期刊
NANOSCALE
卷 6, 期 13, 页码 7461-7468出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr00857j
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资金
- Dream project [2V03410]
- Flagship project - Korea Institute of Science and Technology (KIST) [2E24572]
- Pioneer Research Center Program through the National Research Foundation of Korea
- Ministry of Science, ICT & Future Planning [NRF-2013M3C1A3065040]
- MRSEC Program of the National Science Foundation (NSF) [DMR-0819885]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- NSF through the MRSEC program
A pathway for achieving intense green light emitting LiGdF4:Yb,Er upconversion nanophosphors (UCNPs) via Y3+ doping is demonstrated. It was revealed that Y3+ doping initiated the formation of a tetragonal phase and affected the particle size. Single tetragonal-phase LiGd0.4Y0.4F4:Yb(18%),Er(2%) (LGY(0.4)F:Yb,Er) UCNPs exhibited strong upconversion (UC) green luminescence and tetragonal bipyramidal morphologies. They showed 1325 and 325-fold higher photoluminescence intensity than the 0 and 80 mol% Y3+-doped LiGdF4:Yb,Er UCNPs, respectively. Additionally the particle size (edge length) of LiGdF4:Yb,Er-based upconversion tetragonal bipyramids (UCTBs) was controlled from 60.5 nm to an ultrasmall size of 9.3 nm with varying Y3+ doping concentration. In an LGY(0.4)F:Yb,Er UCTB, uniform distribution of all constituent elements was directly confirmed by using high-angle annular dark-field scanning transmission electron microscopy and energy-filtered transmission electron microscopy (EFTEM) image analyses. In particular, existence of activator Er3+ ions with extremely small quantity was clearly seen over a particle on the EFTEM image. Moreover, the LGY(0.4)F:Yb,Er UCTBs were successfully incorporated into the polydimethylsiloxane (PDMS) polymer and the highly transparent UCTB-PDMS composites showed bright green light under the excitation of 980 nm infrared light.
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