Luminescent glasses and ceramics for improving the efficiency of photovoltaic solar cells
type: Dataset
description: The objective of the present work is to develop luminescent materials with a quantum yield higher than 100% for improving the conversion efficiency of photovoltaic solar cells. The study is focused on rare-earth-doped sulfide-based materials with low phonon energy. The multiplication of photon is firstly studied in rare-earths doped Ga₂S₃-GeS₂-CsCl glasses. It has been demonstrated that one visible photon can be divided into two NIR photons by the rare earth couples Er³⁺/Yb³⁺ou Pr³⁺/Yb³⁺. However, the overall quantum yield measured with an integrating sphere is much lower than 100%. The low quantum yield is attributed to the high concentration of impurities acting as "luminescence killers" and to the charge-transfer absorption of Yb³⁺ which is located in the visible region in sulfides. The rare-earth oxysulfides are then introduced as matrix since the partial substitution of sulfur by oxygen shifts the charge transfer band of Yb³⁺ to the UV region. The oxysulfides with high purity are prepared by combustion method with subsequent sulfuration. The multiplication of photon in the NIR is confirmed in La₂O₂S doped with Pr³⁺/Yb³⁺, Er³⁺,Yb³⁺ and Tb³⁺/Yb³⁺. To the best of our knowledge, it is the first time that quantum yield higher than 100% is directly measured in La₂O₂S : Er³⁺,Yb³⁺. A core-shell structure is designed to sensitize Er3+ in the oxysulfides by Ce³⁺ in the YAG. By homogeneous precipitation with urea, the Y₂O₂S is precipitated on the fine powders of YAG : Ce³⁺. Although the desired structure is not yet obtained due to the diffusion of Er³⁺ into the YAG, further efforts on this subject seem promising to invent spectral convertors with large and intense absorption band.
landing page: https://theses.hal.science/tel-00794364
identifier: NNT: 2012REN1S133
keyword: cellules-solaires-photovoltaiques
keyword: ceramiques-luminescentes
keyword: chimmatechemical-sciencesmaterial-chemistry
keyword: infoeu-reposemanticsdoctoralthesis
keyword: photoluminescence
keyword: photovoltaic-solar-cells
keyword: rare-earths
keyword: rendement-quantique
keyword: spectroscopie
keyword: spectrum-analysis
keyword: sulphides-glasses
keyword: terre-rare
keyword: theses
keyword: verres-de-sulfure
keyword: ytterbium
issued: 2026-05-14T04:18:57.524109
modified: 2026-05-14T04:18:57.524115
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Luminescent glasses and ceramics for improving the efficiency of photovoltaic solar cells
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00794364
issued: 2026-05-14T04:18:57.585329
modified: 2026-05-14T04:18:57.495789