| Gd3Ga5O12∶Eu3+发光纳米晶的燃烧合成及性质 |
| Combustion Synthesis and Properties of Gd3Ga5O12∶Eu3+ Luminescence Nanocrystals |
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| 摘要: 以尿素为燃烧剂，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、电镜和荧光光谱对前驱体和热处理后样品的结构、形貌和发光性能进行了表征。XRD结果表明：700 ℃热处理2 h即可获得立方结构Gd3Ga5O12∶Eu3+纳米晶。根据Scherrer 公式估算经700 ℃和900 ℃热处理2 h获得的纳米晶的一次性粒径分别为28 nm和42 nm。发射光谱和激发光谱的结果表明：特征发射峰来自于5D0-7FJ跃迁，而来自于Eu3+的5D0→7F1的磁偶极跃迁发射最强；宽激发带主要来自于Eu-O电荷迁移带和Gd3Ga5O12基质吸收。发射强度和激发强度随热处理温度的提高而增强。 |
| 关键词: 燃烧法 Gd3Ga5O12∶Eu3+纳米晶 激发光谱 发射光谱 |
| 基金项目: |
| Abstract: Gd3Ga5O12∶Eu3+ nanocrystals were prepared by a combustion method using urea as fuel agent and glycol as dispersing agent. The structure, morphology and luminescence properties of the precursors and the samples after heat treatment were characterized by XRD, SEM and luminescence spectroscopy. The results of XRD indicated that Gd3Ga5O12∶Eu3+ nanocrystals with cubic phase could be obtained by annealing precursor at 700 ℃ for 2 h. The average crystallite size by using the Scherrer equation is 28 nm and 42 nm for samples annealed at 700 ℃ and 900 ℃, respectively. The results of excitation spectra and emission spectra showed that the emission peaks were ascribed to 5D0-7FJ tranisition, and the magnetic dipole transition originated from 5D0→7F1 of Eu3+ was the strongest, the broad excitation bands belonged to charge transfer band of Eu-O and the host absorption of Gd3Ga5O12. The intensities of emission and excitation increased with increase in annealing temperature. |
| Keywords: combustion method Gd3Ga5O12∶Eu3+ nanocrystals excitation spectrum emission spectrum |
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| 李艳红,陆海燕,张永明,刘 茜.Gd3Ga5O12∶Eu3+发光纳米晶的燃烧合成及性质[J].无机化学学报,2011,27(3):533-536. |
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