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Showing 1–9 of 9 results
Advanced filters: Author: Clément Livache Clear advanced filters

  • Researchers demonstrate quantum dot lasing using excitation by an electrically modulated (0.1–1% duty cycle), low-power continuous-wave laser diode, achieving lasing at a pump intensity just above 500 W cm−2 at 77 K and 3.6 kW cm−2 at room temperature.

    • Donghyo Hahm
    • Changjo Kim
    • Victor I. Klimov
    ResearchOpen Access
    Nature Photonics
    Volume: 20, P: 208-215

  • Liquid lasers based on solutions of colloidal quantum dots exhibit a trion-like optical gain state with suppressed Auger recombination, which combined with a Littrow optical cavity enables stable and tunable liquid-state lasing.

    • Donghyo Hahm
    • Valerio Pinchetti
    • Victor I. Klimov
    ResearchOpen Access
    Nature Materials
    Volume: 24, P: 48-55

  • The addition of magnetic dopants to semiconductor quantum dots can enhance the quantum efficiency of photon-to-exciton conversion through spin-exchange carrier multiplication. Here, the authors show that this effect can be utilized to boost photocurrent in films of Mn-doped CdSe/HgSe quantum dots with an inverted band structure.

    • Jungchul Noh
    • Clément Livache
    • Victor I. Klimov
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-12

  • Colloidal quantum dot devices demonstrating electrically pumped amplified spontaneous emission are described, showing strong, broadband optical gain and bright edge emission, opening the path to solution-processable laser diodes.

    • Namyoung Ahn
    • Clément Livache
    • Victor I. Klimov
    ResearchOpen Access
    Nature
    Volume: 617, P: 79-85

  • Carrier multiplication generates multiple excitons for each absorbed photon but is normally limited by fast phonon-assisted relaxation. Here the authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots, due to very fast spin-exchange interactions between Mn ions and the quantum dots that outpace energy losses arising from phonon emission.

    • Ho Jin
    • Clément Livache
    • Victor I. Klimov
    ResearchOpen Access
    Nature Materials
    Volume: 22, P: 1013-1021

  • Nonradiative Auger recombination and poor stability of colloidal-quantum-dot solids at high current densities are primary obstacles to the realization of laser diodes based on these materials. Jung et al. achieve the current densities in excess of 1,000 A cm−2, which allows them to boost brightness to ~10 million cd m−2 and to produce strong, two-band optical gain.

    • Heeyoung Jung
    • Young-Shin Park
    • Victor I. Klimov
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • The field of wavefunction engineering using intraband transition to design infrared devices has been limited to epitaxially grown semiconductors. Here the authors demonstrate that a device with similar energy landscape can be obtained from a mixture of colloidal quantum dots made of HgTe and HgSe.

    • Clément Livache
    • Bertille Martinez
    • Emmanuel Lhuillier
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-10