Journal of Materials Chemistry C
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2021
·Vol. 9
·期 14
·4888-4894
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IF 7.393
Xiaoping Guo,Shijie Zhen,Tianchang Ouyang,Shangxiong Zhou,Qiwen Pan,Dandan Yang,Jianhao Chen,Guoping Dong,Zujin Zhao,Jianrong Qiu,Ben Zhong Tang
With the wide use of micro–nano photonic devices in on-chip optical communication, physical and chemical sensing, organic microlasers have gained increasing attention owing to their special advantages including high integration, easy preparation and excellent optical properties. However, traditional microlasers suffer from the “aggregation-caused quenching” (ACQ) effect of gain molecules and high lasing thresholds. In this contribution, we meticulously designed organic microlaser assemblies based on an “aggregation-induced emission” (AIE) fluorophore for its unique characteristics. An innovative AIE fluorophore, namely triphenylamine-benzo[1,2-b:4,5-b′]-dithiophene 1,1,5,5-tetraoxide (TPA-BDTO), with highly efficient emission at the aggregated state is employed to hybridize with the PMMA matrix, obtaining microbottles with an ultra-smooth surface via the self-assembled strategy. Benefiting from the spatially well-separated intensity based on the prolate shape of the TPA-BDTO–PMMA microbottle, we realize a single-mode microlaser in a microbottle with an appropriate pump power via precise manipulation. Moreover, the TPA-BDTO–PMMA microlaser is demonstrated as an axial tensile strain sensor with high sensitivity (0.34 pm με−1), high resolution, real-time response and simple structure, which create new opportunities for organic microlasers and even lay a foundation for the research of lab-on-chips.
研究领域:
光学
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材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
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2019
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IF 1.888
Hanyu Yao,Honglie Shen,Quntao Tang
Efficient up/down conversion (UC/DC) thin films with high transmittance were prepared by an anisole dissolved polymethyl methacrylate (PMMA) solution mixed with β-NaYF 4 : 5% Er, 10% Yb (UCNPs) and β-NaYF 4 : 10% Tb, 1% Yb (DCNPs) nanocrystals , which required no postdeposition heat treatment. The full embedment of nanoparticles in the PMMA matrix was confirmed by atomic force microscopy , and the films were dense and uniform with high transmittance. Both UCNPs and as-prepared films exhibited strong UC emission bands in the green and red region. The relative intensities of green to red emissions in the films were enhanced compared with UCNPs because of the surface passivation by PMMA. Under excitation of 355 nm laser, both DCNPs and as-prepared films exhibited down conversion luminescence and no obvious intensity difference was observed between nanoparticles and the films. By tape test, the conversion films were proved with a strong adhesion due to the protection of PMMA. The results suggested that PMMA is a good matrix for fabrication of efficient UC/DC films with high transmittance and good adhesion.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
He Zhang,Lucheng Li,Jun Chen,Jing Wang,Yang Liu,Huijie Zhang,Qiang Wang,Shuangqing Wang,Guoqiang Yang
Phthalocyanine compounds are a class of macrocyclic conjugated structures with 18 π-electrons. And have better photophysical properties. However, the π-π electron interactions lead to aggregation between phthalocyanine molecules, which affects optical limiting properties. In this work, the conjugated organic small molecule antiphenylenediamine ( PDA ) is grafted onto the phthalocyanine conjugate system through the azo condensation reaction , and the covalent organic framework polymer ( PDA-InPc ) was obtained. Then it is doped into the polymethyl methylmethacrylate ( PMMA ) matrix to produce a phthalocyanine solid device with different thickness ( PMMA-PDA-InPc ). The aggregation-free phthalocyanine covalent organic frameworks avoids intramolecular aggregation of the phthalocyanine units, and dispersing it in PMMA solid devices can also reduce intermolecular π-π stacking. As a result, the fluorescence lifetime of PMMA-PDA-InPc is τ 1 = 0.52 ns (A 1 = 95.71%) and τ 2 = 11.5 ns (A 2 = 4.29%), indicating that the phthalocyanine conjugated unit exists mainly as monomers (95.71%), while the proportion as aggregates is very small (4.29%). At the input laser energy of 9 μJ, the nonlinear absorption coefficient of PMMA-PDA-InPc device is (2.2 × 10 −9 m/W), which is significantly better than PMMA-InPc device (1.0 × 10 −9 m/W), indicating that PMMA-PDA-InPc has improved nonlinear absorption and reverse saturation absorption. This design idea of non-aggregated phthalocyanine covalent organic frameworks and its solid device expands a new idea for the development of useable phthalocyanine optical limiters .
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhihai Wu,Yichen Zhang,Bintao Du,Guodong Tong,Chengkun Dong,Hao Zhang,Jun Wu,Jun Xia,Ziyang Hu,Zhenfu Zhao
Perovskite nanocrystals (PeNCs) have been regarded as one of the most promising candidate materials for next-generation display technology due to their remarkable optical performance. However, addressing the limitations of inherent instability and low luminescence efficiency of PeNC films is still a huge obstacle in its commercialization process. Herein, the low-cost and large-area perovskite nanocrystal composite films (NCFs) based on hexagonally distributed TiO 2 -based metasurface (inspired by the surface structure of butterfly wings) in combination with PeNCs encapsulated in PMMA matrix were fabricated. The photoluminescence intensity of perovskite NCFs can be enhanced by a maximum of 3.89 times based on the Purcell effect by tailoring to match the emission peaks of their PeNCs in various bands using the flexibility of metasurface design. The encapsulation of PMMA polymer and TiO 2 nanocavities also effectively enhanced the stability of PeNCs. Benefiting from these favorable characteristics, perovskite NCFs are applied to liquid crystal displays (LCDs) as color conversion layers, with color gamut reaching 122% of the NTSC standard and 180% of the commercial LCD screen, respectively, demonstrating that perovskite NCFs possess enormous potential in the high-end display fields. Furthermore, this metasurface fabrication process avoids complicated, time-consuming, and expensive process flow, laying the foundation for further commercialization beyond the laboratory.
研究领域:
材料科学
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光学
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显示技术
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纳米技术
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DOI
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 7
·2455-2463
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IF 13.3
Meirong Zhang,Bofeng Zhu,Xiao Zhang,Zhenxue Liu,Xiaoyong Wei,Zhicheng Zhang
Polymer-based dielectrics are chiefly used in high-pulse energy storage capacitors for their high breakdown strength, prominent processability, and low cost. Nevertheless, state-of-the-art commercial polymer-based dielectrics such as biaxially oriented polypropylene (BOPP), cannot satisfy the high energy density requirement in many fields because of their low permittivity. Limited success has been achieved in developing polar polymeric dielectrics with high energy density because of the quickly increased energy loss from polarization relaxation and charge conduction under a high electric field and temperature. To achieve high energy density and low loss in polar polymer dielectrics simultaneously, electron-deficient vinyl quinoline (VQQ) units are pre-copolymerized with methyl methacrylate (MMA) followed by blending with a PMMA matrix. The bulky and electron-deficient VQQs have successfully depressed the relaxation of PMMA and significantly decreased charge conduction under an elevated electric field. As a result, a rather high energy discharging efficiency (over 90%) could be finely maintained up to 800 MV m−1, and an energy density of 16.1 J cm−3 could be obtained, which are much better than those of reported polymer dielectrics. The strong space charge trapping effect of the low content of VQQ is well addressed by thermally stimulated depolarization currents (TSDC) and density functional theory analysis (DFT) of increasing breakdown strength, energy density and discharging efficiency. This work offers a promising strategy for achieving high energy density and low loss in polar polymer dielectrics for their commercial application in energy storage capacitors.
研究领域:
材料科学
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电气工程
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能量存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）