Research areas
Polymer optoelectronics.
Most polymers, or plastics, are electrical insulators. However there is one class of polymers, known as 'conjugated' polymers which can conduct electricity. These materials are semiconductors, and open new directions in optoelectronics. They combine novel semiconducting electronic properties with the processing flexibility of polymers. When a voltage is applied to them, they emit light, providing an important new display technology that could give flat and even flexible displays. Semiconducting polymers can be used to make field effect transistors, solar cells, and even lasers. In the polymer optoelectronics group we seek to understand the physics of these remarkable materials and devices, with the aim of improving them. The research has both fundamental and applied aspects, and the main activities are: - optical amplifiers - wavelength scale microstructure - new materials - charge transport in LEDs - understanding the light emission process
I am also researching fluorescence and its applications in medicine and biology.
For further information, see the Organic Semiconductor Centre and the Polymer Optoelectronics group website.
PhD supervision
- Olga Filippova
- Madeleine Fisher
- Liam King
- Chico Paulics Bresler
- Benedict Paulukiewicz
- Thomas Sayner
- Egle Tankeleviciute
- Kaiyang Wei
- Yuchen Zhang
Selected publications
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Open access
Chiral selenium-integrated multi-resonant thermally activated delayed fluorescent emitters showing improved reverse intersystem crossing rate
Wang, J., Hafeez, H., Chen, D., Ortiz, J. S. O., Xu, Y., McKay, A. P., Cordes, D. B., Crassous, J., Samuel, I. D. W. & Zysman-Colman, E., 11 Aug 2025, In: Angewandte Chemie International Edition. 64, 33, 12 p., e202506999.Research output: Contribution to journal › Article › peer-review
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Open access
Common mechanism of dual emission in linearly-linked donor-acceptor-type thermally activated delayed fluorescence molecules
Ryu, T., Ruseckas, A., Saigo, M., Miyata, K., Tsuchiya, Y., Nakanotani, H., Adachi, C., Samuel, I. D. W. & Onda, K., 3 Jun 2025, (E-pub ahead of print) In: Physical Chemistry Chemical Physics. Advance Article, 10 p.Research output: Contribution to journal › Article › peer-review
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Open access
Deep-red to NIR solution-processed OLEDs of donor-decorated quinoxaline-based TADF aggregates
Gupta, A. K., Cordes, D. B., De, J., Slawin, A. M. Z., Warriner, S., Samuel, I. D. W. & Zysman-Colman, E., 28 Mar 2025, In: Journal of Materials Chemistry C. 13, 12, p. 6123-6135 13 p.Research output: Contribution to journal › Article › peer-review
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Open access
Exploring the impact of the presence of 9,9’-spirobifluorene moieties on the performance of carbonyl-based multiresonant thermally activated delayed fluorescence organic light-emitting diodes
Haug, J. J., Wu, S., Hafeez, H., Schustek, M., Fatahi, M., Woordes, Y. T., Nieger, M., Fuhr, O., Luy, B., Samuel, I. D. W., Bräse, S. & Zysman-Colman, E., 14 Nov 2025, (E-pub ahead of print) In: Advanced Optical Materials. Early View, 14 p., e02118.Research output: Contribution to journal › Article › peer-review
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Open access
High-speed organic light-emitting diodes based on dinaphthylperylene achieving 4-Gbps communication
Yoshida, K., Majlesein, B., Chen, C., Haas, H., Turnbull, G. A. & Samuel, I. D. W., 12 Jun 2025, In: Advanced Photonics. 7, 3, 10 p., 036005.Research output: Contribution to journal › Article › peer-review
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Open access
In-operando investigation of Purcell effect on efficiency roll-off in top-emitting phosphorescent organic light emitting diodes
Riahi, M., Yoshida, K., King, L. G. & Samuel, I. D. W., 1 Jun 2025, In: Synthetic Metals. 312, 6 p., 117848.Research output: Contribution to journal › Article › peer-review
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Open access
Method for measuring exciton-exciton annihilation rate constants in thermally activated delayed fluorescent (TADF) emitters to understand efficiency roll-off in OLEDs
Zhang, L., Ruseckas, A., Yoshida, K., King, L. G., Madayanad Suresh, S., Zysman-Colman, E. & Samuel, I. D. W., 14 Nov 2025, (E-pub ahead of print) In: Materials Horizons. Advance Article, 8 p.Research output: Contribution to journal › Article › peer-review
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Open access
OLED illuminated metasurfaces for holographic image projection
Gong, J., Biabanifard, M., Yoshida, K., Turnbull, G. A., Di Falco, A. & Samuel, I. D. W., 27 Aug 2025, In: Light: Science & Applications. 14, 9 p., 294.Research output: Contribution to journal › Article › peer-review
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Open access
Visible light communication using thermally activated delayed fluorescent OLEDs
King, L. G., Majlesein, B., Osahon, I. N. O., Yoshida, K., Haas, H. & Samuel, I. D. W., 19 Sept 2025, In: Device. 3, 9, 8 p., 100835.Research output: Contribution to journal › Article › peer-review
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Open access
[2.2]Paracyclophane-substituted chiral multiresonant thermally activated delayed fluorescence emitters for efficient organic light-emitting diodes
Xu, Y., Hafeez, H., Seibert, J., Wu, S., Ortiz, J. S. O., Crassous, J., Bräse, S., Samuel, I. D. W. & Zysman-Colman, E., 19 Nov 2024, In: Advanced Functional Materials. 34, 47, 9 p., 2402036.Research output: Contribution to journal › Article › peer-review