ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiaxin Wang,Yuanzhou Zhang,Jun Chen,Yi Wei,Dejian Yu,Lumeng Liang,Yang Liu,Ye Wu,Weili Shen,Xiaoming Li,Haibo Zeng
In this work, we proposed a fluorescence conversion layer with polarization characteristics to enhance UV polarization detection for the first time. To achieve this goal, the colloidal lead halide CsPbBr3 nanowires (NWs) with appropriate lengths were synthesized by the method of ultrasonication synthesis assisted by the addition of hydrobromic acid (HBr) ligands. By adding HBr, the properties of synthesized NWs are improved, and due to the controllable perovskite-stretched NWs, polymer composite films were fabricated, which can generate photoluminescence (PL) with strong polarization. The optimized stretched composite film can achieve a polarization degree of 0.42 and dichroism ratio (I∥/I⊥) of 2.49 at 520 nm. Based on this film, an imaging system with polarization-selective properties and efficient UV spectral conversion was developed. The spectrum conversion of 266 to 520 nm luminescence wavelength was realized and sensitive to the polarization of incoming 266 nm UV light. The experimental results also showed that the response after spectral conversion is greatly improved, and different responsivities can correspond to different polarization states. This imaging system overcomes the insufficiency of the conventional charge coupled device (CCD), which makes it difficult to receive the optical signal for high-quality UV imaging. The use of light conversion films with polarization characteristics for polarized UV imaging is of great significance for improving the detection of solar-blind UV bands and the recognition of military targets.
研究领域:
材料科学
·
光学工程
·
光电技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 40
·18790-18796
·
IF 6.97
Zizhen Zhang,Yixuan Liu,Chong Geng,Shuangshuang Shi,Xinsu Zhang,Wengang Bi,Shu Xu
Microfluidics has been considered as an effective platform in the mechanism study and large-scale manufacturing of nanomaterials. In this work, we report the facile synthesis of quantum-confined CsPbBr3 nanowires (NWs) by using a continuous-flow microfluidic reactor. The optimized reaction temperature is around 50 °C, and one “synthesis run” by microfluidics requires only ten minutes. This study reveals that the formation of CsPbBr3 NWs takes place by a hybrid growth mechanism of seed-mediated growth and oriented attachment growth. This microfluidic approach benefits the alignment of the short quantum-confined NWs and promotes their oriented attachment to form long NWs, while conventional flask synthesis results in large and irregular nanorods under the same reaction conditions. This work not only provides a new synthetic path for the preparation of CsPbX3 NWs but also sheds some light on the fundamental study of CsPbX3 NWs.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yichi Zhong,Jian Huang,Hongyu Yang,Zhanpeng Wang,Kun Qian,Jingzhou Li,Hongxing Dong,Long Zhang
All-inorganic cesium lead bromide zero-dimensional perovskite Cs4PbBr6 is highly valued for its excellent photoelectric conversion efficiency and exceptional stability. However, its application value in the visible light optical field is limited due to large bandgap and strong ionic and covalent bonds in the crystal structure, which inhibit photon emission in the visible light spectrum. Nonetheless the easily convertible properties among perovskite derivatives bring new opportunities. This study is the first to report the transformation of Cs4PbBr6 nanocrystals into CsPbBr3 nanocrystals, which then grow into nanowires and eventually form micrometer-scale optical microcavities. This innovative approach provides a novel strategy for the fabrication of perovskite micro-nano lasers and strengthens the connections among various perovskite derivatives. The nanowires exhibit excellent quantum size effects and are microdevices with polarized photoluminescence emission capability. Meanwhile, the large-sized microrods exhibit perfect lasing performance with low threshold ~34 μJ cm-2 and high Q-factor ~1229. These high-quality performances make Cs4PbBr6 nanocrystals have significant potential in diverse fields such as optical communication, biomedical applications, photonics and optoelectronics.
研究领域:
材料科学
·
光学工程
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Linghui Zhang,Qisheng Sun,Youkui Xu,Lili Han,Qian Wang,Yangchun Yu,Zhiwen Jin,Shikuan Yang,Zhipeng Ci
Fabrication of ultrathin ( e.g. , ∼2 nm) CsPbBr 3 nanowires is still challenging for existing methods, for the extremely fast crystal growth process of CsPbBr 3 . Here, we developed a self-assembled nanotemplate-confined growth concept to prepare ultrathin CsPbBr 3 nanowires. During electrospinning using the N , N -dimethylformamide (DMF) solution composed of polymethyl methacrylate (PMMA), PbBr 2 , CsBr, and capping agents, PMMA chains would assemble into nanochannels acting as nanotemplates within the electrospun PMMA fibers. Owing to the very limited amount of precursors within the nanochannels, ultrathin CsPbBr 3 nanowires were prepared after DMF evaporation. The CsPbBr 3 nanowires within the PMMA fibers or dispersed in toluene showed bright blue luminescence. The structure of the CsPbBr 3 products could be adjusted by the stirring time, as well as the amount of PMMA, PbBr 2 , and CsBr in DMF. Overall, we developed a new method towards engineering ultrafine CsPbBr 3 nanostructure through self-assembled template-confined growth concept during electrospinning, which may find potential applications in blue light emitting diodes and other optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）