Skip to main content

Research Repository

Advanced Search

Dr Fernando Dias' Outputs (125)

The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes. (2009)
Journal Article
Bright, D., Dias, F., Galbrecht, F., Scherf, U., & Monkman, A. (2009). The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes. Advanced Functional Materials, 19(1), 67-73. https://doi.org/10.1002/adfm.200800313

Di-n-alkyl substituted polyfluorenes with alkyl chain lengths of 6, 7, 8, 9, and 10 carbon atoms (PF6, PF7, PF8, PF9, and PF10) are studied in dilute solution in MCH using optical spectroscopy. Beta-phase is formed upon cooling in solutions (∼ 7 µg m... Read More about The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes..

Enhanced triplet formation by twisted intramolecular charge-transfer excited states in conjugated oligomers and polymers. (2008)
Journal Article
King, S., Matheson, R., Dias, F., & Monkman, A. (2008). Enhanced triplet formation by twisted intramolecular charge-transfer excited states in conjugated oligomers and polymers. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 112(27), 8010-8016. https://doi.org/10.1021/jp712163b

The triplet yield and intersystem crossing rate of a set of conjugated oligomers and polymers that, in polar solvents, form a charge-transfer state with a twisted conformation has been investigated. It was observed that in these dibenzothiophene-fluo... Read More about Enhanced triplet formation by twisted intramolecular charge-transfer excited states in conjugated oligomers and polymers..

Dipolar stabilization of emissive singlet charge transfer excited states in polyfluorene copolymers (2008)
Journal Article
Dias, F., King, S., Monkman, A., Perepichka, I., Kryuchkov, M., Perepichka, I., & Bryce, M. (2008). Dipolar stabilization of emissive singlet charge transfer excited states in polyfluorene copolymers. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 112(21), 6557-6566. https://doi.org/10.1021/jp800068d

The singlet excited-state dynamics in poly[(9,9-dioctylfluorene)−(dibenzothiophene-S,S-dioxide)] (PFSx) random copolymers with different contents of dibenzothiophene-S,S-dioxide (S) units have been studied by steady-state and time resolved fluorescen... Read More about Dipolar stabilization of emissive singlet charge transfer excited states in polyfluorene copolymers.

Influence of solvent quality on the self-organization of archetypical hairy rods - Branched and linear side chain polyfluorenes: Rodlike chains versus "beta-sheets" in solution (2006)
Journal Article
Knaapila, M., Garamus, V., Dias, F., Almasy, L., Galbrecht, F., Charas, A., …Monkman, A. (2006). Influence of solvent quality on the self-organization of archetypical hairy rods - Branched and linear side chain polyfluorenes: Rodlike chains versus "beta-sheets" in solution. Macromolecules, 39(19), 6505-6512. https://doi.org/10.1021/ma060886c

Dynamics of conformational relaxation in photoexcited oligofluorenes and polyfluorene (2006)
Journal Article
Hintschich, S., Dias, F., & Monkman, A. (2006). Dynamics of conformational relaxation in photoexcited oligofluorenes and polyfluorene. Physical review B, 74(4), https://doi.org/10.1103/physrevb.74.045210

In order to disentangle the relaxation effects of exciton migration and conformational rearrangement, a comparative study of a polyfluorene derivative and short oligofluorenes is carried out. We probe their long-time time-dependent relaxation in dilu... Read More about Dynamics of conformational relaxation in photoexcited oligofluorenes and polyfluorene.

Intramolecular charge transfer assisted by conformational changes in the excited state of fluorene-dibenzothiophene-S,S-dioxide co-oligomers (2006)
Journal Article
Dias, F., Pollock, S., Hedley, G., Palsson, L., Monkman, A., Perepichka, I., …Bryce, M. (2006). Intramolecular charge transfer assisted by conformational changes in the excited state of fluorene-dibenzothiophene-S,S-dioxide co-oligomers. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 110(39), 19329-19339. https://doi.org/10.1021/jp0643653

The strong solvatochromism observed for two fluorene-dibenzothiophene-S,S-dioxide oligomers in polar solvents has been investigated using steady-state and time-resolved fluorescence techniques. A low-energy absorption band, attributed to a charge-tra... Read More about Intramolecular charge transfer assisted by conformational changes in the excited state of fluorene-dibenzothiophene-S,S-dioxide co-oligomers.

Direct observation of protein folding in nanoenvironments using a molecular ruler (2006)
Journal Article
Sarkar, R., Shaw, A., Narayanan, S., Dias, F., Monkman, A., & Pal, S. (2006). Direct observation of protein folding in nanoenvironments using a molecular ruler. Biophysical Chemistry, 123(1), 40-48. https://doi.org/10.1016/j.bpc.2006.04.006

We observe folding of horse heart cytochrome c in various environments including nano-compartments (micelles and reverse micelles). Using picosecond-resolved Förster resonance energy transfer (FRET) dynamics of an extrinsic covalently attached probe... Read More about Direct observation of protein folding in nanoenvironments using a molecular ruler.

Fast and slow time regimes of fluorescence quenching in conjugated polyfluorene-fluorenone random copolymers: The role of exciton hopping and dexter transfer along the polymer backbone (2006)
Journal Article
Dias, F., Knaapila, M., Monkman, A., & Burrows, H. (2006). Fast and slow time regimes of fluorescence quenching in conjugated polyfluorene-fluorenone random copolymers: The role of exciton hopping and dexter transfer along the polymer backbone. Macromolecules, 39(4), 1598-1606

The luminescence decay kinetics of polyfluorene copolymers containing fluorenone units randomly distributed along the polymer chain have been Studied by steady-state and time-resolved fluorescence techniques in toluene solution. The typical green emi... Read More about Fast and slow time regimes of fluorescence quenching in conjugated polyfluorene-fluorenone random copolymers: The role of exciton hopping and dexter transfer along the polymer backbone.

Bridged diiridium complexes for electrophosphorescent OLEDs : synthesis, X-ray crystal structures, photophysics, and devices. (2006)
Journal Article
Bettington, S., Tavasli, M., Bryce, M., Batsanov, A., Thompson, A., Al Attar, H., …Monkman, A. (2006). Bridged diiridium complexes for electrophosphorescent OLEDs : synthesis, X-ray crystal structures, photophysics, and devices. Journal of materials chemistry, 16(11), 1046-1052. https://doi.org/10.1039/b515258e

Results are presented which challenge the accepted view that dinuclear transition metal–ligand complexes are unsuitable for organic light-emitting device (OLED) applications due to their low luminescence quantum efficiencies. We establish for the fir... Read More about Bridged diiridium complexes for electrophosphorescent OLEDs : synthesis, X-ray crystal structures, photophysics, and devices..

Oligo(fluorenyl) pyridine ligands and their tris-cyclometalated iridium(III) complexes: synthesis, photophysical properties and electrophosphorescent devices (2005)
Journal Article
Tavasli, M., Bettington, S., Bryce, M., Al Attar, H., Dias, F., King, S., & Monkman, A. (2005). Oligo(fluorenyl) pyridine ligands and their tris-cyclometalated iridium(III) complexes: synthesis, photophysical properties and electrophosphorescent devices. Journal of materials chemistry, 15(46), 4963-4970

The new extended tri- and penta-fluorenylpyridine ligands Fl(3)Py 2 and Fl(5)Py 3 and their tris-cyclometalated iridium(III) complexes Ir[Fl(3)Py](3) 5 and Ir[Fl(5)Py](3) 6 have been synthesised and their properties compared with the known iridium( I... Read More about Oligo(fluorenyl) pyridine ligands and their tris-cyclometalated iridium(III) complexes: synthesis, photophysical properties and electrophosphorescent devices.

An investigation into the excitation migration in polyfluorene solutions via temperature dependent fluorescence anisotropy. (2005)
Journal Article
Vaughan, H., Dias, F., & Monkman, A. (2005). An investigation into the excitation migration in polyfluorene solutions via temperature dependent fluorescence anisotropy. The Journal of Chemical Physics, 122(1), Article 014902. https://doi.org/10.1063/1.1829035

Fluorescenceanisotropy of dilute polyfluorene polymer solutions has been used to show that two processes, exciton migration and conformational relaxation (twisting of part of the chain), occur within polyfluorene polymers of 20 or more repeat units.... Read More about An investigation into the excitation migration in polyfluorene solutions via temperature dependent fluorescence anisotropy..