All Outputs (273)

Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters (2017)
Journal Article
Etherington, M. K., Franchello, F., Gibson, J., Northey, T., Santos, J., Ward, J. S., …Monkman, A. P. (2017). Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters. Nature Communications, 8, Article 14987. https://doi.org/10.1038/ncomms14987

Regio- and conformational isomerization are fundamental in chemistry, with profound effects upon physical properties, however their role in excited state properties is less developed. Here two regioisomers of bis(10H-phenothiazin-10-yl)dibenzo[b,d]th... Read More about Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters.

Photophysics of Thermally Activated Delayed Fluorescence Molecules (2017)
Journal Article
Dias, F. B., Penfold, T. J., & Monkman, A. P. (2017). Photophysics of Thermally Activated Delayed Fluorescence Molecules. Methods and Applications in Fluorescence, 5(1), Article 012001. https://doi.org/10.1088/2050-6120/aa537e

Thermally activated delayed fluorescence (TADF) has recently emerged as one of the most attractive methods for harvesting triplet states in metal-free organic materials for application in organic light emitting diodes (OLEDs). A large number of TADF... Read More about Photophysics of Thermally Activated Delayed Fluorescence Molecules.

Thermally activated delayed fluorescent phenothiazine–dibenzo[a,j]phenazine–phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence (2017)
Journal Article
Okazaki, M., Takeda, Y., Data, P., Pander, P., Higginbotham, H., Monkman, A. P., & Minakata, S. (2017). Thermally activated delayed fluorescent phenothiazine–dibenzo[a,j]phenazine–phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence. Chemical Science, 8(4), 2677-2686. https://doi.org/10.1039/c6sc04863c

Novel U-shaped donor–acceptor–donor (D–A–D) π-conjugated multi-functional molecules comprising dibenzo[a,j]phenazine (DBPHZ) as an acceptor and phenothiazines (PTZ) as donors have been developed. Most importantly, the D–A–D compounds exhibit not only... Read More about Thermally activated delayed fluorescent phenothiazine–dibenzo[a,j]phenazine–phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence.

Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence (2016)
Journal Article
Etherington, M. K., Gibson, J., Higginbotham, H. F., Penfold, T. J., & Monkman, A. P. (2016). Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence. Nature Communications, 7, Article 13680. https://doi.org/10.1038/ncomms13680

Knowing the underlying photophysics of thermally activated delayed fluorescence (TADF) allows proper design of high efficiency organic light-emitting diodes. We have proposed a model to describe reverse intersystem crossing (rISC) in donor–acceptor c... Read More about Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence.

Indirect consequences of exciplex states on the phosphorescence lifetime of phenazine-based 1,2,3-triazole luminescent probes (2016)
Journal Article
Costa, B. B. A., Jardim, G. A. M., Santos, P. L., Calado, H. D. R., Monkman, A. P., Dias, F. B., da Silva Júnior, E. N., & Cury, L. (2017). Indirect consequences of exciplex states on the phosphorescence lifetime of phenazine-based 1,2,3-triazole luminescent probes. Physical Chemistry Chemical Physics, 19(5), 3473-3479. https://doi.org/10.1039/c6cp06134f

The optical properties of phenazine derivative probe solutions involving intersystem crossing from singlet to triplet states were investigated by time resolved spectroscopy. The room temperature phosphorescence emission presented different time respo... Read More about Indirect consequences of exciplex states on the phosphorescence lifetime of phenazine-based 1,2,3-triazole luminescent probes.

Sulfonyl-Substituted Heteroleptic Cyclometalated Iridium(III) Complexes as Blue Emitters for Solution-Processable Phosphorescent Organic Light-Emitting Diodes (2016)
Journal Article
Benjamin, H., Zheng, Y., Batsanov, A., Fox, M., Al-Attar, H., Monkman, A., & Bryce, M. (2016). Sulfonyl-Substituted Heteroleptic Cyclometalated Iridium(III) Complexes as Blue Emitters for Solution-Processable Phosphorescent Organic Light-Emitting Diodes. Inorganic Chemistry, 55(17), 8612-8627. https://doi.org/10.1021/acs.inorgchem.6b01179

The synthesis is reported of a series of blue-emitting heteroleptic iridium complexes with phenylpyridine (ppy) ligands substituted with sulfonyl, fluorine, and/or methoxy substituents on the phenyl ring and a picolinate (pic) ancillary ligand. Some... Read More about Sulfonyl-Substituted Heteroleptic Cyclometalated Iridium(III) Complexes as Blue Emitters for Solution-Processable Phosphorescent Organic Light-Emitting Diodes.

Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs (2016)
Journal Article
dos Santos, P. L., Ward, J. S., Bryce, M. R., & Monkman, A. P. (2016). Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs. Journal of Physical Chemistry Letters, 2016(7), 3341-3346. https://doi.org/10.1021/acs.jpclett.6b01542

We show that the emitter and host combination must be optimized to minimize the reverse intersystem crossing (rISC) barrier and maximize thermally activated delayed fluorescence (TADF). The blue TADF emitter, 2,7-bis(9,9-dimethyl-acridin-10-yl)-9,9-d... Read More about Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs.

Pendant Homopolymer and Copolymers as Solution-Processable Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes (2016)
Journal Article
Ren, Z., Nobuyasu, R. S., Dias, F. B., Monkman, A. P., Yan, S., & Bryce, M. R. (2016). Pendant Homopolymer and Copolymers as Solution-Processable Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes. Macromolecules, 49(15), 5452-5460. https://doi.org/10.1021/acs.macromol.6b01216

Materials that display thermally activated delayed fluorescence (TADF) have recently been identified as the third generation emitters for organic light-emitting diodes (OLEDs). However, there are only a few reported examples of polymeric TADF materia... Read More about Pendant Homopolymer and Copolymers as Solution-Processable Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes.

Investigation of the Mechanisms Giving Rise to TADF in Exciplex States (2016)
Journal Article
dos Santos, P. L., Dias, F. B., & Monkman, A. P. (2016). Investigation of the Mechanisms Giving Rise to TADF in Exciplex States. Journal of Physical Chemistry C, 120(32), 18259-18267. https://doi.org/10.1021/acs.jpcc.6b05198

The donor–acceptor systems studied in this work have been demonstrated to show strong exciplex formation by their red-shifted PL emission when compared with the individual donor and acceptor molecules, and all give rise to delayed fluorescence. In al... Read More about Investigation of the Mechanisms Giving Rise to TADF in Exciplex States.

The Importance of Vibronic Coupling for Efficient Reverse Intersystem Crossing in Thermally Activated Delayed Fluorescence Molecules (2016)
Journal Article
Gibson, J., Monkman, A., & Penfold, T. (2016). The Importance of Vibronic Coupling for Efficient Reverse Intersystem Crossing in Thermally Activated Delayed Fluorescence Molecules. ChemPhysChem, 17(19), 2956-2961. https://doi.org/10.1002/cphc.201600662

Factors influencing the rate of reverse intersystem crossing (krISC) in thermally activated delayed fluorescence (TADF) emitters are critical for improving the efficiency and performance of third-generation heavy-metal-free organic light-emitting dio... Read More about The Importance of Vibronic Coupling for Efficient Reverse Intersystem Crossing in Thermally Activated Delayed Fluorescence Molecules.

The Role of Local Triplet Excited States and D-A Relative Orientation in Thermally Activated Delayed Fluorescence: Photophysics and Devices (2016)
Journal Article
Dias, F., Santos, J., Graves, D., Data, P., Nobuyasu, R., Fox, M., …Monkman, A. (2016). The Role of Local Triplet Excited States and D-A Relative Orientation in Thermally Activated Delayed Fluorescence: Photophysics and Devices. Advanced Science, 3(12), Article 1600080. https://doi.org/10.1002/advs.201600080

Here, a comprehensive photophysical investigation of a the emitter molecule DPTZ-DBTO2, showing thermally activated delayed fluorescence (TADF), with near-orthogonal electron donor (D) and acceptor (A) units is reported. It is shown that DPTZ-DBTO2 h... Read More about The Role of Local Triplet Excited States and D-A Relative Orientation in Thermally Activated Delayed Fluorescence: Photophysics and Devices.

Star-Shaped Conjugated Molecules with Oxa- or Thiadiazole Bithiophene Side Arms (2016)
Journal Article
Kotwica, K., Kostyuchenko, A. S., Data, P., Marszalek, T., Skorka, L., Jaroch, T., …Pron, A. (2016). Star-Shaped Conjugated Molecules with Oxa- or Thiadiazole Bithiophene Side Arms. Chemistry - A European Journal, 22(33), 11795-11806. https://doi.org/10.1002/chem.201600984

Star-shaped conjugated molecules, consisting of a benzene central unit symmetrically trisubstituted with either oxa- or thiadiazole bithiophene groups, were synthesized as promising molecules and building blocks for application in (opto)electronics a... Read More about Star-Shaped Conjugated Molecules with Oxa- or Thiadiazole Bithiophene Side Arms.

Electric Field Induce Blue Shift and Intensity Enhancement in 2D Exciplex Organic Light Emitting Diodes; Controlling Electron-Hole Separation (2016)
Journal Article
Al Attar, H. A., & Monkman, A. P. (2016). Electric Field Induce Blue Shift and Intensity Enhancement in 2D Exciplex Organic Light Emitting Diodes; Controlling Electron-Hole Separation. Advanced Materials, 28(36), 8014-8020. https://doi.org/10.1002/adma.201600965

A simple but novel method is designed to study the characteristics of the exciplex state pinned at a donor–acceptor abrupt interface and the effect an external electric field has on these excited states. The reverse Onsager process, where the field i... Read More about Electric Field Induce Blue Shift and Intensity Enhancement in 2D Exciplex Organic Light Emitting Diodes; Controlling Electron-Hole Separation.

Synthesis and characterization of chalcogenophene-based monomers with pyridine acceptor unit. (2016)
Journal Article
Pander, P., Data, P., Turczyn, R., Lapkowski, M., Swist, A., Soloducho, J., & Monkman, A. (2016). Synthesis and characterization of chalcogenophene-based monomers with pyridine acceptor unit. Electrochimica Acta, 210, 773-782. https://doi.org/10.1016/j.electacta.2016.05.185

2,4,6-Trisubstituted pyridine derivatives with different electropolymerizable groups were investigated. It was shown that steric hindrance caused by bichalcogenophene substituents in the 2,6-positions of pyridine enables successful electropolymerizat... Read More about Synthesis and characterization of chalcogenophene-based monomers with pyridine acceptor unit..

Kesterite Inorganic-Organic Heterojunction for Solution Processable Solar Cells (2016)
Journal Article
Data, P., Bialoglowski, M., Lyzwa, K., Bacewicz, R., Dluzewski, P., Lapkowski, M., …Monkman, A. (2016). Kesterite Inorganic-Organic Heterojunction for Solution Processable Solar Cells. Electrochimica Acta, 201, 78-85. https://doi.org/10.1016/j.electacta.2016.03.132

New synthesis of solution processable kesterite and kesterite-phenoxazine nanopowders were presented. The direct band-gap semiconductor Cu2ZnSnS4 has attracted the attention of many due to its large absorption coefficient (alpha > 10(4) cm(-1)) and (... Read More about Kesterite Inorganic-Organic Heterojunction for Solution Processable Solar Cells.

Soluble Flavanthrone Derivatives: Synthesis, Characterization, and Application to Organic Light-Emitting Diodes (2016)
Journal Article
Kotwica, K., Bujak, P., Data, P., Krzywiec, W., Wamil, D., Gunka, P. A., …Monkman, A. (2016). Soluble Flavanthrone Derivatives: Synthesis, Characterization, and Application to Organic Light-Emitting Diodes. Chemistry - A European Journal, 22(23), 7978-7986. https://doi.org/10.1002/chem.201600513

Simple modification of benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridine-8,16-dione, an old and almost-forgotten vat dye, by reduction of its carbonyl groups and subsequent O-alkylation, yields solution-processable, electroactive, conjugated compounds... Read More about Soluble Flavanthrone Derivatives: Synthesis, Characterization, and Application to Organic Light-Emitting Diodes.

Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters (2016)
Journal Article
Data, P., Pander, P., Okazaki, M., Takeda, Y., Minakata, S., & Monkman, A. (2016). Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters. Angewandte Chemie International Edition, 55(19), 5739-5744. https://doi.org/10.1002/anie.201600113

A new family of thermally activated delayed fluorescence (TADF) emitters based on U-shaped D-A-D architecture with a novel accepting unit has been developed. All investigated compounds have small singlet-triplet energy splitting (E-ST) ranging from 0... Read More about Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters.

Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States (2016)
Journal Article
Nobuyasu, R. S., Ren, Z., Griffiths, G. C., Batsanov, A. S., Data, P., Yan, S., …Dias, F. B. (2016). Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States. Advanced Optical Materials, 4(4), 597-607. https://doi.org/10.1002/adom.201500689

The photophysics of thermally activated delayed fluorescence (TADF) in phenothiazine-dibenzothiophene-S,S-dioxide (PTZ-DBTO2) molecule is investigated in detail. First, it is shown that the proximity of local triplet excited states (3LE), e.g., 3D or... Read More about Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States.

Engineering the singlet–triplet energy splitting in a TADF molecule (2016)
Journal Article
Santos, P. L., Ward, J. S., Data, P., Batsanov, A. S., Bryce, M. R., Dias, F. B., & Monkman, A. P. (2016). Engineering the singlet–triplet energy splitting in a TADF molecule. Journal of Materials Chemistry C Materials for optical and electronic devices, 4(17), 3815-3824. https://doi.org/10.1039/c5tc03849a

The key to engineering an efficient TADF emitter is to achieve a small energy splitting between a pair of molecular singlet and triplet states. This work makes important contributions towards achieving this goal. By studying the new TADF emitter 2,7-... Read More about Engineering the singlet–triplet energy splitting in a TADF molecule.

Exciplex Enhancement as a Tool to Increase OLED Device Efficiency (2016)
Journal Article
Data, P., Kurowska, A., Pluczyk, S., Zassowski, P., Pander, P., Jedrysiak, R., …Monkman, A. P. (2016). Exciplex Enhancement as a Tool to Increase OLED Device Efficiency. Journal of Physical Chemistry C, 120(4), 2070-2078. https://doi.org/10.1021/acs.jpcc.5b11263

Organic electronics, mainly due to advancements in OLED (organic light-emitting diode) technology, is a fast developing research area having already revolutionized the displays market. This direction presents the use of exciplex emitters and thermall... Read More about Exciplex Enhancement as a Tool to Increase OLED Device Efficiency.