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Active Colloidal-Quantum-Dot Light Emitting Devices: QD Laser and QD LEDs


   Cardiff School of Physics and Astronomy

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  Dr BH Hou, Prof Peter Smowton  Applications accepted all year round  Self-Funded PhD Students Only

About the Project

Realization of electrically pumped lighting and lasing with colloidal quantum dots will have a revolutionary impact on many disciplines including display, photonics, optical communication, chemical sensing, and medical diagnostics. Due to broadly tunable emission wavelengths and facile particle size-control and viable processability, colloidal quantum dots (QDs) are promising materials for attaining these goals. In this PhD project, we will use non-toxic QDs (InP/ZnS or CuInZnS3) with specially engineered structures to demonstrate LED and Laser devices that can be implemented into various applications such as optical communication, display or lighting.

Moreover, this project will also evolve different types of photonics or optics engineering. For instance, we will make QD LEDs that can be operated as both a light source and an optically pumped laser. Such photonics structures feature a distributed feedback resonator integrated into a bottom LED electrode, which can help us to obtain good confinement of a waveguided mode within the QD medium as well as demonstrate low-threshold lasing even with an ultrathin (about three QD monolayers) active layer. Through this project, the students will be well trained in the state-of-the-art solution-processed optoelectronics as well as fundamental laser physics.Realization of electrically pumped lighting and lasing with colloidal quantum dots will have a revolutionary impact on many disciplines including display, photonics, optical communication, chemical sensing, and medical diagnostics. Due to broadly tunable emission wavelengths and facile particle size-control and viable processability, colloidal quantum dots (QDs) are promising materials for attaining these goals. In this PhD project, we will use non-toxic QDs (InP/ZnS or CuInZnS3) with specially engineered structures to demonstrate LED and Laser devices that can be implemented into various applications such as optical communication, display or lighting.

Moreover, this project will also evolve different types of photonics or optics engineering. For instance, we will make QD LEDs that can be operated as both a light source and an optically pumped laser. Such photonics structures feature a distributed feedback resonator integrated into a bottom LED electrode, which can help us to obtain good confinement of a waveguided mode within the QD medium as well as demonstrate low-threshold lasing even with an ultrathin (about three QD monolayers) active layer. Through this project, the students will be well trained in the state-of-the-art solution-processed optoelectronics as well as fundamental laser physics.

Interested applicants can find out more about our PhD programme and apply via the following link: Physics and Astronomy - Study - Cardiff University

Please submit the following documents with your application:

  • All of your University level certificates and transcripts to date
  • Two references (at least one of these must be academic)
  • Your academic CV
  • Your personal statement

Funding Notes

Please note that bench fees may be charged in addition to tuition fees for this project. This will be confirmed as part of any formal offer for this project.

References

1. Nat Commun 11, 271 (2020).
2. Adv. Optical Mater. 1901362 (2020).
3. Isr. J. Chem. 59, 637 – 638 (2019).
4. Phys. Status Solidi A, 1900832 (2019).
5. Nature Photon 10, 307–311 (2016).

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