然科学基金资助项目(桂科自0728101
0640203)