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学者姓名：谭平恒
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Abstract ：
Two-dimensional (2D) materials with high anisotropic properties, such as black phosphorus and ReS2, show amazing potential for applications in future nano electronic and optoelectronic devices. However, degradation of black phosphorus under ambient conditions and the expensiveness of Re block their application. In this study, another layered material, KP15, that has highly anisotropic properties was successfully prepared. The detailed crystal structure and electron-density distribution calculation reveal that KP15 exhibits an anisotropic layered structure with two rows of P tubes connected by K atoms that are antiparallel in a single layer. Outstanding chemical stability, angular dependence of the Raman response, excitation, and exciton emission at room temperature have been found in exfoliated KP15 nanoribbons. Importantly, the exciton emission at room temperature suggests the existence of a large exciton binding energy. Our results indicate that, because this layered material, KP15, has high anisotropic properties and ultrachemical stability and is derived from abundant raw materials, it has great potential for applications in optoelectronic devices.
Keyword ：
anisotropic exciton emission anisotropic exciton emission anisotropic Raman response anisotropic Raman response KP15 KP15 layered-like structure layered-like structure anisotropic excitation anisotropic excitation anisotropy anisotropy
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| GB/T 7714 | Tian, Nan , Yang, Yanhan , Liu, Danmin et al. High Anisotropy in Tubular Layered Exfoliated KP15 [J]. | ACS NANO , 2018 , 12 (2) : 1712-, . |
| MLA | Tian, Nan et al. "High Anisotropy in Tubular Layered Exfoliated KP15" . | ACS NANO 12 . 2 (2018) : 1712-, . |
| APA | Tian, Nan , Yang, Yanhan , Liu, Danmin , Liu, Xuelu , Tan, Ping-Heng , Zhang, Dong et al. High Anisotropy in Tubular Layered Exfoliated KP15 . | ACS NANO , 2018 , 12 (2) , 1712-, . |
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Abstract ：
ZnO optical microcavities have shown great promise as a potential core component material/structure for ultraviolet lasers, light-emitting diodes and photonic sensors because of their outstanding optoelectronic properties. Here, we report a novel ultra-thin-walled ZnO (UTW-ZnO) microtube cavity with a wall thickness of similar to 750 nm, supporting multiple types of optical modes, including in-tube Fabry-Perot modes, in-wall Fabry-Perot modes and wave-guided whispering gallery modes (WG-WGMs). The free-exciton recombination rate and exciton-exciton collisions are promoted in the cavity. The intensities of near-band edge (ultravoilet (UV) light) and X-band (blue light) emission are therefore increased at least one order of magnitude in the temperature range of 0-500 degrees C. Meanwhile, the temperature-sensitive multicolor luminescence of the UTW-ZnO microtubes in the visible band from near-white to bluish-violet is demonstrated for the first time. Low-threshold UV lasing is also achieved in the UTW-ZnO microtube by WG-WGMs, where the excitation threshold is down to 5.50 mu W. Furthermore, light harvesting in the microtube cavity is beneficial to boosting the ZnO catalytic performance for photodegradation of organic dyes. The UTW-ZnO microtube exhibits compatibility to microfluidic channels for recyclable on-chip degradation. The present work provides new opportunities to design novel tubular wide-bandgap semiconductor devices for a variety of optoelectronic applications in micro/nanophotonics.
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| GB/T 7714 | Wang, Qiang , Yan, Yinzhou , Qin, Feifei et al. A novel ultra-thin-walled ZnO microtube cavity supporting multiple optical modes for bluish-violet photoluminescence, low-threshold ultraviolet lasing and microfluidic photodegradation [J]. | NPG ASIA MATERIALS , 2017 , 9 . |
| MLA | Wang, Qiang et al. "A novel ultra-thin-walled ZnO microtube cavity supporting multiple optical modes for bluish-violet photoluminescence, low-threshold ultraviolet lasing and microfluidic photodegradation" . | NPG ASIA MATERIALS 9 (2017) . |
| APA | Wang, Qiang , Yan, Yinzhou , Qin, Feifei , Xu, Chunxiang , Liu, Xuelu , Tan, Pingheng et al. A novel ultra-thin-walled ZnO microtube cavity supporting multiple optical modes for bluish-violet photoluminescence, low-threshold ultraviolet lasing and microfluidic photodegradation . | NPG ASIA MATERIALS , 2017 , 9 . |
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