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PhD student (Physics and Engineering of Electrical Discharges, Electrical and Optical Characterization Techniques, Vacuum Techniques) (M/W)

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Date Limite Candidature : samedi 31 octobre 2020

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General information

Reference : UMR5821-CHRVEL-078
Date of publication : Saturday, October 10, 2020
Scientific Responsible name : Madame Ana LACOSTE
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 January 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

New fluorescent lamp hybrid technology based on positive column, initiated at the cathode by surface-wave plasma, and molecular UV emitters S2 and N2/O2 as a replacement for mercury. Characterization of the lighting performance of prototype lamps with dedicated phosphors.
The research project developed in the framework of the thesis is part of the current context of energy transition, reduction of pollution and energy consumption. It targets, in particular, the field of lighting and proposes the realization and study of a new concept of mercury-free lamps and energy efficiency superior to existing lighting devices on the market. This new concept is based, on the one hand, on a hybrid technology that combines a microwave discharge with a positive column discharge and, on the other hand, on the use of distinct emitting gases (S2, N2/O2) for which the wavelength range close to the visible will be exploited.
The thesis work consists in the design and progressive implementation of lamp models for each type of emitting gas and adapted phosphors, up to the prototype model, with the objective of optimizing the yields at different levels: coupling from the generators to the discharge, production of UV photons close to the visible, nominal luminous efficiency.
This work will therefore be conducted in iterative stages in order to determine the best sets of operating parameters (geometry, gas pressure and composition, nature of the phosphors) to be validated in the lamp models and implemented in the sealed prototypes. Step by step, the energetic qualification of the discharge, as well as photometric and luminous efficiency measurements will be performed using plasma and lighting specific characterization techniques such as vector network analyzer, optical emission spectroscopy, radiometry, video-colorimetry, spectrophotometry.

Work Context

The LPSC is a joint UGA/CNRS research unit with a staff of 210 people (researchers, teacher-researchers and doctoral students, engineers and technicians on permanent and fixed-term contracts, organized into 15 research teams, 5 technological platforms and 8 departments. The PhD student will carry out his work within the Plasma-Materials-Nanostructures team and will be placed under the responsibility of the head of the Plasma-Materials-Nanostructures team, Mrs. Ana Lacoste who will also be the PhD supervisor.
The work envisaged is an integral part of the objectives set within the framework of the ANR2020 (PRC) ADELINE project which relies on the collaboration of three research laboratories (LPSC, ICCF, Pprime) and brings together expertise in physics and engineering fields, phosphor synthesis and lighting measurements. The work will mainly take place on the LPSC site located at the Grenoble Scientific Polygon.
Within the framework of the collaborative project, the PhD student will occasionally travel to the ICCF (Clermont Ferrand) and the Pprime laboratory (Poitiers).

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