HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

The adsorption of europium and terbium at the grain boundaries of bulk β-Si3N4 and β-Ge3N4 and the synergic combination of both results in intriguing luminescence properties of all compounds (red, green, orange and yellow).