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BODIPY platform: a tunable tool for green to NIR OLEDs
摘要： The rapid appearance of organic optoelectronics as a promising alternative to conventional optoelectronics has been largely achieved through the design and development of new conjugated systems. The 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based materials have recently emerged as platforms for many types of applications such as sensors, organic thin-film transistors and organic photovoltaics; however, their application as active materials in organic light-emitting diodes (OLEDs) has only been poorly explored. This review article provides an overview of the most important developments in the structural design and synthesis of BODIPY-based organic semiconductors for application in OLED devices. The results summarised and discussed here include the most relevant results starting from the first application of BODIPY-based materials in OLEDs in 2002 up to the recent discoveries as near-IR emitters also promoted by aggregation-induced emission (AIE). Therefore, this review should inspire new research for future developments of BODIPY-based materials, in particular as ‘metal-free’ infrared emitters.
关键词： optoelectronic devices,BODIPY,OLED
更新于2025-09-11 14:15:04
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Effect of Hot-Electron Injection on the Excited-State Dynamics of a Hybrid Plasmonic System Containing Poly(3-hexylthiophene)-Coated Gold Nanoparticles
摘要： We investigated the photophysical interaction between a conjugated polymer (CP) and a plasmonic gold nanoparticle (Au NP) using transient absorption spectroscopy. We prepared a hybrid system containing CP-stabilized Au NPs by reducing a Au precursor directly with a thiol-terminated poly(3-hexylthiophene) surfactant (P3HT-SH), with the unreacted P3HT-SH chains used as an organic matrix. The P3HT attached to the Au NPs plays two critical roles in our hybrid system: it suppresses exciton quenching from the P3HT matrix to Au NPs (the spacer role) and relays hot electrons induced by surface plasmon resonance of Au NPs to P3HT (the bridge role). Thus, singlet excitons are more slowly relaxed in our hybrid system than those in a neat P3HT film. Our findings may provide important information for development of the high-efficiency hybrid optoelectronic devices.
关键词： surface plasmon resonance,transient absorption spectroscopy,conjugated polymer,photophysical interaction,plasmonic gold nanoparticle,optoelectronic devices,hot-electron injection
更新于2025-09-11 14:15:04
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Effects of GaN capping layer on carrier occupation and interband transition probability of vertically coupled InGaN/GaN quantum dots
摘要： The carrier occupation and the interband transition probability of wurtzite (WZ) coupled InGaN/GaN quantum dots (QDs) were investigated as a function of the distance d between QDs in a range of 30?70?A. The light emission intensity rapidly decreases with increasing the distance d and becomes minimum near d=50?A. This can be explained by the fact that the matrix element values are significantly reduced with increasing d owing to an increase in the internal field and the quasi-Fermi-level separation shows a minimum value at d=50?A. However, the light intensity slightly begins to increase when d exceeds 50?A because the quasi-Fermi-level separation increases with increasing d. These results can be used as the design guideline of the active region in QD-based optoelectronic devices with a high efficiency.
关键词： optoelectronic devices,interband transition probability,GaN capping layer,InGaN/GaN quantum dots,carrier occupation
更新于2025-09-11 14:15:04
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Promising Hybrid Graphene-Silver Nanowire Composite Electrode for Flexible Organic Light-Emitting Diodes
摘要： Thanks to its high transparency, high carrier mobility, and thermal conductivity, graphene is often used as transparent conductive electrode (TCE) in optoelectronic devices. However, the low carrier concentration and high resistance caused by vacancy defects, grain boundaries, and superposed folds in typical graphene films limit its application. In this study, we propose a method to increase both the conductivity and carrier concentration in single-layer graphene (SLG) by blending it with silver nanowires (AgNWs). AgNWs provide connections between grain boundaries of graphene to improve charge-carrier transport. The AgNWs in this study can reduce the resistance of SLG from 650 Ω/? to 27 Ω/? yet still maintain a transmittance of 86.7% (at 550 nm). Flexible organic light-emitting diode, with a maximum 15000 cd m?2 luminance was successfully fabricated using such graphene and AgNWs composite transparent electrodes.
关键词： Silver nanowires,Graphene,Transparent conductive electrode,Optoelectronic devices,Flexible OLED
更新于2025-09-11 14:15:04
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Nanowire network-based photodetectors with imaging performance for omnidirectional photodetecting through a wire-shaped structure
摘要： Wearable photodetectors (PDs) have attracted extensive attention from both scientific and industrial areas due to intrinsic detection abilities as well as promising applications in flexible, intelligent, and portable fields. However, most of the existing PDs have rigid planar or bulky structures which cannot fully meet the demands of these unique occasions. Here, we present a highly flexible, omnidirectional PD based on ZnO nanowire (NW) networks. ZnO NW network-based PDs exhibit the imageable level performance with an on/off ratio of about 104. Importantly, a ZnO NW network can be assembled onto wire-shaped substrates to construct omnidirectional PDs. As a result, the wire-shaped PDs have excellent flexibility, a large light on/off ratio larger than 103, and 360° no blind angle detecting. Besides, they exhibit extraordinary stability against bending and irradiation. These results demonstrate a novel strategy for building wire-shaped optoelectronic devices through a NW network structure, which is highly promising for future smart and wearable applications.
关键词： Wearable photodetectors,Flexible optoelectronic devices,Omnidirectional photodetecting,ZnO nanowire networks
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Al <sub/>x</sub> In <sub/>1-x</sub> As <sub/>y</sub> Sb <sub/>1-y</sub> Separate Absorption, Charge, and Multiplication Avalanche Photodiodes for 2-μm Detection
摘要： We report separate absorption, charge, and multiplication (SACM) avalanche photodiodes (APDs) in the AlxIn1-xAsySb1-y material system for 2-μm detection. Gain, dark current, and low excess noise are demonstrated.
关键词： noise figure,optoelectronic devices,photodetectors,Avalanche photodiodes,dark current
更新于2025-09-11 14:15:04
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Gallium Oxide || Schottky contacts to β-Ga2O3
摘要： The success of β-Ga2O3 as the wide-bandgap semiconductor platform for ultrahigh efficiency electronic and optoelectronic devices relies on the ability to control the properties of ohmic and rectifying, or Schottky, contacts on this material. This chapter focuses on the current status of research and development of Schottky contacts on β-Ga2O3: the materials and structures used and their corresponding electrical properties.
关键词： Schottky contacts,β-Ga2O3,electronic devices,optoelectronic devices,wide-bandgap semiconductor
更新于2025-09-10 09:29:36
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Design principle of all-inorganic halide perovskite-related nanocrystals
摘要： All-inorganic halide perovskite (AIHP)-related (e.g., CsPbBr3, Cs4PbBr6, and CsPb2Br5) nanocrystals have attracted great research interest in the recent three years, owing to their unique optical properties. However, rational structural and compositional control of these nanocrystals is still challenging, particularly using the room temperature saturated recrystallization (RTSR) method. Here, we revealed that the structure and the composition of the nanocrystals fabricated by the RTSR approach are highly dependent not only on the previously thought concentration ratio of PbBr2 and CsBr in N-dimethylformamide (DMF), but the previously neglected absolute concentration and reaction time. This is the reason why pure AIHP-related nanocrystals are usually difficult to prepare using the RTSR method. Through a series of carefully designed experiments, we obtained the evolution trend of the precipitation rate of PbBr2 and CsBr within a wide concentration range in DMF. Based on the understanding of the growth mechanism, we achieved preparation of pure or a mixture of CsPbBr3, Cs4PbBr6, and CsPb2Br5 nanocrystals through either control of the concentration of PbBr2 and CsBr or the reaction time. This study deepens our understanding of the growth mechanism of AIHP-related nanocrystals, paving the way for future engineering of nanocrystals with desired structures and compositions. These structures with desired compositions will definitely have promising applications in optical and optoelectronic devices.
关键词： nanocrystals,All-inorganic halide perovskite,room temperature saturated recrystallization,optical properties,optoelectronic devices
更新于2025-09-10 09:29:36
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Reference Module in Chemistry, Molecular Sciences and Chemical Engineering || Organic–Organic Heterostructures
摘要： Thin films of organic molecules are now of technological importance as the active component in modern electronic and optoelectronic devices, such as organic light-emitting devices, organic thin-film transistors, organic sensors, and organic photovoltaic devices. After a first era of general excitement, it was soon discovered that to be able to rival their inorganic counterparts, one has to control the structure, crystallinity, and morphology during thin-film growth and understand and control their molecular electronic properties. An important topic therein is the formation of interfaces, specifically the organic-metal interface, which acts as the contact. Consequently, the growth and the electronic level alignment (band alignment) of organic molecules on metal surfaces have been extensively studied for the last 20 years. However, organic devices in general comprise more than one organic layer. As a consequence, we also have to consider organic–organic interfaces and the electronic level alignment across them and how heteroorganic films form. In comparison with the huge number of publications dealing with organic film growth on metal, the literature of controlled surface science studies of organic film growth on an organic layer is rather scarce. And indeed, there are a number of challenges one has to be aware of, when investigating organic heterostructure formation. In contrast to metal single-crystal substrates, which are available in every orientation, organic single crystals, large enough to handle with surface science methods, are hardly available, let alone in various orientations. The best approximation to a single crystal is organic thin films composed of crystallites of the same orientation that tile the substrate surface. By careful selection of the inorganic substrate and growth conditions, a number of orientations can be achieved. A second difficulty is that many surface science methods use electrons and thus can be prone to charging and beam damage particular for thick films.
关键词： electronic devices,optoelectronic devices,thin films,organic-metal interface,Organic–organic heterostructures,molecular electronic properties
更新于2025-09-09 09:28:46
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[Nanostructure Science and Technology] Nanowire Electronics || Nanowire-Based Transparent Conductive Electrodes
摘要： Transparent conductive electrodes (TCEs) are important segments in many optoelectronic devices, such as light-emitting diodes (LEDs), liquid crystal displays (LCDs), thin-film transistors (TFTs), touch screens, smart windows, and solar cells. At the end of the 1960s, the industrial demand for transparent conductive oxides (TCOs) started since Sn and In2O3 were used in infrared light filters on low-pressure sodium discharge lamps in order to improve the lamp efficiency. ITO exhibits excellent electrical conductivity and optical transparency which widen its applications in various optoelectronic devices. Among different kinds of emerging technologies, one-dimensional (1-D) nanostructures such as nanowires, nanorods, and nanotubes provide high potential because of their special properties related to high aspect ratio and good crystallinity. 1-D nanostructures not only provide a direct conduction pathway for enhancing charge collection but also increase the surface area which also improves the charge collection. ITO nanostructures with good performance have been successfully synthesized via physical vapor transportation methods. In these ITO nanostructures, ITO nanowires are promising in various applications in nanoscale electronic and optoelectronic devices such as dye-sensitized solar cells (DSSCs) and LEDs.
关键词： Transparent conductive electrodes,TCO,ITO,nanowires,optoelectronic devices
更新于2025-09-09 09:28:46