Developing Lasers from All-inorganic Perovskite Nanocrystals
  • 来源:深圳大学物理与能源学院
  • 发布者:学院办公室
  • 发布时间:2018-09-27 16:39:40
  • 浏览次数:74
  • 报告主题:Developing Lasers from All-inorganic Perovskite Nanocrystals

    主讲嘉宾:孙汉东,新加坡南洋理工大学教授

    时    间:2018年10月7日上午10:00-11:30

    地    点:深圳大学南区物理与能源学院1206会议室

     

    报告摘要:

         Colloidal all-inorganic cesium lead halide perovskite nanostructures (CsPbX3, X = Cl, Br, I) have been emerging as a new class of quantum materials for lasing. This material system shows combined merits of both colloidal quantum dots and halide perovskites. Low-threshold and ultrastable stimulated emission under atmospheric conditions will be presented. The gain mechanism is attributed to biexcitonic recombination. The nonlinear optical properties including the multi-photon absorption and resultant photoluminescence of the CsPbX3 nanocrystals were investigated. A large two-photon absorption cross-section of up to ~1.2×105 GM is determined from 9 nm-sized CsPbBr3 nanocrystals. Low-threshold frequency-upconverted stimulated emission by multi-photon absorption was also observed from the thin films of close-packed CsPbBr3 nanocrystals. Moreover, I will report the breakthrough in realizing the challenging while practically desirable vertical cavity surface emitting lasers (VCSELs) based on the CsPbX3 inorganic perovskite nanocrystals. These laser devices feature record low threshold (9 µJ/cm2), unidirectional output (beam divergence of ~3.6º) and superb stability. Both single-mode and multimode lasing operation are achievable in the device.

    报告人简介:

        孙汉东教授现为美国物理学会会士(APS Fellow)、新加坡南洋理工大学物理与应用物理系副系主任。他本科毕业于大连理工大学,硕士毕业于华中科技大学,博士毕业于香港科技大学。曾经在日本理化研究所光子学研究中心和英国斯特拉思克莱德大学长期从事科研工作。目前主要从事光物理和材料科学的交叉学科研究。他的研究兴趣包含激光光谱学、光电子材料和器件以及光子学应用等。孙教授在Nature Comm.Phys. Rev. Lett.PANSAdv. Mater. Nano Lett.等权威期刊上发表学术论文200多篇,被SCI期刊引用6000多次,H-index >46

     

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