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.

Acridone-amine D-A-D thermally activated delayed fluorescence emitters with narrow resolved electroluminescence and their electrochromic properties (2021)
Journal Article
Vasylieva, M., Pander, P., Sharma, B. K., Shaikh, A. M., Kamble, R. M., Dias, F. B., …Data, P. (2021). Acridone-amine D-A-D thermally activated delayed fluorescence emitters with narrow resolved electroluminescence and their electrochromic properties. Electrochimica Acta, 384, Article 138487. https://doi.org/10.1016/j.electacta.2021.138347

Acridones have found their role in luminescent materials for OLEDs. Most interestingly, showing potential as weak charge transfer thermally activated delayed fluorescence (TADF) emitters, providing narrow photoluminescence. In this work, we present a... Read More about Acridone-amine D-A-D thermally activated delayed fluorescence emitters with narrow resolved electroluminescence and their electrochromic properties.

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?.

Magnifying Grains of Sand, Seeds, and Blades of Grass: Optical Effects in Robert Grosseteste’s De iride (On the Rainbow) (circa 1228–1230) (2021)
Journal Article
White, R. C., Gasper, G. E., McLeish, T. C., Tanner, B. K., Harvey, J. S., Sønnesyn, S. O., …Smithson, H. E. (2021). Magnifying Grains of Sand, Seeds, and Blades of Grass: Optical Effects in Robert Grosseteste’s De iride (On the Rainbow) (circa 1228–1230). Isis: A Journal of the History of Science Society, 112(1), 93-107. https://doi.org/10.1086/713724

In his treatise On the Rainbow (De iride), composed nearly four hundred years before the first known telescope, the English polymath Robert Grosseteste identified three striking optical effects: distant objects can be rendered close by; close-by larg... Read More about Magnifying Grains of Sand, Seeds, and Blades of Grass: Optical Effects in Robert Grosseteste’s De iride (On the Rainbow) (circa 1228–1230).

X-ray imaging of silicon die within fully packaged semiconductor devices (2021)
Journal Article
Tanner, B. K., McNally, P. J., & Danilewsky, A. N. (2021). X-ray imaging of silicon die within fully packaged semiconductor devices. Powder Diffraction, 36(2), 78-84. https://doi.org/10.1017/s088571562100021x

X-ray diffraction imaging (XRDI) (topography) measurements of silicon die warpage within fully packaged commercial quad-flat no-lead devices are described. Using synchrotron radiation, it has been shown that the tilt of the lattice planes in the Anal... Read More about X-ray imaging of silicon die within fully packaged semiconductor devices.

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., …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.

Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence (2021)
Journal Article
Pander, P. H., Daniels, R., Zaytsev, A., Horn, A., Sil, A., Penfold, T., …Dias, F. B. (2021). Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence. Chemical Science, 6172-6180. https://doi.org/10.1039/d1sc00160d

A novel dinuclear platinum(II) complex featuring a ditopic, bis-tetradentate ligand has been prepared. The ligand offers each metal ion a planar O^N^C^N coordination environment, with the two metal ions bound to the nitrogen atoms of a bridging pyrim... Read More about Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence.

Investigation of Intramolecular Through-Space Charge-Transfer States in Donor–Acceptor Charge-Transfer Systems (2021)
Journal Article
Kumar, S., Gomes Franca, L., Stavrou, K., Crovini, E., Cordes, D. B., Slawin, A. M., …Zysman-Colman, E. (2021). Investigation of Intramolecular Through-Space Charge-Transfer States in Donor–Acceptor Charge-Transfer Systems. Journal of Physical Chemistry Letters, 12(11), https://doi.org/10.1021/acs.jpclett.1c00265

Commonly, thermally activated delayed fluorescence (TADF) emitters present a twisted donor–acceptor structure. Here, electronic communication is mediated through-bond via π-conjugation between donor and acceptor groups. A second class of TADF emitter... Read More about Investigation of Intramolecular Through-Space Charge-Transfer States in Donor–Acceptor Charge-Transfer Systems.

Conformational Dependence of Triplet Energies in Rotationally Hindered N‐ and S‐Heterocyclic Dimers: New Design and Measurement Rules for High Triplet Energy OLED Host Materials (2021)
Journal Article
Wright, I. A., Danos, A., Montanaro, S., Batsanov, A. S., Monkman, A. P., & Bryce, M. R. (2021). Conformational Dependence of Triplet Energies in Rotationally Hindered N‐ and S‐Heterocyclic Dimers: New Design and Measurement Rules for High Triplet Energy OLED Host Materials. Chemistry - A European Journal, 27(21), 6545-6556. https://doi.org/10.1002/chem.202100036

A series of four heterocyclic dimers has been synthesized, with twisted geometries imposed across the central linking bond by ortho‐alkoxy chains. These include two isomeric bicarbazoles, a bis(dibenzothiophene‐S,S‐dioxide) and a bis(thioxanthene‐S,S... Read More about Conformational Dependence of Triplet Energies in Rotationally Hindered N‐ and S‐Heterocyclic Dimers: New Design and Measurement Rules for High Triplet Energy OLED Host Materials.

Hot Vibrational States in a High-Performance Multiple Resonance Emitter and the Effect of Excimer Quenching on Organic Light-Emitting Diodes (2021)
Journal Article
Stavrou, K., Danos, A., Hama, T., Hatakeyama, T., & Monkman, A. (2021). Hot Vibrational States in a High-Performance Multiple Resonance Emitter and the Effect of Excimer Quenching on Organic Light-Emitting Diodes. ACS Applied Materials and Interfaces, 13(7), 8643-8655. https://doi.org/10.1021/acsami.0c20619

The photophysics of multiple resonance thermally activated delayed fluorescence molecule ν-DABNA is described. We show coupling of a 285 cm–1 stretching/scissoring vibrational mode of peripheral phenyl rings to the S1 state, which dictates the ultima... Read More about Hot Vibrational States in a High-Performance Multiple Resonance Emitter and the Effect of Excimer Quenching on Organic Light-Emitting Diodes.

The Critical Role of nπ* States in the Photophysics and Thermally Activated Delayed Fluorescence of Spiro Acridine-Anthracenone (2021)
Journal Article
Gomes Franca, L., Long, Y., Li, C., Danos, A., & Monkman, A. (2021). The Critical Role of nπ* States in the Photophysics and Thermally Activated Delayed Fluorescence of Spiro Acridine-Anthracenone. Journal of Physical Chemistry Letters, 12(5), 1490-1500. https://doi.org/10.1021/acs.jpclett.0c03314

The molecular photophysics and thermally activated delayed fluorescence (TADF) in spiro compounds are distinct because of the rigid orthogonal C–C bridging bond between donor and acceptor. The photophysics is found to be highly complex, with unpreced... Read More about The Critical Role of nπ* States in the Photophysics and Thermally Activated Delayed Fluorescence of Spiro Acridine-Anthracenone.

Enhancement of thermally activated delayed fluorescence properties by substitution of ancillary halogen in a multiple resonance-like diplatinum(ii) complex (2021)
Journal Article
Pander, P., Zaytsev, A. V., Sil, A., Williams, J. G., Kozhevnikov, V. N., & Dias, F. B. (2022). Enhancement of thermally activated delayed fluorescence properties by substitution of ancillary halogen in a multiple resonance-like diplatinum(ii) complex. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4851-4860. https://doi.org/10.1039/d1tc05026e

We present an in-depth investigation of the influence of chloro-to-iodo exchange on the thermally activated delayed fluorescence (TADF) of a dinuclear platinum(II) complex featuring monodentate halide ancillary ligands. The complexes are constructed... Read More about Enhancement of thermally activated delayed fluorescence properties by substitution of ancillary halogen in a multiple resonance-like diplatinum(ii) complex.

‘The Moon Quivered Like a Snake’: A Medieval Chronicler, Lunar Explosions, and a Puzzle for Modern Interpretation (2020)
Journal Article
Gasper, G. E., & Tanner, B. K. (2020). ‘The Moon Quivered Like a Snake’: A Medieval Chronicler, Lunar Explosions, and a Puzzle for Modern Interpretation. Endeavour, 44(4), Article 100750. https://doi.org/10.1016/j.endeavour.2021.100750

Despite some scepticism, the suggestion by Hartung in 1976 that the report in the chronicle of Gervase of Canterbury corresponded to a meteorite impact with the moon in 1178, creating the Giordano Bruno crater, retains considerable support, particula... Read More about ‘The Moon Quivered Like a Snake’: A Medieval Chronicler, Lunar Explosions, and a Puzzle for Modern Interpretation.

Cyclophane Molecules Exhibiting Thermally Activated Delayed Fluorescence: Linking Donor Units to Influence Molecular Conformation (2020)
Journal Article
Hempe, M., Harrison, A. K., Ward, J. S., Batsanov, A. S., Fox, M. A., Dias, F. B., & Bryce, M. R. (2021). Cyclophane Molecules Exhibiting Thermally Activated Delayed Fluorescence: Linking Donor Units to Influence Molecular Conformation. Journal of Organic Chemistry, 86(1), 429-445. https://doi.org/10.1021/acs.joc.0c02174

The synthetic methodology to covalently link donors to form cyclophane-based thermally activated delayed fluorescence (TADF) molecules is presented. These are the first reported examples of TADF cyclophanes with “electronically innocent” bridges betw... Read More about Cyclophane Molecules Exhibiting Thermally Activated Delayed Fluorescence: Linking Donor Units to Influence Molecular Conformation.

Extended ligand conjugation and dinuclearity as a route to efficient platinum-based near-infrared (NIR) triplet emitters and solution-processed NIR-OLEDs (2020)
Journal Article
Shafikov, M. Z., Pander, P., Zaytsev, A. V., Daniels, R., Martinscroft, R., Dias, F. B., …Kozhevnikov, V. N. (2021). Extended ligand conjugation and dinuclearity as a route to efficient platinum-based near-infrared (NIR) triplet emitters and solution-processed NIR-OLEDs. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(1), 127-135. https://doi.org/10.1039/d0tc04881j

Near infrared (NIR) emission from molecular materials is typically targeted by using more extended conjugated systems compared to visible-emitting materials. But efficiencies usually fall off due to the combined effects of increasing non-radiative an... Read More about Extended ligand conjugation and dinuclearity as a route to efficient platinum-based near-infrared (NIR) triplet emitters and solution-processed NIR-OLEDs.

Suppressing Dimer Formation by Increasing Conformational Freedom in Multi-Carbazole Thermally Activated Delayed Fluorescence Emitters (2020)
Journal Article
Salah, L., Etherington, M., Shuaib, A., Danos, A., Nazeer, A., Ghazal, B., …Makhseed, S. (2021). Suppressing Dimer Formation by Increasing Conformational Freedom in Multi-Carbazole Thermally Activated Delayed Fluorescence Emitters. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(1), 189-198. https://doi.org/10.1039/d0tc04222f

Ideal emitters for organic light-emitting diodes (OLEDs) are capable of efficiently harvesting non-emissive triplet states, have high colour stabilities, and possess high photoluminescence quantum yields (PLQYs). Maintaining colour stability and PLQY... Read More about Suppressing Dimer Formation by Increasing Conformational Freedom in Multi-Carbazole Thermally Activated Delayed Fluorescence Emitters.

Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging (2020)
Journal Article
Mendis, B. G., Barthel, J., Findlay, S. D., & Allen, L. J. (2020). Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging. Microscopy and Microanalysis, 26(6), 1147-1157. https://doi.org/10.1017/s1431927620024605

Electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) are used to extract crystallographic information from bulk samples, such as their crystal structure and orientation as well as the presence of any dislocation and... Read More about Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging.

Optical properties and carrier dynamics in Co-doped ZnO nanorods (2020)
Journal Article
Sivan, A. K., Galán-González, A., Di Mario, L., Tappy, N., Hernández-Ferrer, J., Catone, D., …Martelli, F. (2021). Optical properties and carrier dynamics in Co-doped ZnO nanorods. Nanoscale Advances, 3(1), 214-222. https://doi.org/10.1039/d0na00693a

The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic% in the growth solution. O... Read More about Optical properties and carrier dynamics in Co-doped ZnO nanorods.

Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence (2020)
Journal Article
Pander, P., Turnbull, G., Zaytsev, A. V., Dias, F. B., & Kozhevnikov, V. N. (2021). Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence. Dyes and Pigments, 184, Article 108857. https://doi.org/10.1016/j.dyepig.2020.108857

This work describes an application of 1,2,4-triazine methodology for the synthesis of novel cyclometallated Pt (II) complexes of C^N type. It is shown that addition of a cyclopenteno unit into the complex structure not only facilitates the fabricatio... Read More about Benzannulation via the use of 1,2,4-triazines extends aromatic system of cyclometallated Pt(II) complexes to achieve candle light electroluminescence.

Efficient UV Luminescence from Organic-Based Tamm Plasmon Structures Emitting in the Strong Coupling Regime (2020)
Journal Article
Morozov, K. M., Ivanov, K. A., Belonovski, A. V., Girshova, E. I., Pereira, D. D. S., Menelaou, C., …Kaliteevski, M. A. (2020). Efficient UV Luminescence from Organic-Based Tamm Plasmon Structures Emitting in the Strong Coupling Regime. Journal of Physical Chemistry C, 124(39), 21656-21663. https://doi.org/10.1021/acs.jpcc.0c05091

Excitons in organic semiconductors possessing a large oscillator strength demonstrate strong coupling with cavity modes at room temperature. A large Stokes shift in some organic semiconductors enriches and complicates the picture of the emission in s... Read More about Efficient UV Luminescence from Organic-Based Tamm Plasmon Structures Emitting in the Strong Coupling Regime.