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Silicon Nanoparticle Films Infilled with Al <sub/>2</sub> O <sub/>3</sub> using Atomic Layer Deposition for Photosensor, Light Emission and Photovoltaic Applications
摘要： Solution-processed thin films of crystalline silicon nanoparticles (Si NPs) have a great potential for a wide variety of electronic and optoelectronic applications. However, such films are inherently unstable due to their huge surface-to-volume ratios and high surface energies, making them prone to degradation associated to spontaneous oxidation in ambient conditions. In this work, we explore the use of atomic layer deposition (ALD) as a means to stabilize and potentially functionalize solution-processed thin films of Si NPs for (opto)electronics e.g. thin-film transistors, photosensors, light-emitting devices, and photovoltaics. We prepared films of randomly distributed Si NPs with ultrashort surface ligands (Si-H termination) using wet-chemistry and spray-coating and then use ALD to infill the films with Al2O3. Through microscopy and optical structural/morphological analysis, we demonstrate the achievability of ALD infilling of films of Si NPs and probe the stability of these films against oxidation. Moreover, we show that the ALD infilling leads to changes in the light emission properties of the Si NP films, including a relative quenching of disorder-related emission features and variations in surface-related dielectric confinement effects. Our studies reveal ALD as a relevant technique toward manufacturing de facto robust, functional nanomaterials based on Si NPs and on nanoscale silicon materials more generally.
关键词： Photoluminescence properties,Nanoparticle film infilling,Silicon nanocrystal films,Air stability,Atomic layer deposition
更新于2025-09-23 15:21:01
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Synthesis, structure and photoluminescence properties of a three-dimensional cadmium(II) (4,5)-connected coordination network
摘要： The assembly of coordination polymers from metal ions and organic moieties is currently attracting considerable attention in crystal engineering due to their intriguing architectures and potential applications as functional materials. A new coordination polymer, namely poly[[(cid:2)2-trans-1,2-bis(pyridin-3-yl)-ethylene-(cid:3)2N:N0]bis((cid:2)4-4,40-oxydibenzoato-(cid:3)6O:O,O0:O00:O00,O000)dicadmium(II)], [Cd2(C14H8O5)2(C12H10N2)]n or [Cd2(4,40-OBB)2(3,30-BPE)]n, has been synthesized by the self-assembly of Cd(NO3)2(cid:2)4H2O, 4,40-oxydibenzoic acid (4,40-H2OBB) and trans-1,2-bis(pyridin-3-yl)ethene (3,30-BPE) under hydrothermal conditions. The title compound was structurally characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction analysis. Each CdII centre is coordinated by six carboxylate O atoms from four different 4,40-OBB2(cid:3) ligands and by one pyridyl N atom form a 3,30-BPE ligand. Adjacent crystallographically equivalent CdII ions are bridged by 4,40-OBB2(cid:3) ligands, affording a two-dimensional [Cd(4,40-OBB)]n net extending in the ac plane. Neighbouring [Cd(4,40-OBB)]n nets are interlinked by 3,30-BPE along the b axis to form a three-dimensional (3D) [Cd2(4,40-OBB)2(3,30-BPE)]n coordination network. In the network, each CdII centre is linked by four different 4,40-OBB2(cid:3) ligands and one 3,30-BPE ligand. Meanwhile, each 4,40-OBB2(cid:3) ligand connects four separate CdII ions. Therefore, if the 4,40-OBB2(cid:3) ligands and CdII ions are considered as 4- and 5-connecting nodes, the structure of the title compound can be simplified as a 3D (4,5)-connected binodal framework with the rare (4462)(4466) TCS topology (Pearson, 1985; Blake et al., 2011). The thermal stability and photoluminescence properties of the title compound have also been investigated.
关键词： coordination polymer,crystal engineering,crystal structure,photoluminescence properties,TCS network,cadmium(II),topology
更新于2025-09-23 15:21:01
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Spectral photoluminescence properties of YAG: Ce, R (R: Gd3+, Pr3+, Gd3+ and Pr3+) transparent fluorescent thin film prepared by pulse laser deposition
摘要： In order to overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED), YAG:Ce, R (R: Gd3t and Pr3t) fluorescent thin films were prepared by pulse laser deposition (PLD). The composition and microstructure, photoluminescence properties, and red-enhanced mechanism of co-doped YAG fluorescent thin films, as well as the electroluminescence behavior of the corresponding WLEDs were investigated. Results showed that the doping of Pr3t caused the emission spectrum energy of Ce3t to migrate, and an emission peak appeared at 606 nm in the red region. The doping of Gd3t caused the emission spectrum of Ce3t to shift to the red region, and the main peak position of the Ce3t emission spectrum is red-shifted from 523 nm to 548 nm. The YAG:Ce,Pr,Gd fluorescent film not only realized the improvement of red light components and red-shift, but also increased the energy transmission efficiency from 33.3% to 51.9%. Moreover, results of the color coordinate analysis also showed that the co-doping of Gd3t and Pr3t made the luminescence closer to the red region, reducing the color temperatures and hues changed to warm. Thus, tri-doped transparent fluorescent thin film were prospective for WLED application.
关键词： Photoluminescence properties,Transparent thin film,Pulse laser deposition,YAG:Ce,Tri-doped YAG
更新于2025-09-23 15:19:57
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Substrate Temperature Dependence of the Properties of Single-layer MoS2 Film deposited by Using Pulsed Laser Deposition
摘要： Single-layer MoS2 ?lms were deposited on sapphire substrates by using pulsed laser deposition. The substrate temperature dependence of the structural, optical and photoluminescence properties of single-layer MoS2 ?lms was investigated. An increased substrate temperature improved the surface morphology and the crystal quality of the MoS2 ?lms. Moreover, the absorption and the photoluminescence properties of the MoS2 ?lms were enhanced. In addition, the mechanism underlying the e?ect of substrate temperature on the properties of single-layer MoS2 ?lms is discussed.
关键词： Optical properties,Substrate temperature,Crystal quality,Single-layer MoS2 ?lm,Photoluminescence properties
更新于2025-09-12 10:27:22
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The effects of gadolinium doping on the structural, morphological, optical, and photoluminescence properties of zinc oxide nanoparticles prepared by co-precipitation method
摘要： Pure and gadolinium (Gd)-doped zinc oxide (ZnO) nanoparticles were prepared by co-precipitation method. The EDS analysis confirmed the presence of Gd3+ ions in ZnO lattice. The X-ray diffraction measurement indicated the formation of hexagonal wurtzite structure for both pure and Gd-doped ZnO nanoparticles. The structural parameters of nanoparticles such as lattice constant, crystallite size, dislocation density, micro strain and other lattice parameters were calculated from XRD data. FESEM images of nanoparticles showed that the grain morphology of nanoparticles tends to hexagonal form by introducing Gd3+ ions into the ZnO lattice. The presence of functional groups and chemical bonding attributed to ZnO was confirmed by FT-IR measurement. The optical properties of nanoparticles were investigated by UV–Vis spectroscopy. The UV–Vis absorbance spectra, for Gd-doped samples, illustrated a blue shift by increasing Gd concentration. Also, the band gap of nanoparticles increased by increasing Gd concentration. The photoluminescence spectra of Gd-doped nanoparticles showed that the intensity of green luminescence increases by substitution of Gd3+ ions into the ZnO lattice attributed to the oxygen vacancies.
关键词： structural properties,morphological properties,co-precipitation method,gadolinium doping,zinc oxide nanoparticles,optical properties,photoluminescence properties
更新于2025-09-10 09:29:36