Near-Infrared to Visible Upconversion in Er3+ and Yb3+ Codoped Lu2O3   Nanocrystals: Enhanced Red Color Upconversion and Three-Photon Process   in Green Color Upconversion

doi:10.1021/jp810275t

CORC > 北京大学 > 化学与分子工程学院

	Near-Infrared to Visible Upconversion in Er3+ and Yb3+ Codoped Lu2O3 Nanocrystals: Enhanced Red Color Upconversion and Three-Photon Process in Green Color Upconversion
	Li, Yanping ; Zhang, Jiahua ; Zhang, Xia ; Luo, Yongshi ; Ren, Xinguang ; Zhao, Haifeng ; Wang, Xiaojun ; Sun, Lingdong ; Yan, Chunhua
刊名	journal of physical chemistry c
	2009
关键词	LUMINESCENT EFFICIENCY Y2O3-ER3+ YTTRIA IONS
DOI	10.1021/jp810275t
英文摘要	The synthesis and upconversion luminescence properties upon a 980 nm pump of cubic Lu1.88Yb0.1Er0.02O3 nanocrystals with various shapes, e.g., nanorods, nanosheets, and nanoparticles, are studied. It is observed that with decreasing size of the nanocrystals, the relative intensity of the upconverted red emission (Er3+ : F-4(9/2) -> I-4(15/2)) to the green one (Er3+: (H-2(11/2), S-4(3/2)) -> I-4(15/2)) is increased, and a three-photon process involved in the green upconversion, as described by F-4(9/2) (Er) + F-2(5/2) (Yb) -> H-2(9/2) (Er) + F-2(7/2) (Yb), is synchronously enhanced. An analysis based on steady-state rate equations indicates that the results can be induced by a large I-4(11/2) -> I-4(13/2) nonradiative relaxation rate with a small F-4(9/2) -> I-4(9/2) nonradiative relaxation rate. The large I-4(11/2) -> I-4(13/2) nonradiative relaxation rate is attributed to the occurrence of efficient cross energy transfer to OH- surface group due to the good energy match. As the size of the nanocrystals decreases, the relative surface area is increased, increasing the number of OH- group that can attach to the surface, therefore, enhancing the I-4(11/2) -> I-4(13/2) nonradiative relaxation rate through cross energy transfer to OH- surface group.; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; SCI(E); EI; 62; ARTICLE; 11; 4413-4418; 113
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/246422]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Li, Yanping,Zhang, Jiahua,Zhang, Xia,et al. Near-Infrared to Visible Upconversion in Er3+ and Yb3+ Codoped Lu2O3 Nanocrystals: Enhanced Red Color Upconversion and Three-Photon Process in Green Color Upconversion[J]. journal of physical chemistry c,2009.
APA	Li, Yanping.,Zhang, Jiahua.,Zhang, Xia.,Luo, Yongshi.,Ren, Xinguang.,...&Yan, Chunhua.(2009).Near-Infrared to Visible Upconversion in Er3+ and Yb3+ Codoped Lu2O3 Nanocrystals: Enhanced Red Color Upconversion and Three-Photon Process in Green Color Upconversion.journal of physical chemistry c.
MLA	Li, Yanping,et al."Near-Infrared to Visible Upconversion in Er3+ and Yb3+ Codoped Lu2O3 Nanocrystals: Enhanced Red Color Upconversion and Three-Photon Process in Green Color Upconversion".journal of physical chemistry c (2009).