Dr Paloma L dos Santos
Department of Electronic and Electrical Engineering
Lecturer in Semiconductor Materials and Devices
Full contact details
Department of Electronic and Electrical Engineering
Sir Frederick Mappin Building
I received my PhD degree in Physics from Durham University in September 2018. Following that, I was one-year PDRA at St Andrews University, then one-year PDRA at Cavendish Laboratory (University of Cambridge), where I also took a maternity break. In 2022, I re-joined Durham University for another year PDRA and in April 2023, I became a lecturer at Sheffield University.
My research expertise is on Organic (carbon-based) Electronics, in special, energy-efficient organic light-emitting diodes (OLEDs). OLEDs as one of the leaders of the display revolution over the past decade, have shown huge advantages over other popular technologies, such as Liquid Crystal Displays (LCDs), as they provide better contrast ratios, wider viewing-angles, can be mechanically flexible and consume less power. Current commercial products utilizing OLED technology includes bendable smartphones, rollable TVs and smart vision VR glasses. Yet, this fascinating technology still faces big challenges regarding energy conversion, operational lifetime, and colour purity.
I am particularly interested in understanding the optoelectronic mechanisms of materials that convert electrical energy into light efficiently and use them to build novel devices that consume less power than commercial ones.
I am very enthusiastic about my research, teaching and promoting a dynamic, cross-disciplinary, multicultural and supportive work environment.
- PhD in Physics, University of Durham, 2018
- M.Sc. in Physics, Federal University of Minas Gerais (UFMG), 2014
- B.Sc in Physics, Federal University of Minas Gerais (UFMG), 2012
- Research interests
- Organic semiconductors
- Optical Spectroscopy
- Donor Influence on the Optoelectronic Properties of N‐Substituted Tetraphenylimidazole Derivatives. ChemistrySelect, 8(9).
- Fine‐Tuning the Photophysics of Donor‐Acceptor (D‐A 3 ) Thermally Activated Delayed Fluorescence Emitters Using Isomerisation. ChemPhotoChem, 7(2).
- Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films. ACS Applied Electronic Materials, 4(7), 3486-3494.
- Exact Solution of Kinetic Analysis for Thermally Activated Delayed Fluorescence Materials. The Journal of Physical Chemistry A, 125(36), 8074-8089.
- Efficient Sky‐Blue Organic Light‐Emitting Diodes Using a Highly Horizontally Oriented Thermally Activated Delayed Fluorescence Emitter. Advanced Optical Materials, 8(23), 2001354-2001354.
- Excited State Dynamics of Thermally Activated Delayed Fluorescence from an Excited State Intramolecular Proton Transfer System. The Journal of Physical Chemistry Letters, 11(9), 3305-3312.
- Improving Processability and Efficiency of Resonant TADF Emitters: A Design Strategy. Advanced Optical Materials, 8(2), 1901627-1901627.
- Use of Pyrimidine and Pyrazine Bridges as a Design Strategy To Improve the Performance of Thermally Activated Delayed Fluorescence Organic Light Emitting Diodes. ACS Applied Materials & Interfaces, 11(48), 45171-45179.
- Molecular Design Strategies for Color Tuning of Blue TADF Emitters. ACS Applied Materials & Interfaces, 11(30), 27125-27133.
- Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores. Chemistry of Materials, 31(17), 6684-6695.
- Triazatruxene : a rigid central donor unit for a D-A3 thermally activated delayed fluorescence material exhibiting sub-microsecond reverse intersystem crossing and unity quantum yield via multiple singlet-triplet state pairs. Advanced Science, 5(6).
- β-carotene and oleic acid contributions to the optical properties of amazonic oils. Journal of Photochemistry and Photobiology A: Chemistry, 347, 93-97.
- Optical and Polarity Control of Donor–Acceptor Conformation and Their Charge-Transfer States in Thermally Activated Delayed-Fluorescence Molecules. The Journal of Physical Chemistry C, 121(30), 16462-16469.
- Synthesis of biscyclometalated iridium(III) acetylacetonate complexes via a 15 min bridge-splitting reaction, their characterisations and photophysical properties. Journal of Organometallic Chemistry, 851, 184-188.
- Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs. The Journal of Physical Chemistry Letters, 7(17), 3341-3346.
- Investigation of the Mechanisms Giving Rise to TADF in Exciplex States. The Journal of Physical Chemistry C, 120(32), 18259-18267.
- Spectroscopic studies of different poly3hexylthiophene chain environments in a polyfluorene matrix. Journal of Luminescence, 172, 118-123.
- Temperature resolved aggregate states in dialkoxyphenylene-thiophene oligomer. Chemical Physics Letters, 614, 67-71.
- Understanding molecular interactions in light-emitting polymer bilayers: The role of solvents and molecular structure on the interface quality. Applied Physics Letters, 104(16), 163301-163301.
- Measurement of interchain and intrachain exciton hopping barriers in luminescent polymer. Journal of Physics: Condensed Matter, 24(1), 015801-015801.
- Detection of acetone vapours using solution-processed tin oxide thin-film transistors. MRS Advances.
- Reducing lifetime in Cu(
i) complexes with thermally activated delayed fluorescence and phosphorescence promoted by chalcogenolate–diimine ligands. Journal of Materials Chemistry C, 8(41), 14595-14604.
- An unusual plank-shaped nematogen with a graphene nanoribbon core. Journal of Materials Chemistry C, 7(39), 12080-12085.
- Dynamics of aggregated states resolved by gated fluorescence in films of room temperature phosphorescent emitters. Physical Chemistry Chemical Physics, 21(7), 3814-3821.
- Chemical and conformational control of the energy gaps involved in the thermally activated delayed fluorescence mechanism. Journal of Materials Chemistry C, 6(18), 4842-4853.
- An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes. Scientific Reports, 7(1).
- Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters. Nature Communications, 8(1).
- The contributions of molecular vibrations and higher triplet levels to the intersystem crossing mechanism in metal-free organic emitters. Journal of Materials Chemistry C, 5(25), 6269-6280.
- 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.
- Engineering the singlet–triplet energy splitting in a TADF molecule. Journal of Materials Chemistry C, 4(17), 3815-3824.
Conference proceedings papers
- Explaining rISC and 100% efficient TADF (Conference Presentation). Organic Light Emitting Materials and Devices XX, 28 August 2016 - 1 September 2016.
- Research group
Semiconductor Materials and Devices