New technology of hybrid positive column fluorescent lamp, initiated by surface wave plasma cathode, and molecular UV emitters S2 and N2 / O2 replacing mercury. Characterization of the lighting performance of lamps prototypes with dedicated luminopho ; Nouvelle technologie de lampe fluorescente à colonne positive hybride, initiée à la cathode par plasma à onde de surface, et émetteurs UV moléculaires S2 et N2/O2 en remplacement du mercure. Caractérisation des performances d'éclairage des prototypes de lampes avec luminophores dédiés

This thesis, funded by the ANR-20-CE05-0012 ADELINE project, focuses on the development of anew generation of mercury- and gallium-free fluorescent lamps. It is based on the UV + Visible emission from alow-pressure molecular discharge and its conversion into the visible range through phosphors suited to theemission spectrum of the discharge. The use of molecular emitters, typically reactive at high temperatures,requires the replacement of the hot cathode, as used in Ar-Hg fluorescent lamps. This work lies in thesubstitution of the hot cathode with a high-frequency (HF) wave applicator, which generates a plasmacomparable to that of a negative glow (NG) but with a significantly reduced cathode fall. This plasma can beadvantageously used with a positive column (PC) plasma, achieved when a hybrid HF&DC power supply isapplied. Additionally, a surface-wave HF discharge, obtained by modifying the applicator configuration, isproposed and studied for lighting applications. The aim was to maximize the luminous efficiency of the lamp,which involved optimizing both the energy flux of the discharge and the UV-to-visible conversion by thephosphors. A significant part of this work was dedicated to the determination with experimental and numericalapproaches, of the operating conditions (HF wave applicator and discharge tube geometry, DC voltage) thatoptimize the energy flux of the discharge. The study conducted in pure argon demonstrated the beneficial energycontribution of the PC plasma (6% energy efficiency for an HF&DC discharge versus 1.5% for an HFdischarge), a benefit that increases with the length of the PC. However, the significant emission differenceobserved under our working conditions between the various regions of the discharge (NG and PC). This madesurface-wave HF discharges more suitable for the intended application. The study of reactive mixtures clearlyshowed the advantage of the Ar-S₂ mixture over the Ar-N₂/O₂ mixture. This advantage is due to a better spectralemission distribution for Ar-S₂. This has a ...