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- 2019
- 2018
- IoT
- Organic photovoltaic
- Sensors
- UHF RFID Tags
- Energy Harvesting
- organic light emitting diodes
- conjugated polymer
- polarized emission
- chiral dopant
- Circular polarization
- Optoelectronic Information Science and Engineering
- Optoelectronic Information Materials and Devices
- Hanyang University
- Univ. Grenoble Alpes, Grenoble INP
- Dracula Technologies
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Reversible Optical Writing and Data Storage in an Anthracene-Loaded Metal-Organic Framework
摘要： Metal-organic frameworks (MOFs) enable the design of host-guest systems with specific properties. In this work, we show how confinement of anthracene in a well-chosen MOF host leads to reversible yellow-to-purple photoswitching of fluorescence emission. This behavior has not been observed before for anthracene, either in pure form or adsorbed in other porous hosts. The photoresponse of the host-guest system is caused by the photodimerization of anthracene, which is greatly facilitated by the pore geometry, connectivity and volume as well as the structural flexibility of the MOF host. The photoswitching behavior is used to fabricate photopatternable and erasable surfaces that, in combination with data encryption and decryption, hold promise in product authentication and secure communication applications.
关键词： product authentication,photoswitching,anthracene,metal-organic frameworks,host-guest system
更新于2025-09-04 15:30:14
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High Performance Thermally Activated Delayed Fluorescence Sensitized Organic Light‐Emitting Diodes
摘要： Recently, organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) materials have aroused huge attention in both academia and industry. Compared with fluorescent and phosphorescent materials, TADF materials can theoretically capture 100 % excitons without incorporating noble metals, making them effective emitters and hosts for OLEDs simultaneously. Here, in this review, our recent works on mechanisms and materials of high performance TADF-sensitized phosphorescent (TSP) OLEDs, TADF-sensitized fluorescent (TSF) OLEDs and TADF-sensitized TADF (TST) OLEDs are summarized. Finally, we propose the outlook for the further development and application of TADF-sensitized OLEDs.
关键词： bipolar host,Dexter energy transfer,organic light-emitting diodes,F?rster energy transfer,thermally activated delayed fluorescence
更新于2025-09-04 15:30:14
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Carbon nanotube based metal-organic framework nanocomposites: Synthesis and their photocatalytic activity for decolorization of colored wastewater
摘要： Herein, Materials Institute Lavoisier (MIL-125(Ti))/carbon nanotube (CNT) nanoporous composites (MIL/CNT) were synthesized by hydrothermal method. Different amounts of CNT (0.01 g and 0.03 g) were used to synthesize nanocomposites (denoted as MIL/CNT(0.01) and MIL/CNT(0.03), respectively). The synthesized nanomaterials (MIL, MIL/CNT(0.01) and MIL/CNT(0.03)) were characterized by XRD, FTIR, TGA, BET, SEM, and zeta potential and used for photocatalytic dye degradation. Reactive Black 5 (RB5) was used as a model pollutant. The zeta potential of MIL and MIL/CNT (0.01) were ?27.7 mV and 19.2 mV, respectively. The data showed that that MIL/CNT(0.01) nanocomposite had higher photocatalytic dye degradation due to the synergistic effect of CNT. Dye decolorization by the nanomaterials followed the zero-order kinetics reaction. The decolorization rate was 0.0015, 0.0019, 0.0024 mg/L min for MIL, MIL/CNT(0.01) and MIL/CNT(0.03), with the correlation coefficient of 0.9639, 0.9906, and 0.9757, respectively. The synthesized catalysts were reusable over two cycles.
关键词： Metal-organic framework-carbon nanotube nanocomposite,Photocatalytic dye degradation,Reactive Black 5,Synthesis
更新于2025-09-04 15:30:14
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Synthesis and characterization of heterocyclic conjugated polymers containing planar Benzo[c]cinnoline and tetraazapyrene structures for organic field-effect transistor application
摘要： Heterocyclic conjugated polymers BZCTVT and TAPTVT containing tetraazapyrene (TAP) and benzo[c]cinnoline (BZC), respectively, were prepared by using Stille coupling polymerization in microwave reactor. TAP and BZC act as acceptors and thiophene-vinylene-thiophene (TVT) acts as donors. Alkylated thiophene is the linker between acceptor and donor. This is the first time that tetraazapyrene was incorporated into conjugated polymers. The films of BZCTVT and TAPTVT showed maximum absorption wavelength at 522 and 534 nm, respectively. From cyclic voltammertry measurement, TAPTVT and BZCTVT exhibited low LUMO (-3.61 and -3.47 eV) and HOMO (-5.64 and -5.63 eV) energy levels. Even though BZC and TAP were planar structures, BZCTVT and TAPTVT showed large dihedral angles between alkylated thiophene and TVT (10.8-22.6o), and between alkylated thiophene and BZC and TAP (22.2-30.3o) based on their simulated energy-minimized geometry. The bottom-gate, top-contact OFETs based on TAPTVT and BZCTVT exhibited only p-channel behavior with hole mobility of 4.63 × 10-4 and 1.04 × 10-4 cm2 V-1 s-1 and current on/off ratios greater than 104 after thermal annealing. Grazing incidence X-ray diffraction (GIXRD) patterns suggested that thin films of TAPTVT and BZCTVT preferred edge-on orientation.
关键词： heterocyclic conjugated polymers,organic field-effect transistor,tetraazapyrene,Stille coupling polymerization,benzo[c]cinnoline
更新于2025-09-04 15:30:14
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A Highly Stable Organic Radical Cation
摘要： Functionalization of a methylviologen with four methyl ester substituents significantly facilitates the first two reduction steps. The easily generated radical cation shows markedly improved air stability compared to the parent methylviologen, making this derivative of interest in organic electronic applications.
关键词： organic electronics,air stability,methylviologen,radical cation,electron-withdrawing groups
更新于2025-09-04 15:30:14
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Building two-dimensional metal–organic networks with tin
摘要： We show that Sn atoms combined with organic ligands can be used to build 2D coordination networks on Au(111) surfaces. The use of metal–organic bonding has been recognized as a powerful strategy for the generation, directly on solid surfaces, of 2D modular functional materials with potential application in catalysis, organic electronics, and magnetism. This has lead to the important progress observed in recent years in the engineering of a great variety of surface-supported 2D metal–organic networks (MONs). In this Communication, we report the first example of a surface-confined Sn-based MON. With only a few studies of surface-supported MONs based on p-block metals reported in the literature, the possibilities of building modular 2D MONs based on this group of metals remains almost unexplored to date. Tin, with formal oxidation states 2 and 4, forms a large diversity of metal–organic compounds (organotin compounds) which have a wide range of applications ranging from all sorts of biological activity to industrial catalytic processes. Organotin compounds have also attracted the attention of the condense-matter community, especially since stanene-cyanide was proposed as a candidate topological-insulator material. We thus investigated the synthesis, directly on Cu(100) and Au(111) surfaces, of Sn-based MONs using 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules as ligands.
关键词： Au(111) surfaces,TCNQ molecules,2D coordination networks,Sn-based MON,metal–organic bonding
更新于2025-09-04 15:30:14
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Robust Design of Digital Circuits on Foil || Design Case: RFID Tags
摘要： In this chapter, we have presented the designs and technology evolutions that will allow thin-film electronics on plastic foil to fulfill the required specifications for EPC item-level tagging. In particular, we have shown that many of these specifications can be met. A 64-bit organic RFID tag has been elaborated; it is inductively coupled at a base carrier frequency of 13.56 MHz. The complexity of the chip has been increased to a 128-bit transponder chip. Also a basic ALOHA anti-collision protocol and WORM memory have been integrated. EPC-based data rates of 50 kb/s have been reached by downscaling of the technology. These data rates could also be met by using high-performing metal-oxide transistors or by the integration of diode-load or complementary logic. Recently, we demonstrated the possibility for plastic RFID tags to implement a bi-directional communication to realize an anti-collision protocol.
关键词： EPC,WORM memory,thin-film electronics,RFID,bi-directional communication,transponder chip,anti-collision protocol,organic electronics
更新于2025-09-04 15:30:14
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Chromium-Doped Zinc Gallogermanate@Zeolitic Imidazolate Framework-8: A Multifunctional Nanoplatform for Rechargeable In Vivo Persistent Luminescence Imaging and pH-Responsive Drug Release
摘要： Multifunctional theranostic nanoplatforms greatly improve the accuracy and effectiveness in tumor treatments. Much effort has been made in developing advanced optical-imaging-based tumor theranostic nanoplatforms. However, autofluorescence and irradiation damage of the conventional fluorescence imaging technologies as well as unsatisfied curative effects of the nanoplatforms remain great challenges against their wide applications. Herein, we constructed a novel core-shell multifunctional nanoplatform, i.e. chromium-doped zinc gallogermanate (ZGGO) near-infrared (NIR) persistent luminescent nanoparticles (PLNPs) as a core and zeolitic imidazolate framework-8 (ZIF-8) as a shell (namely ZGGO@ZIF-8). The ZGGO@ZIF-8 nanoplatform possessed dual functionalities of the autofluorescence-free NIR PersL imaging as well as the pH-responsive drug delivery, thus was highly expected in tumor theranostics. Notably, the loading content of doxorubicin (DOX) in ZGGO@ZIF-8 (?LC = 93.2%) was quite high, and the drug release of DOX-loaded ZGGO@ZIF-8 was accelerated in an acidic microenvironment such as tumor cells. The ZGGO@ZIF-8 opens up a new material system in the combination of PLNPs with metal–organic frameworks (MOFs) and may offer new opportunities for the development of advanced multifunctional nanoplatforms for tumor theranostics, chemical sensing, and optical information storage.
关键词： persistent luminescence imaging,metal–organic frameworks,core-shell nanostructure,pH-responsive drug delivery,tumor theranostics
更新于2025-09-04 15:30:14
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Electronic structure of the polymer-cathode interface of an organic electroluminescent device investigated using operando hard x-ray photoelectron spectroscopy
摘要： The electronic structure of a polymer-cathode interface of an operating organic light-emitting diode (OLED) was directly investigated using hard X-ray photoelectron spectroscopy (HAXPES). The potential distribution pro?le of the light-emitting copolymer layer as a function of the depth under the Al/Ba cathode layer in the OLED depended on the bias voltage. We found that band bending occurred in the copolymer of 9,9-dioctyl?uorene (50%) and N-(4-(2-butyl)-phenyl)diphenylamine (F8-PFB) layer near the cathode at 0 V bias, while a linear potential distribution formed in the F8-PFB when a bias voltage was applied to the OLED. Direct observation of the built-in potential and that band bending formed in the F8-PFB layer in the operating OLED suggested that charges moved in the F8-PFB layer before electron injection from the cathode.
关键词： polymer-cathode interface,band bending,organic light-emitting diode,electronic structure,hard X-ray photoelectron spectroscopy
更新于2025-09-04 15:30:14
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Efficient and Long-lived Room Temperature Organic Phosphorescence: Theoretical Descriptors for Molecular Designs
摘要： Room-temperature phosphorescence (RTP) with long afterglow from pure organic materials has attracted great attentions for their potential applications in biological imaging, digital encryption and optoelectronic device and so on. Organic materials have been long considered to be non-phosphorescence owing to the weak molecular spin-orbit coupling and highly sensitive to temperature. However, recently, some purely organic compounds can demonstrate highly efficient RTP with long afterglow upon aggregation while others fail. Namely, it remains a challenge to expound the underline mechanisms. In this study, we present the molecular descriptors to character the phosphorescence efficiency and lifetime. For prototypical RTP system consists of carbonyl group and π-conjugated segments, the excited states can be regarded as admixture of n→π* (with portion α) and π→π* (portion β). Starting from phosphorescent process and El-Sayed rule, we deduced that (i) the intersystem crossing (ISC) rate of S1→Tn is mostly governed by the modification of the product of α and β, and (ii) the ISC rate of T1→S0 is determined by the β value of T1. Thus, the descriptors (γ=α×β, β) can be employed to describe the RTP character of organic molecules. From hybrid quantum mechanics and molecular mechanics (QM/MM) calculations, we illustrated the relationships amongst the descriptors (γ, β), phosphorescent efficiency and lifetime, as well as spin-orbit coupling constants. We stressed that the large γ and β values are favorable to the strong and long-lived RTP in organic materials. Experiments have reported confirmations of these molecular design rules.
关键词： Organic materials,Molecular descriptors,Room-temperature phosphorescence,QM/MM calculations,Spin-orbit coupling
更新于2025-09-04 15:30:14