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Synthesis and Properties of Highly Sensitive Ether Ring Fused <i>O</i>-Acyloxime Esters as Photoradical Initiator
摘要： High sensitivity of O-acyloxime ester, which is widely used as a photo radical polymerization initiator for color resist, was investigated. Introduction of an ether ring structure to the periphery of oxime was aimed at increasing rigidity of dye scaffold. As a result, the absorption spectrum at i-line (365 nm) became sharp, the absorption efficiency was greatly improved, and the sensitivity was increased by about five times as much as conventional linear type oximes by improving the radical generation quantum yield.
关键词： Photoradical initiator,i-Line,High sensitivity,Radical curing reaction,Ether ring-fused structure,Carbazole dye,O-Acyloxime ester
更新于2025-09-19 17:15:36
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Organic Electropolymerized Multilayers for Light-Emitting Diodes and Displays
摘要： In electrochemistry, the carbazole generally coupled to dimer but not polymer. This work has reported that organic electropolymerzation (OEP) of 4,4',4"-Tri(N-carbazolyl)triphenylamine (TCTA) would form high crosslinked carbazole polymer by its high activity/reversibility and a synchronous viscosity control. It has significantly improved the OEP film quality of both holes transporting and electroluminescent layers in organic light emitting diodes. As a result, the conductivity and power efficiency of the organic light emitting diodes with TCTA are eight and four times of that without TCTA. A prototype display device with 1.7 inch monochrome passive matrix of 58 ppi under driving chip is successfully fabricated with accurate pixel size and uniform electroluminescence, which makes the big potential of organic electropolymerzation in the electroluminescent application.
关键词： TCTA,Polymerization,Electrochemistry,Carbazole,Organic Light emitting diodes
更新于2025-09-19 17:13:59
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Carbazole-Terminated Isomeric Hole-Transporting Materials for Perovskite Solar Cells
摘要： A set of novel hole-transporting materials (HTMs) based on π-extension through the carbazole units were designed and synthesized via a facile synthetic procedure. The impact of isomeric structural linking on their optical, thermal, electrophysical, and photovoltaic properties were thoroughly investigated combining experimental and simulation methods. Ionisation energies of HTMs were measured and are suitable with a triple-cation perovskite active layer ensuring efficient hole injection. New materials were successfully applied in perovskite solar cells (PSCs) and yielded a promising efficiency up to almost 18% under standard 100 mW cm-2 global AM1.5G illumination and show better stability tendency outperforming that of spiro-OMeTAD. This work provides guidance for the molecular design strategy of effective hole conducting materials for perovskite photovoltaics and similar electronic devices.
关键词： solar cell,carbazole,isomeric semiconductors,perovskite,hole transporting material
更新于2025-09-19 17:13:59
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Synthesis of the diketopyrrolopyrrole/terpyridine substituted carbazole derivative based polythiophenes for photovoltaic cells
摘要： A series of conjugated polythiophenes (PTs) having low band gap energies (PDPP, PDPCz21, PDPCz11), with 2-ethylhexyl-functionalized 2,5-thienyl diketopyrrolopyrrole (TDPP) as the electron acceptor and terpyridine-substituted carbazole (TPCz) as the electron donor, have been synthesized and studied for their applicability in polymer-based photovoltaic cells (PVCs). The thermal stability and solvent solubility of PTs increased upon increasing the content of the TPCz derivative. PVCs were fabricated having the following architecture: indium tin oxide/poly(3,4-ethylenedioxythiophene):polystyrenesulfonate/PT:6,6-phenyl-C71-butyric acid methyl ester (PC71BM)/Ca/Ag. The compatibility between the PT and PC71BM improved upon increasing the TPCz content. The photovoltaic properties of the PDPCz21-based PVCs were superior to those of their PDPP- and PDPCz11-based counterparts.
关键词： electron donor,photovoltaic cells,diketopyrrolopyrrole,electron acceptor,conjugated polythiophenes,terpyridine-substituted carbazole
更新于2025-09-19 17:13:59
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Synthesis of a carbazole-substituted diphenylethylene hole transporting material and application in perovskite solar cells
摘要： In this work, a carbazole-substituted stilbene derivatives hole transporting material, 9,9'-(ethene-1,1-diylbis(4,1-phenylene))bis(3,6-dimethoxy-9H-carbazole) (EPC) was designed and synthesized. The structure was characterized by FT-IR spectroscopy, 1H NMR, 13C NMR and MS. The glass transition temperature is 95.09°C and the 5% weight loss temperature is 423.37°C by DSC/TG analysis. Through the UV-Vis absorption spectrum combined with cyclic voltammetry, the energy level of the highest occupied molecular orbital (HOMO) of EPC and the lowest unoccupied orbital (LUMO) energy level were obtained (-5.38 eV, -2.19 eV). The energy level is well matched with methylamine lead iodine crystals. A mesoporous structure perovskite solar cell was fabricated based on the undoped EPC, and photoelectric conversion efficiency of 13.11% was obtained. After 600 hours of storage in a dark environment at 25°C and 60% relative humidity, 82% of the initial efficiency was obtained. This work provides new ideas for the development of undoped hole transporting materials.
关键词： stability,perovskite solar cell,carbazole,hole transporting material,undoped
更新于2025-09-19 17:13:59
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Molecular Engineering of a New Organic Chromophore with D-π-A Architecture for Dye-Sensitized Solar Cells
摘要： Herein, we report design and synthesis of a new metal-free organic dye N1 derived from (Z)-3-(9-hexyl-9H-carbazol-3-yl)-2-(thiophen-2-yl) acrylonitrile scaffold. In this design, the electron rich carbazole unit is connected to rhodanine-3-acetic acid via cyano vinyl thiophene as π-spacer. Its molecular structure was confirmed by FTIR, NMR, Mass spectral and elemental analyses. The dye was subjected to optical and electrochemical studies in order to investigate their absorption/emission behaviour as well as HOMO/LUMO energies. The DFT studies were performed using Turbomole 7.1V software and the results indicated the existence of proper charge separation between its HOMO and LUMO energy levels.
关键词： DFT,Rhodanine-3-acetic acid,DSSC,FMO level,Carbazole
更新于2025-09-16 10:30:52
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Solar cells sensitized by porphyrin dyes containing a substituted carbazole donor with synergistically extended absorption and suppressed the dye aggregation
摘要： To achieve high power conversion efficiencies (PCEs), three porphyrin sensitizers have been synthesized and explored to simultaneously enhance the photocurrent (Jsc) and photovoltage (Voc). On basis of the XW4, a benzothiadiazole (BTD) unit has been introduced to afford XW57 with the aim to extend the absorption wavelength and enhance the light harvesting ability. As a result, a Jsc of 13.72 mA/cm2 has been obtained for XW57, higher than that of XW4. On this basis, XW58 has been prepared by modifying the carbazole-based donor with two bulky dihexyloxyphenyl groups, and the superior anti-aggregation character raises the Voc from 781 mV (XW4) to 844 mV. When both the BTD unit and the bulky groups are introduced to the acceptor and donor units, respectively, the resulting sensitizer XW59 exhibits a highest PCE value of 7.34% with synergistically enhanced Jsc of 13.19 mA/cm2 and Voc of 793 mV. These results provide further insight into developing high performance dye-sensitized solar cells.
关键词： Sensitizers,Bulky groups,Porphyrin,Carbazole,Dye-sensitized solar cells
更新于2025-09-16 10:30:52
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Organometallic Ir(III) Phosphors Decorated by Carbazole/Diphenylphosphoryl Units for Efficient Solution-Processable OLEDs with Low Efficiency Roll-Offs
摘要： Recently, solution-processable PhOLEDs have been attracting great interest for their low cost and high productivity relative to the vacuum-deposited devices. Similar to vacuum-deposited OLEDs, however, they usually suffer from serious efficiency roll-offs, especially in high brightness. Finding a feasible way and/or designing novel materials to increase efficiencies and reduce roll-offs simultaneously are highly desired. Herein, a new family of solution-processable cyclometalated iridium(III) phosphors with carbazole (Cz) and/or diphenylphosphoryl (Ph2PO) units functionalized main ligands has been designed. Owing to Cz and Ph2PO moieties possessing bulky steric effects, they can suppress the intermolecular strong packing and then decrease TTA effects and emission quenching. Meanwhile, the resulting OLEDs based on the designed phosphors exhibit considerable efficiencies and relatively small efficiency roll-offs. The device based on 4 containing both Cz and Ph2PO units realized a maximum current efficiency of 21.3 cd A?1, accompanied by a small roll-off. By optimization of the configuration of OLEDs, the device performance can be further enhanced, demonstrating their potential for high-performance solution-processable PhOLEDs.
关键词： carbazole,efficiency roll-offs,iridium(III) phosphors,solution-processable PhOLEDs,diphenylphosphoryl
更新于2025-09-16 10:30:52
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Naphthyridine-based thermally activated delayed fluorescence emitters for highly efficient blue OLEDs
摘要： Two TADF emitters 2,7-di(9H-carbazole)-1,8-naphthyridine (Cz-ND) and 2,7-di(3,6-di-tert-butyl-9H-carbazole)-1,8-naphthyridine (tBuCz-ND) were designed and synthesized. Both of the emitters showed high thermal stabilities and strong blue emissions with high photoluminescence quantum yields, and also exhibited excellent TADF properties with small ?EST values. Consequently, blue organic light-emitting diodes (OLEDs) based on Cz-ND and tBuCz-ND were fabricated, which could achieve maximum external quantum efficiencies (EQEmax) of 15.3 and 20.9%, respectively. Moreover, the devices also exhibited relatively narrow band gaps at 79 and 75 nm with the CIE coordinates of (0.15, 0.17) and (0.15, 0.22), respectively.
关键词： OLED,blue emission,carbazole,thermally activated delayed fluorescence,naphthyridine
更新于2025-09-16 10:30:52
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The Crucial Role of Fluorine in Fully Alkylated Ladder Type Carbazole Based Non-fullerene Organic Solar Cells
摘要： Two fused ladder type non‐fullerene acceptors, DTCCIC and DTCCIC‐4F, based on an electron‐donating alkylated dithienocyclopentacarbazole core flanked by electron‐withdrawing non‐fluorinated or fluorinated 1,1‐dicyanomethylene‐3‐indanone (IC or IC‐4F), are prepared and utilized in organic solar cells (OSCs). The two new molecules reveal planar structures and strong aggregation behavior, and fluorination is shown to red shift the optical band gap and down shift energy levels. OSCs based on DTCCIC‐4F exhibit a power conversion efficiency of 12.6 %, much higher than that of DTCCIC based devices (6.2 %). Microstructural studies reveal that while both acceptors are highly crystalline, bulk heterojunction blends based on the non‐fluorinated DTCCIC result in overly coarse domains, while blends based on the fluorinated DTCCIC‐4F exhibit a more optimal nanoscale morphology. These results highlight the importance of end group fluorination in controlling molecular aggregation and miscibility.
关键词： fluorine effect,carbazole,fully alkylated side chains,organic solar cells,non‐fullerene acceptors
更新于2025-09-16 10:30:52