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Dr Fernando Dias' Outputs (122)

Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons? (2013)
Journal Article
Jankus, V., Chiang, C., Dias, F., & Monkman, A. P. (2013). Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons?. Advanced Materials, 25(10), 1455-1459. https://doi.org/10.1002/adma.201203615

Simple trilayer, deep blue, fluorescent exciplex organic light-emitting diodes (OLEDs) are reported. These OLEDs emit from an exciplex state formed between the highest occupied molecular orbital (HOMO) of N,N′-bis(1-naphthyl)N,N′-diphenyl-1,1′-biphen... Read More about Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons?.

Measurement of interchain and intrachain exciton hopping barriers in luminescent polymer (2011)
Journal Article
Santos, P., Costa, B., Araujo, K., Cury, L., Snedden, E., Bourdakos, K., …Monkman, A. (2011). Measurement of interchain and intrachain exciton hopping barriers in luminescent polymer. Journal of Physics: Condensed Matter, 24(1), https://doi.org/10.1088/0953-8984/24/1/015801

The integrated photoluminescence intensity in thin films of 'Super Yellow' copolymer has been analyzed using a Mott-like temperature dependence. This has enabled us to observe contributions from two emission channels, indicative of exciton recombinat... Read More about Measurement of interchain and intrachain exciton hopping barriers in luminescent polymer.

Bipolar Molecules with High Triplet Energies: Synthesis, Photophysical, and Structural Properties. (2011)
Journal Article
Zheng, Y., Batsanov, A., Jankus, V., Dias, F., Bryce, M., & Monkman, A. (2011). Bipolar Molecules with High Triplet Energies: Synthesis, Photophysical, and Structural Properties. Journal of Organic Chemistry, 76(20), 8300-8310. https://doi.org/10.1021/jo201488v

This article sheds new light on the interplay of electronic and conformational effects in luminescent bipolar molecules. A series of carbazole/1,3,4-oxadiazole hybrid molecules is described in which the optoelectronic properties are systematically va... Read More about Bipolar Molecules with High Triplet Energies: Synthesis, Photophysical, and Structural Properties..

The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes (2011)
Journal Article
King, S., Cass, M., Pintani, M., Coward, C., Dias, F., Monkman, A., & Roberts, M. (2011). The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes. Journal of Applied Physics, 109(7), Article 074502. https://doi.org/10.1063/1.3561430

We demonstrate that the fast initial decay of a prototypical fluorescent polymer based organic light emitting diode device is related to the contribution that triplet-triplet annihilation makes to the device efficiency. We show that, during typical o... Read More about The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes.

Long range energy transfer in conjugated polymer sequential bilayers (2011)
Journal Article
Cury, L., Bourdakos, K., Dai, D., Dias, F., & Monkman, A. (2011). Long range energy transfer in conjugated polymer sequential bilayers. The Journal of Chemical Physics, 134(10), Article 104903. https://doi.org/10.1063/1.3560164

Steady-state and time-resolved photoluminescence have been used to investigate the optical properties of bilayer and blend films made from poly(9,9-dioctyl-fluorene-2,7-diyl) (PFO) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH PP... Read More about Long range energy transfer in conjugated polymer sequential bilayers.

Synthesis, Excited State Dynamics, and Optical Characteristics of Oligophenyl-Based Swivel Cruciforms in Solution and Solid State. (2010)
Journal Article
Palsson, L., Nehls, B., Galbrecht, F., Coombs, B., Dias, F., Farrell, T., …Monkman, A. (2010). Synthesis, Excited State Dynamics, and Optical Characteristics of Oligophenyl-Based Swivel Cruciforms in Solution and Solid State. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 114(40), 12765-12776. https://doi.org/10.1021/jp1028883

Tuning the Intramolecular Charge Transfer Emission from Deep Blue to Green in Ambipolar Systems Based On Dibenzothiophene S S-Dioxide by Manipulation of Conjugation and Strength of the Electron Donor Units (2010)
Journal Article
Moss, K., Bourdakos, K., Bhalla, V., Kamtekar, K., Bryce, M., Fox, M., …Monkman, A. (2010). Tuning the Intramolecular Charge Transfer Emission from Deep Blue to Green in Ambipolar Systems Based On Dibenzothiophene S S-Dioxide by Manipulation of Conjugation and Strength of the Electron Donor Units. Journal of Organic Chemistry, 75(20), 6771-6781. https://doi.org/10.1021/jo100898a

The efficient synthesis and photophysical properties of a series of ambipolar donor−acceptor−donor systems is described where the acceptor is dibenzothiophene S,S-dioxide and the donor is fluorene, carbazole, or arylamine. The systems exhibit intramo... Read More about Tuning the Intramolecular Charge Transfer Emission from Deep Blue to Green in Ambipolar Systems Based On Dibenzothiophene S S-Dioxide by Manipulation of Conjugation and Strength of the Electron Donor Units.

Exploiting a Dual-Fluorescence Process in Fluorene-Dibenzothiophene-S,S-dioxide Co-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission. (2009)
Journal Article
King, S., Perepichka, I., Perepichka, I., Dias, F., Bryce, M., & Monkman, A. (2009). Exploiting a Dual-Fluorescence Process in Fluorene-Dibenzothiophene-S,S-dioxide Co-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission. Advanced Functional Materials, 19(4), 586-591. https://doi.org/10.1002/adfm.200801237

A description of the synthesis of random (9,9-dioctylfluorene-2,7-diyl)-dibenzothiophene-S,S-dioxide-3,7-diyl) co-polymers (p(F-S)x) by palladium- catalyzed Suzuki cross-coupling polymerization where the feed ration of the latter is varied from 2 to... Read More about Exploiting a Dual-Fluorescence Process in Fluorene-Dibenzothiophene-S,S-dioxide Co-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission..

Exciton Diffusion in Polyfluorene Copolymer Thin Films: Kinetics, Energy Disorder and Thermally Assisted Hopping (2009)
Journal Article
Dias, F., Kamtekar, K., Cazati, T., Williams, G., Bryce, M., & Monkman, A. (2009). Exciton Diffusion in Polyfluorene Copolymer Thin Films: Kinetics, Energy Disorder and Thermally Assisted Hopping. ChemPhysChem, 10(12), 2096-2104. https://doi.org/10.1002/cphc.200900112

A series of {(9,9-dioctylfluorene)(0.7-x)-(dibenzothiophene-S,S-dioxide)(0.3)-[4,7-b is(2-thienyl)-2,1,3-benzothiadiazole](x)} (PFS30-TBTx), where x represents the minor percentage of the red emitter 4,7-bis(2-thienyl)-2,1,3-benzothiadiazole (TBT) ra... Read More about Exciton Diffusion in Polyfluorene Copolymer Thin Films: Kinetics, Energy Disorder and Thermally Assisted Hopping.

Singlet Excitation Energy Harvesting and Triplet Emission in the Self-Assembled System Poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} copolymer/tris(bipyridyl)ruthenium(II) in Aqueous Solution (2009)
Journal Article
Burrows, H., Fonseca, S., Dias, F., de Melo, J., Monkman, A., Scherf, U., & Pradhan, S. (2009). Singlet Excitation Energy Harvesting and Triplet Emission in the Self-Assembled System Poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} copolymer/tris(bipyridyl)ruthenium(II) in Aqueous Solution. Advanced Materials, 21(10-11), 1155-1159. https://doi.org/10.1002/adma.200801713

Singlet-singlet energy transfer in self-assembled systems of the cationic poly{9,9-bis[6-N,N,N-trimethylammonium)hexyl]fluorene-co-1,4-phenylene} with oppositely charged porphyrins. (2009)
Journal Article
Pinto, S. M., Burrows, H. D., Pereira, M. M., Fonseca, S. M., Dias, F. B., Mallavia, R., & Tapia, M. J. (2009). Singlet-singlet energy transfer in self-assembled systems of the cationic poly{9,9-bis[6-N,N,N-trimethylammonium)hexyl]fluorene-co-1,4-phenylene} with oppositely charged porphyrins. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 113(50), 16093-100. https://doi.org/10.1021/jp904959h

Energy Transfer in Nanostructured Films Containing Poly(p-phenylene vinylene) and Acceptor Species (2009)
Journal Article
Postacchini, B., Zucolotto, V., Dias, F., Monkman, A., & Oliveira Jr, O. (2009). Energy Transfer in Nanostructured Films Containing Poly(p-phenylene vinylene) and Acceptor Species. Journal of Physical Chemistry C, 113(23), 10303-10306. https://doi.org/10.1021/jp9000785

The combination of luminescent polymers and suitable energy-accepting materials may lead to a molecular-level control of luminescence in nanostructured films. In this study, the properties of layer-by-layer (LbL) films of poly(p-phenylene vinylene) (... Read More about Energy Transfer in Nanostructured Films Containing Poly(p-phenylene vinylene) and Acceptor Species.

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..