【摘要】 目的研究退火温度、薄膜层数等制备工艺对发光特性的影响。方法以钛酸丁酯为前驱体,采用溶胶-凝胶法制备稀土Eu,Tb掺杂的TiO2发光干凝胶和薄膜,用紫外-可见荧光分光光度计进行表征。结果 Eu3+单掺样品,用545nm波长光激发时,在618nm处有较强的Eu3+的5D0→7F2跃迁的红光发射,其跃迁强度随着退火温度的升高先增强后减弱,600℃时达到最大值。另外,薄膜的跃迁强度随着薄膜层数的增加先增强再减弱,提拉速度为8cm/min时,19层膜的荧光强度最佳。结论 Eu,Tb共掺干凝胶,以251nm作为激发波长,发射光谱在370～520nm出现了很宽的谱带,谱带中435nm和469nm两个肩峰,认为该发射峰是Eu2+的4f→5d跃迁发射引起的,退火温度在850℃时蓝光发射最强。更多还原

【Abstract】 Aim To study the effects of the annealing temperature,the layer number of films on the luminescence properties. Methods With butyl titanateas precursor,TiO2 luminescent xerogels and thin films doped with Eu and Tb ions were prepared by sol-gel technique. The samples were characterized by the UV-Vis spectrophotometer. Results Under 545nm excitation the emission spectra of Eu3+ doped sample were consisted of a peak located at 618nm,which responded to the 5D0 →7F2 transition of Eu3 + ions. The transition intensity is increased with the weakening annealing temperature after the first increase at 600℃. As to the layer number of films,the same tendency was found. When the hoist speed was 8cm/min and the films’layer number was 19,the transition intensity is increased to maximum. Conclusion To the sample of Tb and Eu co-doped nano-powders,a broad emitting spectra band lay between 370nm to 520nm gained under the excitation of 251nm,in which double peaks,caused by the transition of Eu2 + from 4f to 5d,appeared at 435nm and 469nm. When the annealing temperature was 850℃,the strongest emitting intensity obtained.更多还原