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| 1 | 日光激发无机UVC上转换发光材料的研究显示文摘可见光光源,特别是低激发密度的可见光光源,如半导体LED、荧光灯及太阳光,激发的紫外光C段(UVC)上转换材料在无感标识与防伪、光催化、生物和城市环境领域的抗菌等方面具有巨大的应用潜力。可见光激发UVC上转换材料要求:发光中心第一激发态具有较长的能级寿命,且能有效吸收可见光光子;基质材料能有效透过可见光和UVC。由于外层电子的屏蔽作用,稀土离子具有丰富的、寿命较长的能级;高带隙无机材料可以有效透过UVC,因此稀土离子掺杂的无机发光材料是可见光激发UVC上转换荧光体的理想选择。然而可见光激发UVC上转换荧光体较低的发射效率限制了应用,如何提高低激发密度下的UVC上转换功率是当前面临的最大难题。着重介绍可见光激发的UVC上转换材料发展过程,当前的可见光激发UVC上转换的研究现状,低激发密度研究领域面临的挑战、解决途径和方法。 | 尹知谦 吕品书 朱铮 杨艳民 | 2021 | 激光与光电子学进展2021，58，15： | 2 |
| 2 | Superior single-mode lasing in a self-assembly CsPbX3 microcavity over an ultrawide pumping wavelength range显示文摘All-inorganic perovskite micro/nanolasers are emerging as a class of miniaturized coherent photonic sources for many potential applications,such as optical communication,computing,and imaging,owing to their ultracompact sizes,highly localized coherent output,and broadband wavelength tunability.However,to achieve singlemode laser emission in the microscale perovskite cavity is still challenging.Herein,we report unprecedented single-mode laser operations at room temperature in self-assembly Cs Pb X3 microcavities over an ultrawide pumping wavelength range of 400–2300 nm,covering one-to five-photon absorption processes.The superior frequency down-and upconversion single-mode lasing manifests high multiphoton absorption efficiency and excellent optical gain from the electron–hole plasma state in the perovskite microcavities.Through direct compositional modulation,the wavelength of a single-mode Cs Pb X3 microlaser can be continuously tuned from blue-violet to green(427–543 nm).The laser emission remains stable and robust after long-term high-intensity excitation for over 12 h(up to 4.3×107 excitation cycles)in the ambient atmosphere.Moreover,the pump-wavelength dependence of the threshold,as well as the detailed lasing dynamics such as the gain-switching and electron–hole plasma mechanisms,are systematically investigated to shed insight into the more fundamental issues of the lasing processes in Cs Pb X3 perovskite microcavities. | GUOEN WENG JIYU YAN SHENGJIE CHEN CHUNHU ZHAO HANBING ZHANG JIAO TIAN YUEJUN LIU XIAOBO HU JIAHUA TAO SHAOQIANG CHEN ZIQIANG ZHU HIDEFUMI AKIYAMA JUNHAO CHU | 2021 | Photonics Research2021，9，1： | 1 |
| 3 | Microcrystal modulated exciton-polariton emissions from single ZnO@ZnO:Ga microwire显示文摘Due to their outstanding surface-to-volume ratio,highly smooth surface,and well-defined crystal boundary,semiconducting micro-/nanocrystals have been used as a pivotal platform to fabricate multifunctional optoelectronic devices,such as superresolution imaging devices,solar concentrators,photodetectors,light-emitting diodes(LEDs),and lasers.In particular,micro-/nanocrystals as key elements can be employed to tailor the fundamental optical and electronic transport properties of integrated hetero-/homostructures.Herein,ZnO micro crystal-decorated pre-synthesized Ga-doped ZnO microwire(ZnO@ZnO:Ga MW)was prepared.The single ZnO@ZnO:Ga MW can be used to construct optically pumped Fabry-Perot(F-P)mode microlasers,with the dominating lasing peaks centered in the violet spectral region.Stabilized exciton-po lari ton emissions from single ZnO@ZnO:Ga MW-based heterojunction diode can also be realized.The deposited ZnO microcrystals can facilitate the strong coupling of F-P optical modes with excitons,leading to the formation of exciton-polariton features in the ZnO@ZnO:Ga MW.Therefore,the waveguiding lighting behavior and energy-band alignment of ZnO microcrystal-sheathed ZnO:Ga MW radial structures should be extremely attractive for potential applications in semiconducting microstructure-based optoelectronic devices,such as micro-LEDs,laser microcavities,waveguides,and photodetectors. | WANGQI MAO MINGMING JIANG JIAOLONG JI PENG WAN XIANGBO ZHOU CAIXIA KAN | 2020 | Photonics Research2020，8，2： | 1 |
| 4 | Low-threshold and narrow-emission random lasing in a self-assembly TiN nanoparticle-doped carbon quantum dot/DCM nanowire composite显示文摘The random lasing in quantum dot systems is in anticipation for widespread applications in biomedical therapy and image recognition,especially in random laser devices with high brightness and high monochromaticity.Herein,low-threshold,narrowband emission,and stable random lasing is realized in carbon quantum dot(CQD)/DCM nanowire composite-doped TiN nanoparticles,which are fabricated by the mixture of carbon quantum dots and self-assembly DCM dye molecules.The F?rster resonance energy transfer process results in a high luminescence efficiency for the composite of carbon dots and DCM nanowires,allowing significant random lasing actions to emerge in CQD/DCM composite as TiN particles are doped that greatly enhance the emission efficiency through the plasmon resonance and random scattering.Thus,sharp and low-threshold random lasing is finally realized and even strong single-mode lasing occurs under higher pumping energy in the TiN-doped CQD/DCM composite.This work provides a promising way in high monochromaticity random laser applications. | JING LYU XINYU ZHANG LEI CAI LI TAO WEIFENG MA AN LI YE TIAN YUNSONG YIN DENAN KONG WEN YI XIANSHUANG WANG RUIBIN LIU | 2022 | Photonics Research2022，10，9： | 0 |
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