Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb, Er nanocrystals

	Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb, Er nanocrystals
	Tang, J.; L. Chen; J. Li; Z. Wang; J. H. Zhang; L. G. Zhang; Y. S. Luo and X. J. Wang
	2015
发表期刊	Nanoscale
卷号	7 期号:35 页码:14752-14759
摘要	Red upconversion luminescence (UCL) is selectively enhanced by about 7 times via Fe3+ codoping into a NaYF4:Yb, Er nanocrystalline lattice. The maximum red-to-green ratio (R/G) as well as the overall integrated UCL intensity features at an Fe(3+)content of 20 mol%. The size and phase of nanocrystals are simultaneously manipulated via Fe(3+)doping with various concentrations by a facile hydrothermal method. Contrary to the literature, the pure hexagonal phase appears when Fe3+ concentrations are from 5 to 20 mol%, meanwhile, the size of NaYF4:Yb, Er nanocrystals reaches its maximum at 10 mol%. The intensified visible UCL especially the dominant red emission is mainly ascribed to the energy transfer (ET) from vertical bar F-2(7/2), T-4(1g) > (Yb3+-Fe3+ dimer) to F-4(9/2) (Er3+) states as well as the distortion of the crystalline field symmetry upon Fe(3+)codoping. Dynamic investigation of S-4(3/2) and F-4(9/2) states under the pulsed laser excitation of 980 nm along with the diffuse reflectance data further supports the proposed mechanism of UC processes. The results show the remarkable promise of Fe3+-codoped NaYF4:Yb, Er nanocrystals as upconverting nanoprobes with high sensitivity and penetrability in deeper tissue for multimodal biomedical imaging.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55419
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Tang, J.,L. Chen,J. Li,et al. Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb, Er nanocrystals[J]. Nanoscale,2015,7(35):14752-14759.
APA	Tang, J..,L. Chen.,J. Li.,Z. Wang.,J. H. Zhang.,...&Y. S. Luo and X. J. Wang.(2015).Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb, Er nanocrystals.Nanoscale,7(35),14752-14759.
MLA	Tang, J.,et al."Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb, Er nanocrystals".Nanoscale 7.35(2015):14752-14759.

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