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PhD Scholarship in Thermally Activated Delayed Fluorescence (TADF) based Hyperflourescence OLEDs


School of Engineering

About the Project

Currently lighting is consuming more than 20% of total global energy due to energy inefficient lighting source. The development of efficient lighting sources will not only have economic impact but will also address the urgent need to reduce carbon emissions.

Organic light-emitting diodes (OLEDs), a multibillion pound market has the potential to provide cheap and clean solid-state lighting with minimal environmental impact. The devices with heavy metal-induced spin-orbital coupling effect, i.e. phosphorescence emitters, and purely organic TADF emitters, are now regularly been reported with more than 20% external quantum efficiencies. However, due to the nature of charge transfer and long exciton lifetime, many devices exhibited broadband emission profiles and serious efficiency roll-offs, this will sacrifice the colour purity for high-performance displays and efficiency loss at high brightness.

This PhD project, joint between LSBU, University of St Andrews and industrial partner “Edinburgh Instruments Ltd”, aims to solve above mentioned problems via sensitization process by separating the exciton generation and recombination sites. For that, PhD student will design, synthesize, and screen the thermally activated delayed fluorescence (TADF) compounds with short exciton lifetimes, high radiative and reverse intersystem crossing rate as the sensitizers. To efficiently sensitize an emitter, the project aims to correlate the energy transfer efficiency with the quantum yield, rate constants of the sensitizer.

The outcomes of this project for the PhD candidate are listed below:
• synthesis of highly efficient TADF sensitizer;
• gain experience in time-resolved spectroscopy and other characterisation techniques;
• perform experimental measurements to develop the general rules of a good TADF sensitizer;
• fabrication of highly efficient Hyperflourescence OLEDs;
• present the findings of the project in international conferences;
• perform high-quality research and publish it as journal articles.

This will be a 3.5-year fully funded studentship for an EU/UK and overseas applicants who are keen to conduct research in TADF Hyperflourescence OLEDs at LSBU in the School of Engineering and also willing to travel to St Andrews and Edinburgh.

Supervisory Team:


The successful applicant will be working with Dr Tariq Sajjad
(https://scholar.google.co.uk/citations?user=cN5jPLMAAAAJ&hl=en ) at LSBU, Prof Eli Zysman-Colman (https://scholar.google.co.uk/citations?hl=en&user=PtoQFloAAAAJ) at St Andrews and Alistair Rennie at Edinburgh Instruments, who aim to develop new emitters for lighting and communication. As a PhD student, you will join the London Centre for Energy Engineering (http://www.lsbu.ac.uk/research/centres-groups/advanced-materials) and work alongside a range of new and experienced PhD students in a collaborative environment.

Informal enquiries should be directed to Dr Tariq Sajjad () or Alistair Rennie (). Please send a copy of your CV with a covering letter directly to Dr Tariq Sajjad before applying.

Requirements:


Applicants must be of outstanding academic merit and should have (or be expected to gain) either a first class or an upper second class Honours degree (or the international equivalent), or an MSc/MRes with distinction. Enthusiastic and self-motivated candidates from all countries with a background in either Material Science, Chemistry or Physics or a related discipline are encouraged to apply. A good knowledge or experience in Material synthesis, material characterisation along with device fabrication would be advantageous.

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