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Advanced material system for the design of an intermediate band solar cell: Type-II CdTe quantum dots in a ZnCdSe matrix
摘要： We explore CdTe fractional monolayer quantum dots (QDs) in a ZnCdSe host matrix for potential application in an intermediate band solar cell device. Careful consideration has been taken during the initiation of the growth process of QDs by migration enhanced epitaxy, in order to avoid the formation of undesirable interfacial layers that can form due to the lack of common anion between the two materials. A superlattice structure of 100 periods of alternating QD and spacer layers is analyzed by high-resolution X-ray diffraction (XRD) and photoluminescent (PL) spectroscopy. Simple arguments are used following continuum elastic theory to deduce the size of the dots and the strain within the superlattice from XRD data. This is further verified using PL and used in the energy calculations that yield the values of the intermediate band energy. The results suggest that the optimized materials are highly suitable for these high efficiency solar cells.
关键词： migration enhanced epitaxy,ZnCdSe,CdTe,quantum dots,photoluminescent spectroscopy,intermediate band solar cell,high-resolution X-ray diffraction
更新于2025-09-12 10:27:22
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Synthesis, Crystal Structures, and Photoluminescent Properties of Two Supramolecular Architectures Based on Difunctional Ligands Containing Imidazolyl and Carboxyl Groups
摘要： Two new supramolecular architectures, namely, [Cd(L1)2(H2O)]n (1) and [Ni(L2)2(H2O)]n (2), were synthesized by the reaction of corresponding metal salts of CdCl2·2.5H2O and NiCl2·6H2O with 2-(1H-imidazol-4-yl)benzoic acid (HL1) and 3-(1H-imidazol-4-yl)benzoic acid (HL2) respectively, and characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis and powder X-ray diffraction (PXRD). Both HL1 and HL2 ligands are deprotonated to be L1? and L2? anions that coordinate with Cd(II) and Ni(II) atoms to form two-dimensional (2D) layer structure. Topologically, complex 1 is a 2D network with (4, 4) sql topology, while 2 is a typical 63-hcb topology net. Complex 1 exhibits intense light blue emission in the solid state at room temperature.
关键词： supramolecular architectures,noncovalent interactions,photoluminescent property
更新于2025-09-11 14:12:44
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Rapid Fabrication of Photoluminescent Electrospun Nanofibers without the Need of Chemical Polymeric Backbone Modifications
摘要： Photoluminescent electrospun nano?bers were fabricated by incorporating a cyclopentadiene derivative AIE-active luminogen within the polymeric matrices of polyvinylpyrrolidone (PVP), poly(vinylidene ?uoride)-co-hexa?uoropropylene (PVDF-HFP), and poly(methylacrylate) (PMMA) under di?erent solvents. Raman, infrared, and ?uorescence spectroscopy showed the molecular integrity of the AIEgen is maintained during the electrospinning process while exhibiting a strong and uniformed phosphorescent radiative pathway of τ average = 8.9 μs. This method allows for the rapid fabrication of photoluminescent nano?bers into a wide range of polymeric matrices without the need of chemical modi?cations. Taken together, the prepared electrospun phosphorescent nano?bers are a stepping stone for AIEgens to be applied in the digital manufacturing and design of smart textiles.
关键词： smart textiles,photoluminescent,AIE-active luminogen,electrospun nanofibers,polymeric matrices
更新于2025-09-10 09:29:36
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Photoluminescent properties in perylene PVD films: Influence of molecular aggregates and supramolecular arrangement
摘要： Organic thin films are at the forefront of basic studies and applications in the field of physics, chemistry, biochemistry and materials science. For example, the intrinsic supramolecular arrangement, or simply the formation of aggregates may alter the optical and electrical properties, which would impact the potential applications of the material. Here, an attempt is made to correlate the molecular structures of two perylene derivatives, bis butylimido perylene (BuPTCD) and bis phenethylimido perylene (PhPTCD), with their film formation, in particular, the supramolecular arrangement and the photoluminescent properties. Emission spectra show that the PhPTCD has a radiative efficiency (RE) higher than that for BuPTCD when both are in solutions (monomers). Complementary, regarding PVD films, UV-Vis absorption measurements reveal that PhPTCD forms, predominantly, J aggregates, which are responsible for perylene derivative emission. However, BuPTCD PVD films are found to provide higher RE than PhPTCD PVD film. This apparent controversy could be explained considering other features such as crystallinity and molecular organization. The PVD film of BuPTCD is crystalline while PhPTCD PVD film is amorphous; BuPTCD has an edge-on while PhPTCD has a face-on molecular organization in PVD films.
关键词： perylene derivatives,PVD thin films,aggregates,photoluminescent properties,supramolecular arrangement
更新于2025-09-09 09:28:46
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Syntheses, structures, photoluminescence, and magnetism of a series of 3,5-di(3,4-dicarboxylphenyloxy)benzoate-based complexes tuned by N-donor co-ligands and transition metal ions
摘要： Six transition metal–organic complexes based on 3,5-di(3,4-dicarboxylphenyloxy)benzoic acid (H5L) and different N-donor co-ligands, namely, Cu(H3L)(2,20-bpy)(cid:2)H2O (1), Zn2(HL)(2,20-bpy)2 (2), Cd2(HL)(2,20-bpy)2(H2O) (3), Cd2(HL)(phen)4(cid:2)5H2O (4), Cu(H3L)(phen) (5), and Cu(H3L)(4,40-bpy)(cid:2)H2O (6) (2,20-bpy = 2,20-bipyridine, phen = 1,10-phenanthroline, 4,40-bpy = 4,40-bipyridine), were successfully synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Complexes 1 and 5 possess discrete zero-dimensional (0D) structures which are further assembled into three-dimensional (3D) supramolecular frameworks by hydrogen-bonding interactions and p–p stacking interactions. Complexes 2 and 3 display similar 3D frameworks with different topologies. Complex 4 shows a one-dimensional (1D) chain which is further connected into a two-dimensional (2D) supramolecular layer via p–p stacking interactions. Complex 6 exhibits a 1D chain which is further extended into a 3D supramolecular network through hydrogen-bonding interactions. The H5L ligand is partially deprotonated in 1–6. The N-donor co-ligands and transition metal ions have important effects on the architectures of 1–6. The photoluminescent properties of 2–4 and the magnetic properties of 1 and 6 were also studied.
关键词： 3,5-Di(3,4-dicarboxylphenyloxy)benzoic acid,Magnetic property,N-donor co-ligand,Photoluminescent property,Transition metal
更新于2025-09-04 15:30:14