无机化学学报

Er³⁺/Yb³⁺共掺纳米In₂O₃的制备及上转换发光

Synthesis and Upconversion Luminescence of Er³⁺/Yb³⁺ Co-doped In₂O₃ Nanocrystals

作者	单位
邹少瑜	暨南大学化学系，广州 510632
孟建新	暨南大学纳米化学研究所，广州 510632

摘要: 用低温溶剂热法以乙二醇为溶剂合成了Er³⁺和Yb³⁺共掺的In₂O₃纳米晶。用X射线衍射(XRD)、透射电镜(TEM)、漫反射光谱和上转换发光光谱对样品进行了分析。XRD和TEM结果表明，产物为纯的立方相In₂O₃结构，粒径约为30 nm；漫反射光谱显示了In₂O₃∶Er³⁺，Yb³⁺纳米晶在522、653和975 nm附近有3个吸收带；在980 nm近红外光激发下，样品发射出中心波长为525及555 nm的绿光和662 nm的红光，分别对应于Er³⁺的²H_11/2→⁴I_15/2、⁴S_3/2→⁴I_15/2和⁴F_9/2→⁴I_15/2跃迁；研究了Er³⁺和Yb³⁺离子的不同掺杂浓度对发光强度的影响，确定了Yb³⁺和Er³⁺离子的最佳掺杂浓度均为3%；双对数曲线显示绿光和红光的发射过程均为双光子吸收过程，对样品的上转换发光机制进行了初步讨论。

关键词: 溶剂热法上转换纳米晶 In₂O₃∶Er³⁺，Yb³⁺

基金项目:

Abstract: Nanocrystals of up-conversion phosphor Er³⁺ and Yb³⁺ co-doped In₂O₃ were prepared by solvent thermal method using glycol as solvent. The samples were characterized by X-ray diffraction, transmission electron microscopy, diffuse reflectance spectra, and upconversion luminescence spectra. X-ray diffraction analysis showed that the products were pure cubic phase，while transmission electron microscopy measurements confirmed the particles size was about 30 nm. The diffuse reflectance spectra indicated that Er³⁺/Yb³⁺ co-doped In₂O₃ nanocrystals have three absorption bands around 522, 653 and 975 nm. Under 980 nm excitation, the spectral peaks centered at 525, 555, 662 nm respectively, corresponding to ²H_11/2→⁴I_15/2, ⁴S_3/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 of Er³⁺ ions. The impact of different concentration of Er³⁺ and Yb³⁺ ions on the up-conversion luminescence intensity were discussed. When the doped concentration of Er³⁺ and Yb³⁺ ions are both 3%, the upconversion intensity got the most. The lgI-lgP curve shows that the green and red emissions are double-photon absorption process. And the upconversion mechanism and process of the samples were also analyzed.

Keywords: solvent-thermal method upconversion nanocrystal In₂O₃∶Er³⁺,Yb³⁺

摘要点击次数: 1866

全文下载次数: 2864

邹少瑜,孟建新.Er³⁺/Yb³⁺共掺纳米In₂O₃的制备及上转换发光[J].无机化学学报,2011,27(6):1138-1142.

查看全文查看/发表评论下载PDF阅读器

Support information: