Journal
NANO LETTERS
Volume 20, Issue 6, Pages 4204-4210Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00601
Keywords
shear-driven method; monodispersed nanorods; alignment; polarized upconversion luminescence; nematic phase
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Funding
- National Natural Science Foundation of China [61805113]
- Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07C071]
- Natural Science Foundation of Guangdong Province [2017A030313034, 2018A030310224]
- Shenzhen Science and Technology Innovation Commission [JCYJ20170817111349280, JCYJ20180305180635082, GJHZ20180928155207206]
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Lanthanide-doped particles exhibit unique polarization-dependent luminescence due to the anisotropic crystalline local symmetry surrounding the emitter. Precise control of the orientation of particles shows great significance for exploiting the luminescent polarization and their potential applications. Here, we demonstrated a facile polypropylene-aided shear-driven method to obtain large-scale orientationally ordered upconversion nanorods, showing a liquid-crystalline nematic phase. Upconversion nanorods with low aspect ratios were well-aligned with the crystalline c-axis along the shearing direction using monodispersed colloid nanorods as the nanoink. The order parameter of aligned upconversion nanorods can reach up to 0.95. The nematic upconversion nanorods demonstrated strong polarization-dependent luminescence with the high degrees of polarization of the F-4(9/2) sublevels at 657 and 661 nm being 0.47 and 0.59, respectively. Taking advantage of these mesoscopic well-aligned upconversion nanorods, their peculiar polarized emissions are potentially useful for some interdisciplinary applications such as polarization-sensitive bioprobes and anticounterfeiting.
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