Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence

doi:10.1088/1674-1056/21/7/073201

中国物理B ›› 2012, Vol. 21 ›› Issue (7): 73201-073201.doi: 10.1088/1674-1056/21/7/073201

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence

何恩节, 刘宁, 章毛连, 秦炎福, 官邦贵, 李勇, 郭明磊

Department of Physical and Electronics, Anhui Science and Technology University, Bengbu 233100, China

收稿日期:2011-08-09 修回日期:2011-12-29 出版日期:2012-06-01 发布日期:2012-06-01
基金资助:
Project supported by the Outstanding Youth Talent Fund for University in Anhui Province, China (Grant No. 2011SQRL116), the Natural Science Foundation of Universtiy in Anhui Province, China (Grant No. KJ2011Z082), the Youth Science Foundation of Anhui Science and Technology University, China (Grant No. ZRC2011268), and the Materials Key Construction Subject Foundation of Anhui Science and Technology University, China (Grant No. AKXK20102-2).

Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence

He En-Jie(何恩节) Liu Ning(刘宁)^†, Zhang Mao-Lian(章毛连), Qin Yan-Fu(秦炎福), Guan Bang-Gui(官邦贵), Li Yong(李勇), and Guo Ming-Lei(郭明磊)

Department of Physical and Electronics, Anhui Science and Technology University, Bengbu 233100, China

Received:2011-08-09 Revised:2011-12-29 Online:2012-06-01 Published:2012-06-01
Contact: Liu Ning E-mail:liuning.szsz@163.com; optical enjiehe@126.com
Supported by:
Project supported by the Outstanding Youth Talent Fund for University in Anhui Province, China (Grant No. 2011SQRL116), the Natural Science Foundation of Universtiy in Anhui Province, China (Grant No. KJ2011Z082), the Youth Science Foundation of Anhui Science and Technology University, China (Grant No. ZRC2011268), and the Materials Key Construction Subject Foundation of Anhui Science and Technology University, China (Grant No. AKXK20102-2).

摘要/Abstract

摘要： By employing a certain proportion of hydrogen peroxide, ammonia, ammonium fluoride and ethylene diamine tetraacetic acid (EDTA) as precipitator, well-crystallized LaOF:Eu³⁺ and LaOF:Yb³⁺, Er³⁺ nanocrystals are synthesized with chemical co-precipitation method. The structural properties of these samples are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR) spectra. The results show that all the samples have an average size below 70 nm and decreases gradually with the increase of the EDTA content, and a certain number of EDTA molecules are coupled with doped ions on the surfaces of nanocrystals. Most of the doped ions are proved to be enriched on the surfaces of nanocrystals and surrounded by the high energy vibration groups and bonds in EDTA molecules. The observed differences in upconversion emission spectrum among the different LaOF:Yb³⁺, Er³⁺ nanocrystals are explained by the different two-photon upconversion mechanisms. Especially, in the LaOF:Yb³⁺, Er³⁺ nanocrystals with EDTA, the two-photon processes that contain several special cross relaxation processes are introduced to analyse the corresponding upconversion mechanisms.

关键词: surface effect, nanocrystals, cross relaxation

Abstract: By employing a certain proportion of hydrogen peroxide, ammonia, ammonium fluoride and ethylene diamine tetraacetic acid (EDTA) as precipitator, well-crystallized LaOF:Eu³⁺ and LaOF:Yb³⁺, Er³⁺ nanocrystals are synthesized with chemical co-precipitation method. The structural properties of these samples are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR) spectra. The results show that all the samples have an average size below 70 nm and decreases gradually with the increase of the EDTA content, and a certain number of EDTA molecules are coupled with doped ions on the surfaces of nanocrystals. Most of the doped ions are proved to be enriched on the surfaces of nanocrystals and surrounded by the high energy vibration groups and bonds in EDTA molecules. The observed differences in upconversion emission spectrum among the different LaOF:Yb³⁺, Er³⁺ nanocrystals are explained by the different two-photon upconversion mechanisms. Especially, in the LaOF:Yb³⁺, Er³⁺ nanocrystals with EDTA, the two-photon processes that contain several special cross relaxation processes are introduced to analyse the corresponding upconversion mechanisms.

Key words: surface effect, nanocrystals, cross relaxation

中图分类号: (Visible and ultraviolet spectra)

32.30.Jc

32.50.+d (Fluorescence, phosphorescence (including quenching))

何恩节, 刘宁, 章毛连, 秦炎福, 官邦贵, 李勇, 郭明磊 . Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence[J]. 中国物理B, 2012, 21(7): 73201-073201.

He En-Jie(何恩节) Liu Ning(刘宁), Zhang Mao-Lian(章毛连), Qin Yan-Fu(秦炎福), Guan Bang-Gui(官邦贵), Li Yong(李勇), and Guo Ming-Lei(郭明磊) . Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence[J]. Chin. Phys. B, 2012, 21(7): 73201-073201.

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Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence

Surface effect of nanocrystals doped with rare earth ions enriched on surface and its application in upconversion luminescence

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