SrAl₂O₄: Eu, Dy, B particles were added in a phosphate glass (90NaPO₃-10NaF (in mol%)) using the direct doping method. For the first time, the composition of the particles prior to and after embedding them in the glass was analysed using EPMA analysis. Boron was found to be incorporated in already distorted surroundings creating new trapping centers in the particles which are thought to be favourable for the tunnelling process and so for the afterglow at 10K. Despite the partial decomposition of the particles, the glass exhibit afterglow at low temperature confirming to be promising materials for low temperature applications. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.