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oe1(光电查) - 科学论文

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出版时间
  • 2019
  • 2018
  • 2017
  • 2016
研究主题
  • Optical pattern
  • Phase diagram
  • Surfactants
  • Optical properties
  • TB-MBJ
  • FP-LAPW
  • Electronic structure
  • GGA
  • DFT
  • Infrared Radiation
应用领域
  • Optoelectronic Information Science and Engineering
  • Chemistry
  • Materials Science and Engineering
机构单位
  • University of Texas at Arlington
  • Macquarie University
  • Universiti Malaysia Terengganu
  • Devi Ahilya University
  • National Institute of Information and Communications Technologies (NICT)
  • Povolzhskiy State University of Telecommunications and Informatics (PSUTI)
  • University of Sa?da Dr Tahar Moulay
  • University of Djillali Liabes
  • Assumption University
  • National Institute of Advanced Industrial Science and Technology
4497 条数据
?? 中文（中国） ▾

  • Saponification Precipitation Method of CsPbBr3 Nanocrystals with Blue-Green Tunable Emission

    摘要： We report on a new synthesis process for halide perovskite nanoplatelets and nanoplates that switches the production process of the cesium precursor from a fatty acid/cesium salt reaction to a cesium base/fatty acid ester reaction, thus enabling the reaction to occur in ambient conditions in minutes instead of hours. The saponification precipitation process reported here, as a result, does not require a vacuum oven or inert reaction environment in obtaining the cesium precursor, or any part of the reaction. Furthermore, the process creates a hygroscopic byproduct that results in a self-drying synthesis. The obtained perovskite nanocrystals exhibit a blue-green tunable emission that occurs via quantum confinement effect, phase, and morphology change. The consequence of these physical processes is that the band gap is highly tunable with temperature and the resulting nanocrystals show remarkable optical properties, while greatly simplifying the production of halide perovskite nanoplatelets and nanoplates.

    关键词： Blue-Green Tunable Emission,Saponification Precipitation Method,Hybrid Materials,Magnetic,CsPbBr3 Nanocrystals,Plasmonics,Optical

    更新于2025-11-19 16:46:39

  • 2D Photonic Crystal Nanodisk Array as Electron Transport Layer for Highly Efficient Perovskite Solar Cells

    摘要： Perovskite solar cells (PSCs) are currently exhibiting reproducible high efficiency; the manufacturing of low cost, scalable electron transport layers (ETLs) is becoming increasingly important. However, this remains a challenge for electron transport layers that exhibit excellent optical/electrical properties while being a thin film of simple morphology. Here we demonstrate the PSC of a 2D photonic crystal nanodisk (ND) array ETL that is compact, but greatly enhances light harvesting. The ND array is fabricated by nanosphere lithography using a monolayer of self-assembled polymer spheres as a physical mask. We fabricate ND arrays of various lattice constants simply by controlling the size of the polymer spheres. Optimal ND arrays exhibit strong forward scattering and optical confinement effects, greatly improving light harvesting in the perovskite layer. We also observe that the ND array improves charge transport by reducing contact resistance with the perovskite layer. ND array ETL PSCs reach 19% maximum power conversion efficiency, with low photocurrent-voltage hysteresis and stable photocurrent output.

    关键词： optical confinement,2D photonic crystals,nanodisk array,electron transport layer,perovskite solar cells,forward scattering

    更新于2025-11-19 16:46:39

  • Improvement of Optical and Thermal Properties for Quantum Dots WLEDs by Controlling Layer Location

    摘要： The inorganic halide perovskite quantum dots (QDs) have been considered as a promising substitute for white light-emitting diodes (WLEDs). In this article, the green CsPbBr3 QDs and red K2SiF6:Mn4+ (KSF) phosphor were used to fabricate the conversion layers. Because the layers location is fundamental to the absorption priority of blue light, the location of KSF and QDs were controlled and the QDs-up type and QDs-down type WLEDs were made. The optical power, luminous efficiency, CCE and luminous intensity in the middle of QDs-up type are 13.83 mW, 13.54 lm/W, 11.94% and 2.65 cd, meaning 24.26%, 25.72%, 2.63% and 23.83% higher than those of QDs-down type, respectively. In addition, the QDs-up type has a lower correlated color temperature (CCT) shift of 734 K and a decreased highest temperature of 56.8℃ (51.5% and 14.9% lower). These key property differences indicate that the QDs-up type is more suitable for the application in display and backlight. In order to explore the reasons for these differences, the emission spectra, CCE, reflection rate, absorption rate and temperature curves of QDs or KSF films were also analyzed, which provided a better understanding of designing package structures.

    关键词： layer location,thermal properties,quantum dots WLEDs,optical properties

    更新于2025-11-19 16:46:39

  • High dielectric polymer and its application on electro-optical Kerr effect of blue phase liquid crystal

    摘要： We present a high-dielectric polymer with a lateral ?uorine group, and its dielectric constant exhibits larger than 20 at 1 kHz. This well-soluble polymer can solely stabilize blue phase liquid crystals (BPLCs) while reducing the operating voltage by 30% and increasing the Kerr constant by nearly 70.6%. The in?uence of the polymer’s dielectric property on the operating voltage is investigated based on the potential distribution. The theoretical result predicts that the operation voltage can be further reduced by 50% when the dielectric constant of the chiral dopant is the same as the high-dielectric polymer. The potential application of high-dielectric materials for the improvement of BPLC devices is foreseeable.

    关键词： Kerr constant,blue phase liquid crystals,high-dielectric polymer,electro-optical Kerr effect,operating voltage

    更新于2025-11-14 17:28:48

  • High-performance flexible UV photodetectors based on AZO/ZnO/PVK/PEDOT:PSS heterostructures integrated on human hair

    摘要： Flexible optoelectronics is an emerging research field that has attracted profound interest in recent years due to the special functions and potential applications of these devices in flexible image sensors, optical computing, energy conversion devices, Internet of Things and other technologies. Here, we demonstrate the high-performance UV photodetectors using AZO/ZnO nanorods/PVK/PEDOT:PSS heterostructures integrated on human hair. Due to the precise interfacial energy-level alignment among all layers and superior mechanical characteristics of human hair, the as-obtained photodetector shows a fast response time, high photoresponsivity and excellent flexibility. According to integrate 7 heterostructures as 7 display pixels, the flexible UV-image sensor has superior device performance and outstanding flexibility and can produce vivid and accurate images of Arabic numerals from 0 to 9. Different combinations of the two heterostructures can also be used to achieve flexible photon-triggered logic functions including AND, OR and NAND gates. The findings in this work indicate the possibility of using the human hair as fibre-shaped flexible substrate and will allow the use of hair-based hierarchical heterostructures as building blocks to create exciting opportunities for next generation high-performance, multifunctional, low-cost, and flexible optoelectronic devices.

    关键词： photon-triggered logic gates,fast photoresponse,UV photodetectors,human hair,optical-image sensors

    更新于2025-11-14 17:04:02

  • Phosphotellurite glass and glass-ceramics with high TeO <sub/>2</sub> content: thermal, structural and optical properties

    摘要： Phosphotellurite based glasses have interesting features such as low characteristic temperatures, large glass forming ability, high thermal stability against crystallization and broad transparency window from ultraviolet (UV) to near-infrared (NIR), which makes them promising materials for photonic applications. In this work, phosphotellurite binary glasses, having composition (100 – x) TeO2–x Ba(PO3)2 with x varying from 1 to 20 mol %, were synthesized by the conventional melt-quenching method in covered gold crucibles under air. Optical, physical and structural properties of the new glass samples were investigated by differential scanning calorimetry, X-rays diffraction, Raman spectroscopy, transmission electron microscopy, linear optical absorption from UV to NIR, IR transmittance, and optical limiting experiments. Transparent glass-ceramics in the visible range were obtained for phosphotellurite samples containing 2, 4 and 6 mol % of Ba(PO3)2 and the phase crystallization was investigated through Rietveld analysis and transmission electron microscopy. The incorporation of Ba(PO3)2 into the TeO2 network drastically increases the thermal stability against devitrification and helps to shift the infrared multiphonon absorption edge to longer wavelengths. Nonlinear measurements performed with a picosecond laser at 532 nm indicate large effective nonlinear absorption coefficients for all samples. In summary, the dependence of the spectroscopic properties on the samples’ compositions revealed a promising transparent glass and glass-ceramics for photonic applications.

    关键词： transparent glass-ceramics,phosphotellurite glass,optical properties,nonlinear optical response

    更新于2025-11-14 17:03:37

  • Ellipsometric study on optical properties of hydrogen plasma-treated aluminum-doped ZnO thin film

    摘要： Aluminum-doped zinc oxide (AZO) thin films were prepared by radio frequency (RF) sputtering at room temperature, and then post-treated by hydrogen (H2) plasma at different durations. After H2 plasma treatment under the condition of 10 W, 200 °C and 3.0 Hours, the resistivity showed a dramatically decrease from 1.6 Ω cm to 3.4 × 10?3 Ω cm, while the transmittance at the wavelength of 550 nm was improved from 90.5% to 96.0%. The optical constants of H2 plasma-treated AZO thin films were detailed characterized by a varied angle spectroscopic ellipsometer. The results show that the refractive index n decreases in the entire measured wavelength range of 350–1100 nm, while the extinction coefficient k decreases in the short wavelength range and changes negligibly at the long wavelength range. These results can provide guidelines for the design and optimization of AZO thin film-based optoelectronic applications.

    关键词： Resistivity,Spectroscopic ellipsometer,Transmittance,Optical constants,Hydrogen plasma treatment,Aluminum-doped zinc oxide

    更新于2025-11-14 17:03:37

  • Direct Hot-Injection Synthesis of Lead Halide Perovskite Nanocubes in Acrylic Monomers for Ultrastable and Bright Nanocrystal–Polymer Composite Films

    摘要： In recent years, lead halide perovskite nanocrystals (NCs) have attracted significant attention in both fundamental research and commercial applications due to their excellent optical and optoelectrical properties. However, the protective ligands on the surface of the perovskites NCs could be easily removed after the tedious process of centrifugation, separation, and dispersion, which greatly hampers their stability against light, heat, moisture, and oxygen and limits their practical applications. Here we report a new post-processing-free strategy (i.e., without centrifugation, separation, and dispersion process) of using an UV-polymerizable acrylic monomer of lauryl methacrylate (LMA) as the solvent to synthesize CsPbBr3 NCs, and then adding polyester polyurethane acrylates oligomer, monomer (IBOA) and initiator for directly UV polymerization to fabricate NC-polymer composite films. These films exhibited an improved photoluminescence quantum yield (85-90%) than classic NC-film (40-50%), which were processed using octadecene (ODE) as the solvent for NC synthesis and post-processed for UV polymerization. Significantly, the as-fabricated films by post-processing-free strategy exhibited excellent photostability against strong Xe lamp illumination; while the other films using classic methods were quickly photo-degraded. Meanwhile, these NC-polymer composite films showed good stability against moisture and heating when aging in water at 50oC for over 200 hours. These films, along with K2SiF6:Mn4+ (KSF) phosphor emitters, were used as downconverters for blue LEDs in liquid crystal displays with a wide color gamut of 115% in the International Commission on Illumination (CIE) 1931 color space. This work provides a facile and effective strategy for the preparation of ultrastable and bright color-conversion NC films for the development of the next-generation wide color gamut displays.

    关键词： display backlight,lead halide perovskite,colloidal nanocrystals,color-conversion optical films,photostability

    更新于2025-11-14 17:03:37

  • Tunable optical and magnetic properties of Ni-doped CuSe nanowires using AAO template assisted hydraulic method

    摘要： High uniformity of un-doped and Ni-doped CuSe nanowires have been fabricated through smelting the bulk and injecting the melted liquid into the anodic aluminum oxide (AAO) template. The Ni dopant concentration and morphology of CuSe nanowires can be well controlled via preparing the bulk materials and the channel size of AAO template. The cathodoluminescence (CL) peaks of the un-doped, 0.5 at% and 1.0 at% Ni-doped CuSe nanowires showed a redshift of about 26 nm and 42 nm from un-doped CuSe nanowires (579 nm), respectively. Furthermore, above room temperature ferromagnetism was observed in 1.0 at% Ni-doped CuSe nanowires at 300 K. The facile injection molding method fabricated nanowires with tunable optical and magnetic properties could be applied to prepare varied nanomaterials for spintronic devices in the further.

    关键词： optical,anodic aluminum oxide (AAO),CuSe,doped,nanowires,magnetic

    更新于2025-11-14 17:03:37

  • Highly Selective Optical Detection of Fe <sup>3+</sup> Ions in Aqueous Solution Using Label-Free Silicon Nanocrystals

    摘要： Highly brightness amine-terminated silicon nanocrystals (Si NCs) have been utilized in a simple and rapid assay for the highly selective and sensitive detection of Fe3+ via quenching of their strong blue luminescence, without the need for analyte-specific labeling groups. Sensitive detection of Fe3+ is successfully demonstrated, with a linear relationship observed between luminescence quenching and Fe3+ concentration from 5 × 10?6 to 900 × 10?6 m and a limit of detection of 1.3 × 10?6 m. The Si NCs show excellent selectivity toward Fe3+ ions, with no quenching of the luminescence signal induced by the presence of Fe2+ ions, allowing for solution phase discrimination between the ionic species in different charge states.

    关键词： nanocrystal,sensor,iron,optical detection

    更新于2025-11-14 15:32:45