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A Turn-on Fluorescence Probe For Rapid, Sensitive And Visual Detection of Formaldehyde
摘要： The sensitive and selective determination of formaldehyde is very significant in food safety and environmental protection. In this paper, a novel perylenediimide based fluorescent probe for formaldehyde has been constructed. The probe can be used to detect formaldehyde rapidly, facilely and sensitively, and it exhibited an obvious fluorescence enhancement (at 582 nm) within 1 minutes, and the enhanced yellow fluorescence can be easily observed by the naked eyes. Importantly, the probe showed strong anti-interference abilities to protons and other small molecules. Moreover, the density functional theory was performed to understand the Turn-On process and the probe was successfully used to detect formaldehyde in living cells.
关键词： turn-on,anti-interference,perylenediimide,formaldehyde,fluorescence
更新于2025-09-23 15:23:52
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Corea??twisted tetrachloroperylenediimides: lowa??cost and efficient nona??fullerene organic electrona??transporting materials for inverted planar perovskite solar cells
摘要： In this work, we introduced the core-twisted tetrachloroperylenediimides (ClPDIs) as new efficient electron-transporting materials (ETMs) to replace the commonly used fullerene acceptor (PC61BM) in inverted planar perovskite solar cells (PSCs). The ClPDI shows a low-lying LUMO energy level of -3.95 eV, which is compatible to the conduction band of MAPbI3-XClX (-3.90 eV). In addition, we investigated the role of the alkyl side chain length at the imide position on ClPDI in modulating the molecular solubility, aggregation capacity for charge transport properties, surface hydrophobicity and perovskite solar cell performances. The device based on ClPDI-C4 (ClPDI with n-butyl side chains) as ETM achieved a maximum power conversion efficiency (PCE) of 17.3% under the standard AM 1.5G illumination, which is very competitive to the reference device employing PC61BM/C60 (PCE= 17.2%) as ETM. Moreover, the devices with ClPDIs as ETMs exhibit better device stability than that with PC61BM/C60. This work highlights the great potential of ClPDI derivatives as the low cost (~2.0 USD per gram) and efficient ETMs to achieve efficient solution-processed inverted PSCs. We believe this class of ClPDI derivatives that will further promote the performance and stability of PSCs after extended investigation.
关键词： perovskite solar cells,electron-transporting material,perylenediimide,non-fullerene
更新于2025-09-19 17:13:59
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Fluorine Tuning of Morphology, Energy Loss, and Carrier Dynamics in Perylenediimide Polymer Solar Cells
摘要： We investigate backbone fluorination effects in bulk-heterojunction (BHJ) polymer solar cells (PSCs) with the fluorine-poor PBDTT-FTTE and fluorine-rich PBDTTF-FTTE donor polymers, paired with the perylenediimide (PDI) 3D “propeller acceptor” Ph(PDI)3. The PBDTTF-FTTE:Ph(PDI)3 devices exhibit a > 50 % power conversion efficiency (PCE, up to 9.1%) increase versus PBDTT-FTTE:Ph(PDI)3. This enhancement reflects structurally optimized phase separation due to templating effects, affording reduced energy loss, higher electron mobility, greater free charge lifetimes and yields, and lower bimolecular recombination, as quantified by UPS, AFM, TEM, GIWAXS, SCLC, light intensity dependence measurements, and fs/ns transient absorption (TA) spectroscopy. In PBDTTF-FTTE, the DFT-computed dipole orientations of the ground and excitonic states is nearly antiparallel, explaining the longer free charge lifetimes, minimized recombination, and lowered exciton binding energy. The PBDTTF-FTTE:Ph(PDI)3 performance enhancement vs. that of the fluorine-poor PBDTT-FTTE:Ph(PDI)3 analogue as well as the overall PSC performance exceeds that of the corresponding PC71BM- and ITIC-Th-based cells.
关键词： Perylenediimide,Energy loss,Fluorine tuning,Carrier dynamics,Morphology,Polymer solar cells
更新于2025-09-16 10:30:52
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Impact of alkyl chain branching positions on molecular packing and electron transport of dimeric perylenediimide derivatives
摘要： Side chains play a critical role in tuning intermolecular interaction and charge transport in organic semiconductors. Here, we have systematically investigated the impact of branching positions of the alkyl side chains on the molecular packing and electron transport properties of a series of bay-linked dimeric perylenediimide (PDI) derivatives by atomistic molecular dynamics simulations in combination with charge transfer rate theory and kinetic Monte Carlo simulations. The results show that despite of different branching positions of the alkyl chains, π –π stacking is effectively inhibited for all the dimeric PDI derivatives. As the branching position moves away from the PDI backbone, the appearance of the alkyl atoms around the PDI backbone will first decrease and then increase. Correspondingly, the short contacts between the PDI moieties are first enhanced and then reduced. In particular, when the branching position is at the third carbon atom, the intermolecular connectivity becomes the most effective and the electron mobility is significantly increased by 2 times.
关键词： Electron mobility,Branching position,Perylenediimide,Molecular packing
更新于2025-09-10 09:29:36