期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 14, 页码 5389-5396出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja110996c
关键词
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资金
- ONR
- ARO
- NSF
- NIH
- DOE
- Sloan Research Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001016]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0827681] Funding Source: National Science Foundation
We report a simple, fast and green phosphine-free colloidal chemistry to synthesize high-quality wurtzite-type Mn-doped ZnS quantum rods (QRs) with tunable diameters (1.6-5.6 nm), high aspect ratios (up to 50), variable Mn doping levels (0.18-1.60%), and high quantum yields (up to 45%). The electron paramagnetic resonance spectra with modeling reveal the successful doping of paramagnetic Mn2+ ions in the host ZnS QRs. The Mn-doped ZnS QRs demonstrate tunable dual-color (orange and blue) emissions by tuning the doping levels and UV excitation wavelengths. The orange emission with long decay lifetime (3.3 ms) originates from the doped Mn2+ states, while the blue emission with fast decay lifetime (0.31 ns) is attributed to the QR surface states. The bright two- and three-photon excitation upconversion luminescence from the Mn-doped ZnS QRs have been observed using tunable near-infrared femtosecond laser. Our strategy provides a versatile route to programmably control the optical properties of anisotropic semiconductor nanomaterials, which may create new opportunities for photonic devices and bioimaging applications.
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