A5011662524- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- 2D Materials and Applications
- Solid State Laser Technologies
- ZnO doping and properties
- Plasmonic and Surface Plasmon Research
- Experimental and Theoretical Physics Studies
- Thermal Expansion and Ionic Conductivity
- Luminescence Properties of Advanced Materials
- Ga2O3 and related materials
- Conducting polymers and applications
- Antenna Design and Optimization
- Photonic and Optical Devices
- Music Technology and Sound Studies
- Antenna Design and Analysis
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Studies
- Sports Dynamics and Biomechanics
- Graphene research and applications
- Transition Metal Oxide Nanomaterials
- Advanced Antenna and Metasurface Technologies
- Synthesis and Properties of Aromatic Compounds
- Chalcogenide Semiconductor Thin Films
University of Cambridge
2021-2025
Institute of Materials Research and Engineering
2021-2024
Agency for Science, Technology and Research
2021-2024
Abstract All‐polymer solar cells (All‐PSCs) are considered to be the most promising candidates for realizing efficient and stable organic (OSCs). However, challenge of controlling morphology has hindered performance All‐PSCs. Compared small molecule acceptors, polymer acceptors play a more crucial role in obtaining an ideal The molecular weight is one key factors determining morphological mechanical properties as well interactions with donors. Herein, by using monomer PYIT (PYIT1) PYITs low...
Solid-state infrared-to-visible photon up-conversion is important for spectral-tailoring applications. However, existing systems not only suffer from low efficiencies and a need high excitation intensity, but also exhibit limited selection of materials complex fabrication processes. Herein, we propose sensitizer with bulk-heterojunction structure, comprising both an energy donor acceptor, triplet-triplet annihilation devices. The occurs through charge separation at the donor-acceptor...
Open-shell systems with extensive π-conjugation have fascinating properties due to their narrow bandgaps and spin interactions. In this work, we report neutral open-shell di- polyradical conjugated materials exhibiting intriguing optical magnetic properties. Our key design advance is the planarized geometry allowing for greater interaction between adjacent spins. This results in absorption emission near infrared at 803 1050 nanometers, respectively, demonstrate a unique electronic structure...
Current organic light-emitting diode (OLED) technology uses molecules in a molecular host. We report green circularly polarized luminescence (CPL) chirally ordered supramolecular assembly, with 24% dissymmetry triazatruxene (TAT) system. found that TAT assembled into helices pitch of six molecules, associating angular momentum to the valence and conduction bands obtaining observed CPL. Cosublimation as “guest” structurally mismatched “host” enabled fabrication thin films which chiral...
We advocate triplet–triplet annihilation upconverters as candidates for blue FuLEDs (OLEDs enhanced by triplet-fusion), demonstrating here with the sky-blue DPBF. Its TTA or triplet-fusion behaviour is explored in both solutions and FuLED devices.
Photon upconversion via triplet–triplet annihilation (TTA-UC) provides a pathway to overcoming the thermodynamic efficiency limits in single-junction solar cells by allowing harvesting of sub-bandgap photons. Here, we use mixed halide perovskite nanocrystals (CsPbX3, X = Br/I) as triplet sensitizers, with excitation transfer 9,10-diphenylanthracene (DPA) and/or 9,10-bis[(triisopropylsilyl)ethynyl]anthracene (TIPS-An) which act annihilators. We observe that is five times higher combination...
Melt alloying, the process of melting a physical powder blend to create homogeneous alloy, is widely used in materials processing. By carefully selecting and their proportions, properties resulting alloy can be precisely controlled. In this study, we investigate possibility utilizing melt alloying principles for meltable two-dimensional hybrid organic–inorganic perovskites (2D-HOIPs). We mixtures two selected 2D-HOIPs: glass-forming (S-NEA)2PbBr4 (S-NEA = (S)-(−)-1-(1-naphthyl)ethylammonium)...
Recent reports highlight the potential of tin-based perovskite semiconductors for high-performance p-type field-effect transistors (FETs) with mobilities exceeding 20 cm2V-1s-1. However, these high mobilities--often obtained via two-probe (2P) methods on devices small channel length-to-width ratios (L/W < 0.5) operating in saturation regime at drain-source currents--raise concerns about overestimation due to contact resistance and non-ideal FET characteristics. Here, we performed gated...
Abstract The International Young Physicists’ Tournament (IYPT) is a worldwide, annual competition for high school students. This paper adapted from the author’s investigation into problem 4, Ball Sound , of 27th IYPT. A novel set-up proposed to investigate unusual ‘chirping’ sound produced when two hard steel balls, or similar, are brought gently contact with each other. It shown that decreasing time interval between rapid successive ball collisions, and not surface acceleration, responsible...
The efficiency of OLEDs is fundamentally determined by the spin excited state electrons. We have previously shown, using a new class emissive molecules, carbene-metal-amides (CMA), an unusual emission pathway based on spin-state inter-conversion - intramolecular rotation induces shift in relative energies first singlet and triplet states, leading to extremely efficient singlet-triplet interconversion photoemission. In our recent work, we report solution-processed dual-dopant polymer LEDs,...