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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ruseckas, Arvydas
University of St Andrews
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2023Chlorine retention enables the indoor light harvesting of triple halide wide bandgap perovskitescitations
- 2020Efficient indoor p-i-n hybrid perovskite solar cells using low temperature solution processed NiO as hole extraction layerscitations
- 2020Low threshold polariton lasing from a solution-processed organic semiconductor in a planar microcavitycitations
- 2019Efficient indoor p-i-n hybrid perovskite solar cells using low temperature solution processed NiO as hole extraction layerscitations
- 2019Low threshold polariton lasing from a solution-processed organic semiconductor in a planar microcavitycitations
- 2019Efficient indoor pin hybrid perovskite solar cells using low temperature solution processed NiO as hole extraction layerscitations
- 2019Improved efficiency of PbS quantum dot sensitized NiO photocathodes with naphthalene diimide electron acceptor bound to the surface of the nanocrystalscitations
- 2019Interface limited hole extraction from methylammonium lead iodide filmscitations
- 2019Interface limited hole extraction from methylammonium lead iodide filmscitations
- 2019Hole delocalization as a driving force for charge pair dissociation in organic photovoltaicscitations
- 2018Improved efficiency of PbS quantum dot sensitized NiO photocathodes with naphthalene diimide electron acceptor bound to the surface of the nanocrystalscitations
- 2017Tuning crystalline ordering by annealing and additives to study its effect on exciton diffusion in a polyalkylthiophene copolymercitations
- 2016Self-trapping and excited state absorption in fluorene homo-polymer and copolymers with benzothiadiazole and tri-phenylaminecitations
- 2015Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modificationcitations
- 2012Nanosecond two-photon absorption and lasing in fluorene-based organic semiconductors
- 2012A Shift from Diffusion Assisted to Energy Transfer Controlled Fluorescence Quenching in Polymer-Fullerene Photovoltaic Blendscitations
- 2009A two-photon pumped polyfluorene lasercitations
- 2009Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer filmscitations
- 2008Thickness Dependence of the Fluorescence Lifetime in Films of Bisfluorene-Cored Dendrimerscitations
- 2008Distance dependence of excitation energy transfer between spacer-separated conjugated polymer filmscitations
Places of action
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article
Effects of thermal annealing on the photophysical properties of bisfluorene-cored dendrimer films
Abstract
Annealing is widely used in the processing of organic semiconductors, and can modify their film morphology and photophysical properties. A study of the effect of annealing on films made from a blue emitting bisfluorene-cored dendrimer is reported. Annealing causes a 15 nm blue-shift in the photoluminescence (PL) spectrum and an 11 nm blue-shift in the amplified spontaneous emission (ASE) spectrum. It causes the PL efficiency to decrease only slightly from 0.92 to 0.83. The radiative decay rate of 1.3 x 10(9) s(-1), the ASE threshold of 1.5 x 10(18) cm(-3) and the singlet-singlet exciton annihilation rate of 5.5 x 10(-10) cm(3) s(-1) are unaffected by annealing. The results indicate a scope for colour adjustment of dendrimer light-emitting diodes and lasers without affecting their efficiencies. Investigation by spectroscopic ellipsometry shows that on annealing, the films become anisotropic, with larger values of the refractive index and extinction coefficient observed for light polarised in the plane of the film than the corresponding out-of-plane values in the absorption region of the bisfluorene core. This anisotropy indicates a preferential in-plane orientation of bisfluorene cores upon annealing. (C) 2009 Elsevier B.V. All rights reserved.