Nanowires by Anqi Zhang Gengfeng Zheng & Charles M. Lieber

Author:Anqi Zhang, Gengfeng Zheng & Charles M. Lieber
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

In previous examples of NW lasers, the NWs functioned as both the gain medium and optical cavity. However, Qian et al. [34] showed that decoupling the gain medium and cavity can offer advantages over homogeneous NW structures for designed laser wavelength output in parallel with independent optimization of the cavity. For example, they designed multi-quantum-well (MQW) NW structures composed of a GaN NW core, which functions as the primary part of the optical cavity, and epitaxial InGaN/GaN MQW shells, which serve as the composition-tunable gain medium. Optical excitation of individual MQW NW structures yield lasing with emission engineered from 365 to 494 nm through modulation of quantum well composition (Fig. 6.12g).

Recently, organic-inorganic perovskite material was introduced as a new system for NW lasers. Zhu et al. [114] studied room-temperature and wavelength-tunable lasing from single-crystal lead halide perovskite NWs with very low lasing thresholds (220 nJ cm−2) and high quality factors (Q ~ 3600). The lasing threshold corresponds to a charge carrier density as low as 1.5 × 1016 cm−3. Kinetic analysis based on time-resolved fluorescence revealed little charge carrier trapping in these single-crystal NWs and yielded estimated lasing quantum yields approaching 100 %.

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