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Emission of dispersed-type inorganic EL devices with frequency-variable high-voltage oscillation circuit
摘要： Dispersed‐type inorganic electroluminescent (EL) devices composed of a transparent electrode, a phosphor, a dielectric, and a back electrode were prepared under various conditions using a zinc sulfide (ZnS)‐based phosphor. Additionally, a voltage/frequency variable circuit was designed. A compact high‐voltage/frequency variable circuit including three modules for boosting, frequency conversion, and voltage conversion was designed. A 140 Vpp voltage and a frequency in the range of 270 Hz to 2.4 kHz can be controlled by this circuit. The emission has begun to be observed at a voltage about 60 Vpp and a frequency of 400 Hz, at a voltage about 40 Vpp and a frequency of 1.4 kHz, 2.4 kHz, respectively. The emission intensity increased with an increase in frequency; emission with a wavelength of 450 nm was strongly influenced by the frequency. The luminescence and the electrical properties were affected by the preparation conditions including device structures, dispersion of ZnS:Cu, and Cl particles because of the current path generated by defects in the EL cell.
关键词： inorganic,organic dye,electroluminescence,ZnS:Cu,Cl,oscillation circuit,driver circuit
更新于2025-09-23 15:22:29
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Photovoltaic Performance of Porphyrina??Based Dyea??Sensitized Solar Cells with Binary Ionic Liquid Electrolytes
摘要： Here, we studied a green porphyrin sensitizer Y350 based dye-sensitized solar cells with binary ionic liquid based electrolytes, which are a mixture of 1-methyl-3-propyl-imidazolium iodide with 1-methyl-1-butylpyrrolidinium bis(trifluromethylsulfonyl)-imide, 1-butylpyridinium bis(trifluromethylsulfonyl)imide, 1-methyl-3-ethylimidazolium bis(trifluromethylsulfonyl)imide or 1-methyl-3-ethylimidazolium tetracyanoborate.The best semi-transparent green DSC device exhibited a short-circuit current density of 9.1 mA cm-2, an open-circuit voltage of 727 mV and a fill factor of 70%, corresponding to an overall power conversion efficiency (PCE) of 4.9 % under standard AM 1.5G illuminations at 100 mW cm-2. The PCE increased to 6.1 % with opaque films containing larger light scattering TiO2 particles.
关键词： Dye-sensitized solar cell,Photovoltaics,Porphyrin dye,Organic dye,Ionic liquid electrolyte
更新于2025-09-23 15:19:57
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Dye-doped electrospun fibers for use as random laser generator: The influence of spot size and scatter concentration
摘要： The development of electrospun polymer fiber networks embedded with metal oxide nanoparticles in organic dye media favors the photons waveguiding and multiple scattering, providing the adequate environment for random laser action. The use of water-soluble polymer solution as support for electrospun matrix introduces relevant application in biomedical applications. Herein, it is explored the use of block copolymers (Eudragit L100) as support for electrospinning of polymer fiber doped with titanium dioxide (scatter centers) and rhodamine B (gain media). The resulting fiber net presented random laser behavior that depends on aggregation degree of gain media (rhodamine B) due to the combination of reabsorption/reemission processes with tunable response (emission peak position). These results open new possibilities for use of low-cost and water soluble electrospun-based random lasers based on organic dyes and random network of polymer matrix.
关键词： Fibers,Electrospinning,Organic dye,Random laser
更新于2025-09-23 15:19:57
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D-A-π-A based organic dyes for efficient DSSCs: A theoretical study on the role of π-spacer
摘要： A series of novel D-A-π-A organic dyes with different π-spacers for dye-sensitized solar cells (DSSCs) are designed based on hetero-tri-arylamine donor-based dye DP2. The key parameters of all the dyes affecting short-circuit current (JSC) and open-circuit voltage (VOC) are theoretically investigated in detail using density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to reveal structure-property relationships. The theoretical results indicate that extending π-spacer is beneficial to improve light-absorbing capacities with larger responsive range of spectra and molar extinction coefficients (ε). The designed dyes DP2-1–DP2-5 exhibit a good balance in various important properties including light harvesting efficiency (LHE), electronic injection driving force (ΔGinject) and vertical dipole moment (μnormal) compared to reference dye DP2. Among all the designed dyes, DP2-3–DP2-5 containing π-spacers with branched chain exhibit obvious red shifted absorption band, smaller regeneration driving force (ΔGreg) and reorganization energy (λtotal), and larger excited state lifetime (τ) and number of photoinjected electrons (nc). This study is expected to provide new clues for the experimental synthesis of highly efficient metal-free organic dyes for DSSCs.
关键词： Electronic structure,Organic dye,Dye-sensitized solar cells,Density functional theory
更新于2025-09-19 17:15:36
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A new ratiometric fluorescence assay based on resonance energy transfer between biomass quantum dots and organic dye for the detection of sulfur dioxide derivatives
摘要： Sulfur dioxide (SO2) is considered as the fourth gas signal molecule after nitric oxide (NO), carbon monoxide (CO) and hydrogen sulfide (H2S). It plays important roles in several physiological processes. Therefore, the design and synthesis of nanoprobes for the detection of SO2 derivatives in cells is of great significance. Herein, we report a new ratiometric fluorescence nanoprobe based on resonance energy transfer (RET) between biomass quantum dots (BQDs) and organic dye (DMI) for the detection of SO2 derivatives. The proposed ratiometric fluorescence assay allows the determination of HSO3? in the range of 1.0 to 225 μM with a detection limit of 0.5 μM. Importantly, the proposed ratiometric fluorescence nanoprobe exhibits a high photostability and good selectivity for HSO3? over other chemical species including H2S and biological mercaptans. Quantitation of HSO3? in cell lysates by using the nanoprobe is demonstrated.
关键词： ratiometric fluorescence,resonance energy transfer,organic dye,Sulfur dioxide,biomass quantum dots,nanoprobe
更新于2025-09-16 10:30:52
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Effect of Carboxyl-Functionalized Single Walled Carbon Nanotubes on the Interfacial Barrier Height of Malachite Green Dye Based Organic Device
摘要： In this study, we have estimated the interfacial barrier height ((cid:1)b) of Indium Tin Oxide (ITO) coated glass/Malachite Green (MG) dye/Aluminium (Al) based organic device and subsequently we have also observed the effect of carboxylfunctionalized SWCNT (COOH-SWCNT) on the (cid:1)b. Presence of COOH-SWCNT reduces the interfacial barrier height as SWCNT acts as filler and provides easy path for charge percolation. We have used ITO coated glass and aluminium as front electrode and back electrode respectively to form the organic device. This organic device has been prepared with and without COOH-SWCNT by using spin coating technique. We have measured the steady state current-Voltage (I-V) characteristics of the device to estimate the interfacial barrier height ((cid:1)b) of the device. (cid:1)b is reduced from 0.67 eV to 0.59 eV in the presence of COOH-SWCNT. We have also estimated the (cid:1)b by using Norde’s Method. This method also shows a reduction of interfacial barrier height from 0.72 eV to 0.64 eV due to incorporation of COOH-SWCNT. Both the methods show good consistency with each other. Reduction of the interfacial barrier height in presence of COOH-SWCNT indicates the enhancement of charge injection through the metal-organic dye interface. By suitable doping or addition of COOH-SWCNT within the MG dye it is possible to reduce the barrier height and enhance the current injection through metal-organic dye interface.
关键词： Interfacial Barrier Height,Malachite Green Dye,Metal-Organic Dye Interface,COOH-SWCNT
更新于2025-09-12 10:27:22
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Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide
摘要： The high crystallinity of graphene quantum dots-ZnO nanocomposites is considered to have a significant effect in improving the carrier lifetime for enhanced photocatalytic degradation. The graphene quantum dots-ZnO nanocomposites were synthesized by adding graphene quantum dots solution into starting precursors during the precipitation. Characterization was performed using various techniques. High crystallinity of graphene quantum dots-ZnO nanocomposites is obtained in terms of increased crystal size and decreased dislocation density. The improved crystallinity increases the carrier lifetime on the material surface for the functional improvement of photocatalytic material. Photocatalytic test of methylene blue and methyl orange was performed under UV irradiation. Degradation rate constant reaches the maximum value for both organic dyes for the appropriate preparing condition of graphene quantum dots-ZnO nanocomposites. The graphene quantum dots-ZnO nanocomposites were then applied to degrade commercial glyphosate herbicide contaminants for an agricultural wastewater treatment investigation. The investigation aims to demonstrate a facile useful way of herbicide contaminant reduction for the better health of farmers. The graphene quantum dots-ZnO nanocomposites show an enhancement of the photocatalytic process with improved degradation rate constant (23% increased) in comparison to pure ZnO. Therefore, this work demonstrates that graphene quantum dots-ZnO nanocomposites can be used as a photocatalytic material for degrading organic dyes and commercial herbicide contaminants owing to its low-cost and environmental-friendly properties.
关键词： graphene quantum dots,ZnO,organic dye,photocatalytic degradation,herbicide
更新于2025-09-12 10:27:22
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Co-sensitization of porphyrin and metal-free dye for panchromatic dye-sensitized solar cells
摘要： Porphyrin dyes are outstanding photosensitizers. However, one of the limitations of using porphyrin dyes for dye-sensitized solar cells (DSSC) is their weak absorption in the 500–600 nm region. Co-sensitization approach with two complementary dyes is an approach to solve this problem. So, to enhance the DSSC performance by improving harvesting solar light, we have studied porphyrin dye (LD12) and an organic dye (D149) as the co-sensitizer. This co-sensitized LD12 + D149 device with complementary in their spectral responses shows the power conversion efficiency about 6.8%, which is higher compared with the individual LD12 and D149 solar cells. The obtained photon-to-current conversion efficiency (IPCE) by using this co-sensitized solar cell demonstrates a strong and broad spectral response. This improvement is due to increment of the dyes loading amounts, the fine-matched molecular structures and absorptions of both dyes as the co-sensitization system.
关键词： Dye-sensitized solar cells,Organic dye,Porphyrin,Co-sensitization
更新于2025-09-11 14:15:04
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The third-order nonlinear optical properties of gold nanoparticles-methylene blue conjugation
摘要： Third-order nonlinear properties of a thiazine dye (methylene blue (MB)) and a plasmonic nanoparticle (gold nanoparticles (GNPs)) have been studied by Z-scan method with a 50 mW continues wave (CW) diode pumped solid state laser (DPSSL) operating at 532 nm. The nonlinear parameters (nonlinear refractive (NLR) index (n2) and nonlinear absorption (NLA) coefficient (β)) are determined. The mechanism of the observed NLA and nonlinear refraction is attributed respectively to reverse saturable absorption (RSA) and thermal nonlinear effects. The magnitude of the measured NLR index (n2) and NLA coefficient (β) are founded to be the order of 10?8 cm2/W and 10?4 cm/W respectively. The effect of MB and GNPs on each other has been studied. Z-scan experiments for GNPs-MB conjugation shows noticeable increase in nonlinear parameters.
关键词： Z-scan method,Metal nanoparticles,Nonlinear optics,Organic dye,Nonlinear refractive index,Nonlinear absorption coefficient
更新于2025-09-09 09:28:46
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Elucidating the mode of action for thiophene-based organic D-π-A sensitizers for use in photodynamic therapy
摘要： Photodynamic therapy (PDT) is a non-invasive, selective, and cost-effective cancer therapy. The development of readily accessible templates that allow rapid structural modification for further improvement of PDT remains important. We previously reported thiophene-based organic D-π-A sensitizers consisted of an electron-donating (D) moiety, a π-conjugated bridge (π) moiety, and an electron-accepting (A) moiety as valuable templates for a photosensitizer that can be used in PDT. Our preliminary structure-activity relationship study revealed that the structure of the A moiety significantly influences its phototoxicity. In this study, we evaluated the photoabsorptive, cellular uptake, and photo-oxidizing abilities of D-π-A sensitizers that contained different A moieties. The level of phototoxicity of the D-π-A sensitizers was rationalized by considering those three abilities. In addition, we observed the ability of amphiphilic sensitizers containing either a carboxylic acid or an amide in an A moiety to form aggregates that penetrate cells mainly via endocytosis.
关键词： Organic dye,Photodynamic therapy,Sensitizer,Singlet oxygen,Endocytosis
更新于2025-09-09 09:28:46