Outputs (282)

Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence (2022)
Journal Article
Paredis, S., Cardeynaels, T., Deckers, J., Danos, A., Vanderzande, D., Monkman, A. P., Champagne, B., & Maes, W. (2022). Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4775-4784. https://doi.org/10.1039/d1tc04885f

The bridging phenyl group in a fluorescent phenoxazine-benzothiazole donor–acceptor dyad is replaced by either a naphthalene or a thiophene moiety to probe the influence of a more extended conjugated system or the presence of a sulfur-containing hete... Read More about Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence.

Spiro donor–acceptor TADF emitters: naked TADF free from inhomogeneity caused by donor acceptor bridge bond disorder. Fast rISC and invariant photophysics in solid state hosts (2022)
Journal Article
Gomes Franca, L., Danos, A., & Monkman, A. (2022). Spiro donor–acceptor TADF emitters: naked TADF free from inhomogeneity caused by donor acceptor bridge bond disorder. Fast rISC and invariant photophysics in solid state hosts. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(4), 1313-1325. https://doi.org/10.1039/d1tc04484b

We have studied the thermally activated delayed fluorescence (TADF) properties of the spiro-bridged donor–acceptor molecule, 10-phenyl-10H,10′H-spiro[acridine-9,9-anthracen]-10′-one, (ACRSA) in guest–host films and used it as a probe to explore the d... Read More about Spiro donor–acceptor TADF emitters: naked TADF free from inhomogeneity caused by donor acceptor bridge bond disorder. Fast rISC and invariant photophysics in solid state hosts.

Halogenation of a twisted non-polar π-system as a tool to modulate phosphorescence at room temperature (2021)
Journal Article
Farias, G., Salla, C. A., Aydemir, M., Sturm, L., Dechambenoit, P., Durola, F., de Souza, B., Bock, H., Monkman, A. P., & Bechtold, I. H. (2021). Halogenation of a twisted non-polar π-system as a tool to modulate phosphorescence at room temperature. Chemical Science, 12(45), https://doi.org/10.1039/d1sc04936d

Halogenation of a twisted three-fold symmetric hydrocarbon with F, Cl or Br leads to strong modulation of triplet–triplet annihilation and dual phosphorescence, one thermally activated and the other very persistent and visible by eye, with different... Read More about Halogenation of a twisted non-polar π-system as a tool to modulate phosphorescence at room temperature.

Why Do We Still Need a Stable Long Lifetime Deep Blue OLED Emitter? (2021)
Journal Article
Monkman, A. (2022). Why Do We Still Need a Stable Long Lifetime Deep Blue OLED Emitter?. ACS Applied Materials and Interfaces, 14(18), 20463-20467. https://doi.org/10.1021/acsami.1c09189

The need for a high efficiency deep blue organic emitter with narrow emission line width has never been so great. This is driven by the need to simplify the complex OLED stack for displays to enable larger substrate sizes to be used and greatly incre... Read More about Why Do We Still Need a Stable Long Lifetime Deep Blue OLED Emitter?.

Effects of asymmetric acceptor and donor positioning in deep blue pyridyl-sulfonyl based TADF emitters (2021)
Journal Article
Haykir, G., Aydemir, M., Danos, A., Gumus, S., Hizal, G., Monkman, A. P., & Turksoy, F. (2021). Effects of asymmetric acceptor and donor positioning in deep blue pyridyl-sulfonyl based TADF emitters. Dyes and Pigments, 194, Article 109579. https://doi.org/10.1016/j.dyepig.2021.109579

In this work, we report synthesis and photophysical properties of deep-blue emitting donor-acceptor (D-A) and donor-acceptor-donor (D-A-D) thermally activated delayed fluorescence (TADF) molecules, where the molecules designed using carbazole as a do... Read More about Effects of asymmetric acceptor and donor positioning in deep blue pyridyl-sulfonyl based TADF emitters.

Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters (2021)
Journal Article
Miranda-Salinas, H., Hung, Y.-T., Chen, Y.-S., Luo, D., Kao, H.-C., Chang, C.-H., Wong, K.-T., & Monkman, A. (2021). Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(28), https://doi.org/10.1039/d1tc02316k

Donor–donor′–acceptor molecules where the donor′ bridges the donor and acceptor have different possible interaction pathways for charge transfer. Here we study a series of donor–donor′–acceptor molecules, having the same acceptor and donor′ but diffe... Read More about Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters.

Silylethynyl Substitution for Preventing Aggregate Formation in Perylene Diimides (2021)
Journal Article
Aksoy, E., Danos, A., Li, C., Monkman, A. P., & Varlikli, C. (2021). Silylethynyl Substitution for Preventing Aggregate Formation in Perylene Diimides. Journal of Physical Chemistry C, 125(23), 13041-13049. https://doi.org/10.1021/acs.jpcc.1c03131

Ethynylene-bridged perylene diimides (PDIs) with different sized silane groups have been synthesized as a steric blocking group to prevent the formation of non-radiative trap sites, for example, strong H-aggregates and other dimers or excimers. Excit... Read More about Silylethynyl Substitution for Preventing Aggregate Formation in Perylene Diimides.

Vibrational Damping Reveals Vibronic Coupling in Thermally Activated Delayed Fluorescence Materials (2021)
Journal Article
Hempe, M., Kukhta, N. A., Danos, A., Fox, M. A., Batsanov, A. S., Monkman, A. P., & Bryce, M. R. (2021). Vibrational Damping Reveals Vibronic Coupling in Thermally Activated Delayed Fluorescence Materials. Chemistry of Materials, 33(9), 3066-3080. https://doi.org/10.1021/acs.chemmater.0c03783

We investigate a series of D–A molecules consisting of spiro[acridan-9,9′-fluorene] as the donor and 2-phenylenepyrimidine as the acceptor. In two of the materials, a spiro center effectively electronically isolates the D unit from (consequently) opt... Read More about Vibrational Damping Reveals Vibronic Coupling in Thermally Activated Delayed Fluorescence Materials.

Are the Rates of Dexter Transfer in TADF Hyperfluorescence Systems Optically Accessible? (2021)
Journal Article
Haase, N., Danos, A., Pflumm, C., Stachelek, P., Brütting, W., & Monkman, A. P. (2021). Are the Rates of Dexter Transfer in TADF Hyperfluorescence Systems Optically Accessible?. Materials Horizons, 8(6), 1805-1815. https://doi.org/10.1039/d0mh01666g

Seemingly not, but for unexpected reasons. Combining the triplet harvesting properties of TADF materials with the fast emission rates and colour purity of fluorescent emitters is attractive for developing high performance OLEDs. In this “hyperfluores... Read More about Are the Rates of Dexter Transfer in TADF Hyperfluorescence Systems Optically Accessible?.

Difluorodithieno[3,2-a:2′,3′-c]phenazine as a strong acceptor for materials displaying thermally activated delayed fluorescence or room temperature phosphorescence (2021)
Journal Article
Cardeynaels, T., Paredis, S., Danos, A., Harrison, A., Deckers, J., Brebels, S., Lutsen, L., Vanderzande, D., Monkman, A. P., Champagne, B., & Maes, W. (2021). Difluorodithieno[3,2-a:2′,3′-c]phenazine as a strong acceptor for materials displaying thermally activated delayed fluorescence or room temperature phosphorescence. Dyes and Pigments, 190, https://doi.org/10.1016/j.dyepig.2021.109301

A novel strong electron-acceptor unit, 9,10-difluorodithieno[3,2-a:2′,3′-c]phenazine (DTPz), is synthesized and applied in the design of two donor-acceptor type emitters displaying long-lived delayed emission. Using either 9,9-dimethyl-9,10-dihydroac... Read More about Difluorodithieno[3,2-a:2′,3′-c]phenazine as a strong acceptor for materials displaying thermally activated delayed fluorescence or room temperature phosphorescence.