柠檬酸燃烧法制备Gd_3Ga_5O_(12):Eu^(3+)纳米晶及发光性质

Synthesis and Luminescence Properties of Gd_3Ga_5O_(12):Eu^(3+) Nanocrystals by Citric Acid Combustion Method

以柠檬酸为燃烧剂,乙二醇为分散剂,采用燃烧法制备了Gd3Ga5O12∶Eu3+纳米晶。利用X射线衍射仪、扫描电镜和荧光光谱对样品的结构、形貌和发光性能进行了研究。XRD研究结果表明:合成的样品均为单一的Gd3Ga5O12晶相,纳米晶的一次性粒径分布在16～30 nm。发射光谱和激发光谱的研究表明:主发射峰来自于Eu3+的5D0→7F1的跃迁;宽激发带主要来自于Eu-O电荷迁移带。讨论了柠檬酸和乙二醇用量对晶粒尺寸、晶格常数、发射和激发强度的影响。结果表明:过量的柠檬酸和适量的乙二醇有利于晶体发育和发光强度的提高。

Gd3Ga5O12： Eu3＋ nanocrystals were prepared by a combustion method, using citric acid （CA） as a fuel agent, glycol as dispersing agent. The structure, morphology and luminescence properties of the samples were studied by XRD, SEM and luminescence spectrum. The results of XRD indicated that Gd3Ga5O12： Eu3＋nanocrystals with cubic phase could be obtained. The average erystallite size could be calculated as 16-30 nm by Scherrer equation. The results of emission spectra and excitation spectra show that the main emission peaks originated from 5D0→7F1 of Eu3＋ ; the broad excitation bands is mainly assigned to charge transfer band of Eu-O. The effects of the quantities of citric acid and glycol on crystallite size, lattice constant, emission and excitation intensity were discussed. The results show that it is favorable for the crystal growth and improvement of luminescence intensity to excess of citric acid and appropriate glycol.