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Multifunctional Optoelectronic Device Based on an Asymmetric Active Layer Structure
摘要： A single device with a variety of capabilities is highly attractive for the increasing demands of complex and multifunctional optoelectronics. A hybrid heterojunction formed between CsPbBr3 halide perovskite and chalcogenide quantum dots is demonstrated. The heterojunction served as an asymmetric active layer allows not only charge separation/exciton dissociation in a benign process, but also carrier injection/recombination with the suppression of bulk and interfacial nonradiative recombination. An individual device incorporating such a heterojunction is therefore implemented with an integration of proof-of-concept functions, including a voltage controllable multicolor light-emitting diode, an exceptionally high photovoltage energy-harvesting device, and an ultrafast photosensitive detector. The figures of merit of the light-emitting diode remarkably surpass those of the corresponding single-active-layer device, particularly in terms of its bright electroluminescence and superior long-term stability. The asymmetric active layer concept provides a feasible route to design efficient multifunctional and monofunctional devices in the future.
关键词： perovskite,asymmetric active layer,heterojunction,multifunctional optoelectronic device,multicolor electroluminescence
更新于2025-09-19 17:15:36
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Wavelength-decoupled geometric metasurfaces by arbitrary dispersion control
摘要： Conventional multicolor metaholograms suffer from the fundamental limitations of low resolution and irreducible noise because the unit structure functionality is still confined to a single wavelength. Here, we propose wavelength-decoupled metasurfaces that enables to control chromatic phase responses independently in a full range from 0 to 2π for each wavelength. The propagation phase associated with the geometric phase of rectangular dielectric nanostructures plays a critical role to embed a dual phase response into a single nanostructure. A multicolor metahologram is also demonstrated to verify the feasibility of our method that breaks through the fundamental constraints of conventional multicolor meta-holograms. Our approach can be extended to achieve complete control of chromatic phase responses in the visible for general dual-wavelength diffractive optical elements.
关键词： wavelength-decoupled,multicolor metaholograms,metasurfaces,chromatic phase responses,dielectric nanostructures
更新于2025-09-19 17:13:59
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Protein‐specific, multi‐color and 3D STED imaging in cells with DNA‐labeled antibodies
摘要： Photobleaching is a major challenge in fluorescence microscopy, in particular if high excitation light intensities are used. Signal-to-noise and spatial resolution may be compromised, which limits the amount of information that can be extracted from an image. Photobleaching can be bypassed with exchangeable labels, which transiently bind to and off a target and thereby replenish destroyed labels by intact ones from a reservoir. Here, we demonstrate confocal and STED microscopy with short, fluorophore-labeled oligonucleotides that transiently bind to complementary oligonucleotides attached to protein-specific antibodies. The constant exchange of fluorophore labels in DNA-based STED imaging bypasses photobleaching that occurs with covalent labels. We show that this concept is suitable for targeted, two-color STED imaging of whole cells.
关键词： multicolor imaging,DNA-PAINT,STED microscopy,fluorescence,fluorescent probes
更新于2025-09-19 17:13:59
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Monolithic integration of visible GaAs and near-infrared InGaAs for multicolor photodetectors by using high-throughput epitaxial lift-off toward high-resolution imaging systems
摘要： In this study, multicolor photodetectors (PDs) fabricated by using bulk p-i-n-based visible GaAs and near-infrared inGaAs structures were monolithically integrated through a high-throughput epitaxial lift-off (ELO) process. To perform multicolor detection in integrated structures, GaAs PDs were transferred onto inGaAs pDs by using a Y2o3 bonding layer to simultaneously detect visible and near-infrared photons and minimize the optical loss. As a result, it was found that the GaAs top PD and InGaAs bottom PD were vertically aligned without tilting in x-ray diffraction (XRD) measurement. A negligible change in the dark currents for each PD was observed in comparison with reference PDs through electrical characterization. Furthermore, through optical measurements and simulation, photoresponses were clearly revealed in the visible and near-infrared band for the material’s absorption region, respectively. Finally, we demonstrated the simultaneous multicolor detection of the visible and near-infrared region,which implies individual access to each PD without mutual interference. These results are a significant improvement for the fabrication of multicolor PDs that enables the formation of bulk-based multicolor PDs on a single substrate with a high pixel density and nearly perfect vertical alignment for high-resolution multicolor imaging.
关键词： high-resolution imaging,multicolor photodetectors,InGaAs,epitaxial lift-off,GaAs
更新于2025-09-12 10:27:22
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Quantum Dot-Based Simultaneous Multicolor Imaging
摘要： Quantum dots have attracted a great deal of attention among researchers in optical imaging because of their unique physicochemical properties. Their adjustable size allows quantum dots to emit visible fluorescence with different wavelengths excited by a single light source, allowing them to play an unmatched role in multitarget simultaneous multicolor imaging of tissues and cells compared with other molecular biotechnologies and traditional fluorescent materials. This technology affords real-time observation in situ of multiple biomarkers, allowing us to quantify their expression levels, and helping us to gain a deeper understanding of the interactions among biomolecules and the relationship between biomolecules and disease occurrence, progression, and prognosis. This has potential to aid in clinical diagnosis and treatment decision making.
关键词： Molecular imaging,Imaging,Biomarkers,Multicolor,Quantum dots
更新于2025-09-12 10:27:22
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MORE EFFECTIVE SCREENING FOR EPIRETINAL MEMBRANES WITH MULTICOLOR SCANNING LASER OPHTHALMOSCOPE THAN WITH COLOR FUNDUS PHOTOGRAPHS
摘要： Purpose: To assess the ability of the multicolor scanning laser ophthalmoscope (MC-SLO) to screen for epiretinal membranes (ERMs). Methods: A retrospective cross-sectional study of 35 eyes of 32 patients with an ERM detected by optical coherence tomography and 46 eyes of 23 healthy volunteers. The detection of the ERM was graded into three visibility scores—1, not visible, 2, barely visible, and 3, clearly visible—by retina specialists or by ophthalmology residents. The sensitivity and speci?city of the detection with the merged image of the MC-SLO or color fundus photographs (CFPs) were calculated. Results: The sensitivity for ERM detection in the MC-SLO and CFP were 91.4% and 65.7% by specialists and 97.1% and 60.0% by residents. The speci?city for both devices was 100% by specialists and residents. The visibility score for the MC-SLO images were signi?cantly higher than that for the CFP by both specialists and residents. In addition, the visibility score for the MC-SLO determined by residents was signi?cantly higher than that for the CFP by specialists. Conclusion: The detection of an ERM is better with the MC-SLO images than with CFP. Furthermore, the ERM detection in the MC-SLO images by residents was comparable to that by specialists.
关键词： epiretinal membrane,multicolor scanning laser ophthalmoscope
更新于2025-09-12 10:27:22
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Protein-specific, multi-color and 3D STED imaging in cells with DNA-labeled antibodies
摘要： Photobleaching is a major challenge in fluorescence microscopy, in particular if high excitation light intensities are used. Signal-to-noise and spatial resolution may be compromised, which limits the amount of information that can be extracted from an image. Photobleaching can be bypassed with exchangeable labels, which transiently bind to and off a target and thereby replenish destroyed labels by intact ones from a reservoir. Here, we demonstrate confocal and STED microscopy with short, fluorophore-labeled oligonucleotides that transiently bind to complementary oligonucleotides attached to protein-specific antibodies. The constant exchange of fluorophore labels in DNA-based STED imaging bypasses photobleaching that occurs with covalent labels. We show that this concept is suitable for targeted, two-color STED imaging of whole cells.
关键词： multicolor imaging,STED microscopy,fluorescent probes,DNA-PAINT,fluorescence
更新于2025-09-11 14:15:04
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Interfacial Energy Transfer in Hollow Double-Shelled TiO <sub/>2</sub> : <i>x</i> %Eu <sup>3+</sup> @SiO <sub/>2</sub> : <i>y</i> %Tb <sup>3+</sup> Nanospheres for Tissue Imaging
摘要： In this paper, hollow double-shelled TiO2:x%Eu3+@SiO2:y%Tb3+ nanospheres (C1-Ti-x/Si-y) were fabricated using carbon spheres as hard template followed by a two-step sol-gel coating process. The results demonstrate that there is strong interaction between inner TiO2 layer and outer SiO2 layer, which can be characterized by the high surface content of Ti-O-Si bonds. The strong interaction makes it possible to achieve efficient energy transfer from Tb3+ to Eu3+ ions through crossing the double-shelled interface. The interfacial energy transfer (IET) efficiency from Tb3+ to Eu3+ions is strongly influenced by the doping concentration of Eu3+ ions whose maximum is determined to be 30.2%. Furthermore, the surface of inner TiO2 layer is modified by the outer SiO2 layer through this strong interaction, which significantly enhances the emission intensity and suppresses the concentration quenching of Eu3+ ions. Under 377 nm excitation, C1-Ti-x/Si-y simultaneously exhibits red and green emissions derived from Eu3+ and Tb3+ ions, respectively. Moreover, by varying doping concentration of Tb3+ and Eu3+ ions, the luminescence color of the samples can be tuned from green to orange and red. The characterization results show that our proposed phosphors may provide potential applications in tissue imaging.
关键词： Multicolor phosphors,Hollow double-shelled nanostructure,Interfacial energy transfer,Concentration quenching suppressed,Surface modification
更新于2025-09-11 14:15:04
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On the preparation of Tri-vanadium hepta-oxide thin films for electrochromic applications
摘要： Nanostructured Tri-vanadium hepta-oxide (V3O7) thin films for electrochromic devices having high optical modulation, enhanced optical density, multi-coloration, fast switching time, and better reversibility, were prepared by nebulizer spray pyrolysis technique with 400 oC substrate temperature. A monoclinic structured, V3O7 films having nano rod-like morphology have been observed from structural and surface morphological analyzes, respectively. Surface chemical analyzes revealed the mixed vanadium oxidation states that favored the formation of relatively stable V3O7 thin films. Electrochromic performance of the films was examined by electrochemical cyclic voltammetry (CV) studies with multiple CV scan rate. The multiple peaks present in the anodic and cathodic curves prove the multi-coloration behavior of the films with appreciable optical modulation in the visible range of light.
关键词： V3O7,Nano rod structure,Multicolor display,Nebulizer Spray Pyrolysis
更新于2025-09-11 14:15:04
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Multicolor emission from non-conjugated polymers based on a single switchable boron chromophore
摘要： Multicolor emissive and responsive materials are highly attractive due to their potential applications in various fields, and polymers are preferred for their good processability and high stability. Herein, we report a series of new polymers based on a methacrylate monomer containing a switchable boron chromophore. In spite of the unconjugated nature, interestingly, the homopolymers from this monomer display rare multicolor fluorescence in solution that is highly dependent on the degree of polymerization (DP). With an ascending DP, the local concentration of the chromophore increases, leading to a higher propensity for switching the blue emitting tricoordinate boron chromophore to the red emitting tetracoordinate one. The homopolymers also display temperature and solvent-dependent emission colour change. Furthermore, pure white-light emission could be achieved in various solvents by precisely tuning the homopolymer molecular weight, or in films/solid state by copolymerizing the emissive boron monomer with non-emissive monomers in an appropriate ratio.
关键词： Multi-responsiveness,Non-conjugated Polymer,Single Chromophore,White Light Emission,Multicolor Emission
更新于2025-09-10 09:29:36