02/04/2021
The Human Resources Strategy for Researchers

Phd contract in the field of Chemistry financed for three years by the University of Clermont Auvergne

This job offer has expired


  • ORGANISATION/COMPANY
    Université Clermont Auvergne
  • RESEARCH FIELD
    Chemistry
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    23/05/2021 00:00 - Europe/Brussels
  • LOCATION
    France › AUBIERE
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/10/2021
  • REFERENCE NUMBER
    SF-CD-2021-006

OFFER DESCRIPTION

Synthesis and characterization of nanophosphors suitables for micro-LEDs-based devices

Besides the more and more common use of Light Emitting Diodes (LEDs) in our everyday life, a new type of miniature LEDs (micro-LEDs) has emerged last years. This pioneering technology,developed by a team of CEA LETI, represents an importantstep forward for many applications such as smart lighting devices, augmented reality using smart glassesor even3D flexible, large and transparent screens.The phosphors currently used in solid-state lightingare not suitable for micro-LEDs based devices, especially because of their size. When using micro-LEDs displays, the elementary unit is a pixel made of an InGaN blue LED structured on a micrometric scale (pixel size comprised between 3 and 10 μm). As for White LEDs (WLEDs), blue light emitted by InGaN has to be converted in white, red or green light using color-converting phosphors. A breakthrough technology employing tailorable submicronic, even nanometric, phosphors is thus required.Size reduction of phosphors can be carried out using two strategies: a top-down approach based on a grinding process which generally generates a lot of defects causing a significant decrease in emission properties of the ground phosphors; a bottom-up approach leading to nanophosphors whose optical features are far from competing with those of micrometric phosphors.Only the quantum dots (QDs) based on cadmium currently provide both interesting performances and sizes compatible with the foreseen applications,but their toxicity hampers them to be widely used over the long term. Furthermore, like organic phosphors, QDs are not stable under thermalor photonic stresses which represents a crippling point for their use in micro-LEDs displays. The development of highly performant and stable nanophosphors thus remains a big challenge. It is in this context that this thesis should be consideredsince its main objective will be the elaboration of inorganic efficient and eco-friendly nanophosphors whose featureswill be stable under both photonic and heatstresses.Phosphors will be elaborated through soft-chemistry processes (microwave assisted or not solvothermal way for example) for which different parameters will be optimized (solvent, pH, temperature, duration...). Studies in surface chemistry will also be led to improve the optical properties of the elaborated nanophosphors. The developed matrices will belong to aluminates or vanadates families.

More Information

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Chemistry: Master Degree or equivalent
Work location(s)
1 position(s) available at
Chemistry Institute of Clermont-Ferrand
France
Région Auvergne Rhône-Alpes
AUBIERE
63178
Campus Universitaire des Cézeaux TSA 60026 - CS 60026 24, Avenue Blaise Pascal

Open, Transparent, Merit based Recruitment procedures of Researchers (OTM-R)

Know more about it at Université Clermont Auvergne

Know more about OTM-R

EURAXESS offer ID: 622937

Disclaimer:

The responsibility for the jobs published on this website, including the job description, lies entirely with the publishing institutions. The application is handled uniquely by the employer, who is also fully responsible for the recruitment and selection processes.

 

Please contact support@euraxess.org if you wish to download all jobs in XML.