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The origins of the green emission (GE) from ZnO nanostructures remain highly controversial despite extensive studies. Herein, transient absorption spectroscopy (TAS) revealed a small Stokes shift of ∼180 meV between the GE-centers (located at ∼0.7 eV above the valence band) and the GE peak — yielding the first experimental evidence of the GE originating from charge transitions of the ZnO di-vacancies...
A clear strategy to enhance the MPA cross-sections whilst independently tuning the emissive wavelengths of semiconductor QDs using seeded CdSe/CdS nanorod heterostructures is presented. MPA cross-sections as large as 2–3 orders and two-photon pumped ASE with threshold fluence 1–2 orders smaller compared to CdSe/CdS QDs were achieved using these heterostructures.
A clear strategy to enhance the MPA cross-sections whilst independently tuning the emissive wavelengths of semiconductor QDs using seeded CdSe/CdS nanorod heterostructures is presented. TPA cross-sections as large as 2–3 orders and two-photon pumped ASE with threshold fluence 1–2 orders smaller compared to CdSe/CdS QDs were achieved using these heterostructures.
Saturable absorption of graphene was experimentally and theoretically investigated in femtosecond time regime with the z-scan technique. The initial ultrafast carrier relaxation time was determined to be ∼8(±3) fs. Such ultrafast dynamics is far beyond the time resolution of other ultrafast techniques with typical hundred fs laser pulses. Our results strongly suggest that graphene is an excellent...
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