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PhD on Photophysical study of exciton quenching processes in OLEDs

PhD on Photophysical study of exciton quenching processes in OLEDs

Applied Physics and Science Education
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Job description

Job description

Are you eager to work as an experimental photophysicist on unraveling the mechanisms that limit the efficiency of displays and other applications of organic light-emitting diodes (OLEDs)? In this PhD project, you will experimentally study the interaction of the excited organic molecules in OLEDs with charges and with other excited molecules. Your work will provide the experimental validation of novel theoretical and advanced simulation methods that are developed by two other PhD students. The breakthroughs that you develop, in this team, will advance our fundamental understanding of the functioning of OLEDs and will allow industry to increase the efficiency and lifetime.

The project

In OLEDs, an electrical current through an organic layer structure leads to the formation of electron-hole pairs (“excitons”) that can decay radiatively. The efficiency with which this light-emission process occurs can be very large when the current density is small. However, at large current densities the excitons can be lost due to an interaction with a hole or an electron (“quenching”). Also exciton-exciton interactions, leading to the loss of an exciton, can then become strong. These two important loss processes are so far only understood in an empirical and phenomenological way. In the project “SEQUIOA” (Suppressing Exciton Quenching in OLEDs: an Integrated Approach) we aim at developing an experimentally validated simulation tool that enables carrying out predictive molecular-scale calculations of exciton quenching. This project of three PhD students is a collaboration between the group Molecular Materials and Nanosystems (M2N) of the Applied Physics and Science Education Department of the TU/e (experiment and theory, and the group Theoretical Chemistry in the Faculty of Science of the Vrije Universiteit of Amsterdam (VU-A). The project is supported by world‑leading companies on the development of advanced functional materials (Merck, Germany) and on advanced simulation software tools (SCM and Simbeyond, The Netherlands).

The experimental project at TU/e will be carried out under the supervision of prof. dr. Reinder Coehoorn in the M2N group, in collaboration with prof. dr. Peter Bobbert in the M2N group, who supervises the theory part of the project. The group has an extensive experimental infrastructure for photophysical experiments on thin films and devices, enabling carrying out time-resolved photoluminescence studies and studies that probe the electronic structure, such as ultraviolet photoelectron spectroscopy (UPS). The group has a vast experience on the development and application of Monte Carlo simulations, which in a collaboration with VU-A will be further developed so that the simulations provide molecule-specific predictions. The company Merck will provide state-of-the-art OLED materials and devices.

Job requirements

  • A master’s degree in physics or physical chemistry.
  • Affinity with organic electronics and photophysical experiments.
  • A research-oriented attitude.
  • An application-oriented attitude.
  • Ability to work in a team and interested in collaborating with academic and industrial
  • partners.
  • Perfect social and communicative skills.
  • Fluent in spoken and written English.

Conditions of employment

  • A meaningful job in a dynamic and ambitious university with the possibility to present your work at international conferences.
  • A full-time employment for four years, with an intermediate evaluation (go/no-go) after nine months.
  • To develop your teaching skills, you will spend 10% of your employment on teaching tasks.
  • To support you during your PhD and to prepare you for the rest of your career, you will make a Training and Supervision plan and you will have free access to a personal development program for PhD students (PROOF program).
  • A gross monthly salary and benefits (such as a pension scheme, pregnancy and maternity leave, partially paid parental leave) in accordance with the Collective Labor Agreement for Dutch Universities.
  • Additionally, an annual holiday allowance of 8% of the yearly salary, plus a year-end allowance of 8.3% of the annual salary.
  • Should you come from abroad and comply with certain conditions, you can make use of the so-called ‘30% facility’, which permits you not to pay tax on 30% of your salary.
  • A broad package of fringe benefits, including an excellent technical infrastructure, moving expenses, and savings schemes.
  • Family-friendly initiatives are in place, such as an international spouse program, and excellent on-campus children day care and sports facilities.

Information and application

More information

Do you recognize yourself in this profile and would you like to know more? Please contact
prof.dr. Reinder Coehoorn, r.coehoorn[at]

For information about terms of employment, click here or contact HRServices.Flux[at]

Please visit to find out more about working at TU/e!


We invite you to submit a complete application by using the 'apply now'-button on this page.

The application should include a:

  • Cover letter in which you describe your motivation and qualifications for the position.
  • Curriculum vitae, including a list of your publications and the contact information of
    three references.
  • Brief description of your MSc thesis.

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Screening will continue until the position has been filled.

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