A5021071080- Terahertz technology and applications
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Photochemistry and Electron Transfer Studies
- Perovskite Materials and Applications
- Advanced X-ray Imaging Techniques
- Superconducting and THz Device Technology
- Pulsed Power Technology Applications
- Advanced Fiber Laser Technologies
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Thermography and Photoacoustic Techniques
- Radiation Detection and Scintillator Technologies
- Electrochemical Analysis and Applications
- Image Processing Techniques and Applications
- Energetic Materials and Combustion
- Photocathodes and Microchannel Plates
- Advanced Optical Sensing Technologies
Daresbury Laboratory
2014-2024
Cockcroft Institute
2013-2024
Science and Technology Facilities Council
2014-2023
Sci-Tech Daresbury
2014-2023
Technology Centre Prague
2020
Durham University
2009-2014
Abstract One of the key issues concerning development efficient polymer solar cell technology is lack viable materials which absorb in near‐infrared (NIR) region. This could be resolved by up‐converting energy from NIR into visible using triplet fusion (TF) with an additional layer that fabricated separately and deposited on top. Theoretically a maximum upconversion (UC) via TF efficiency 50% obtained. Here, it demonstrated film commercially available poly(para‐phenylene vinylene) copolymer...
In this paper, we investigate excited state dynamics in amorphous rubrene vacuum sublimed films. We report the direct observation of singlet fission have determined rate to be >2.5\ifmmode\times\else\texttimes\fi{}10${}^{12}$ s${}^{\ensuremath{-}1}$. Simultaneously, observe strong polaron pair absorption and propose that formation could competing with fission. Another possible conclusion from our experiments two triplets might arise via pairs. either case, pairs play an important role film....
This report describes the conceptual design of a proposed free electron laser test facility called CLARA that will be major upgrade to existing VELA accelerator at Daresbury Laboratory in UK. able number new schemes have been but require proof principle experiment confirm they perform as predicted. The primary focus on ultra short photon pulse generation which take lasers into whole regime, enabling area science emerge.
The sub-luminal phase velocity of electromagnetic waves in free space is generally unobtainable, being closely linked to forbidden faster than light group velocities. requirement effective phase-velocity laser-driven particle acceleration schemes imposes a fundamental limit on the total achievable free-space, and necessitates use dielectric structures waveguides for extending field-particle interaction. Here we demonstrate new travelling-source propagation approach overcoming limits....
The compact linear accelerator for research and applications (CLARA) is an ultrabright electron beam test facility being developed at STFC Daresbury Laboratory. ultimate aim of CLARA to advanced free laser (FEL) schemes that can later be implemented on existing future short-wavelength FELs. In addition, a unique provide high-quality novel concepts ideas in wide range disciplines function as technology demonstrator United Kingdom x-ray FEL facility. built three phases; the first phase, or...
The recombination and dissociation of geminate polaron pairs (GPPs) in bulk-heterojunction blends the dye molecule 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine (PC) with electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is studied using femtosecond transient absorption spectroscopy. kinetics GPP state dominated by efficient to triplet PC, which competes acts fundamentally reduce total number free polarons generated blend. Both are strongly dependent on blend...
The compact linear accelerator for research and applications (CLARA) is a 250 MeV ultrabright electron beam test facility at STFC Daresbury Laboratory. A user beamline has been designed to maximize the exploitation of CLARA in variety fields, including novel acceleration new modalities radiotherapy. In this paper, we present specification design full energy exploitation. We outline key elements that will provide users access ultrashort, low emittance bunches two large experiment chambers....
An anionic fluorene-phenylene poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl}-based copolymer containing on-chain perylenediimine (PDI) chromophoric units, PBS-PFP-PDI, was synthesized and its photophysical properties studied as aggregates isolated chains in water dioxane/water (1:1) solution. UV–vis emission spectroscopy measurements, time-correlated single photon counting, wide field imaging have been employed to investigate the excited-state behavior of...
Photoinduced charge generation is studied in a model donor/acceptor blended system, consisting of bulk-heterojunction blends the conjugated polymer regioregular poly(3-hexylthiophene) (P3HT) and dye molecule phthalocyanine (PC). Excitation at 780 nm, into PC NIR absorption band, creates excitons domains without populating P3HT excited state. The kinetics geminate polaron pairs (GPP) free polarons can then be followed interference from signatures directly created polarons, energy transfer, or...
The time-resolved detection of ultrashort pulsed THz-band electric field temporal profiles without an laser probe is demonstrated. A non-linear interaction between a narrow-bandwidth optical and the THz pulse transposes spectral intensity phase information to region, thereby generating whose envelope replicates profile real field. This characterised via autocorrelation based FROG (frequency resolved gating) measurement, hence revealing profile. combination narrow-bandwidth, long duration,...
A general description of electro-optic detection including non-collinear phase matching and finite transverse beam profiles is presented. It shown theoretically experimentally that in ZnTe (and similar materials) produces an angular chirp the χ(2)-generated optical signal. Due to this, THz probe arrangements such as single-shot measurements or through accidental misalignment, measurement undistorted signal critically dependent on having sufficient acceptance path. The associated spatial...
Three diaminodicyanoquinodimethanes, 4-(R(1)R(2)C)-1-[(NC)2C]-C6H4 (R(1),R(2) = H2N, 1; R(1) 3,5-Me2-4-OCH4H6N-, R(2) 2; 4-Me-C5H9N, 3), were investigated using carbon-13 NMR, steady-state, and ultrafast transient absorption fluorescence spectroscopies to unravel the unusual characteristics of this class chromophores. Computed (GIAO)B3LYP/6-31G* data for zwitterions 1-3 necessary solvation (PCM) models shown be in excellent agreement with observed structural NMR data. The ground-state...
We demonstrate that full temporal characterisation of few-cycle electromagnetic pulses, including retrieval the carrier envelope phase (CEP), can be directly obtained from Frequency Resolved Optical Gating (FROG) techniques in which interference between non-linear frequency mixing processes is resolved. derive a framework for this scheme, defined Real Domain FROG (ReD-FROG), cases sum and difference components fundamental / components. A successful numerical demonstration ReD-FROG as applied...
Geminate polaron-pair recombination directly to the triplet state of small dye molecule copper(II) 1,4,8,11,15,18,22,25-octabutoxy-29H,31H- phthalocyanine (CuPC) and exciton trapping in CuPC domains, combine reduce internal quantum efficiency free polaron formation bulk-heterojunction blends doped with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as electron acceptor. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials are...
The integrated photoluminescence intensity in thin films of 'Super Yellow' copolymer has been analyzed using a Mott-like temperature dependence. This enabled us to observe contributions from two emission channels, indicative exciton recombination proceeding distinct origins. At high temperature, interchain thermally activated energy transfer and migration dominates, resulting large scale quenching the hence quantum yield. However, at relatively low an additional increase occurs. new channel...
The Versatile Electron Linear Accelerator (VELA) facility will provide enabling infrastructures targeted at the development and testing of novel compact accelerator technologies, specifically through partnership with industry aimed addressing applications in medicine, health, security, energy industrial processing. has now been commissioned Daresbury Laboratory is being actively utilised by groups who are able to take advantage variable electron beam parameters available on VELA either...
A user facility VELA (Versatile Electron Linear Accelerator) based on an RF photoinjector has been commissioned at Daresbury Laboratory in April 2013, providing beam to first users September 2013. Machine study runs 2013-2014 have concentrated characterisation of main parameters like bunch charge, its momentum, emittance and dependence these the launching phase. Major efforts also investigation dark current from gun amplitude. Significant time dedicated relative stability LLRF drive laser...
Copyright © 2016 CC-BY-3.0 and by the respective authors. An overview is presented of developments on VELA (Versatile Electron Linear Accelerator), an RF photoinjector with two user stations (beam areas BA1, BA2) at Daresbury Laboratory. Numerous machine development, commissioning, beam characterisation experiments have been completed in past year. A new beamline a dedicated multi-purpose chamber commissioned BA1 first performed. number measures taken to improve stability mitigating problems...