Tunable broadband photoluminescence from bismuth‐doped calcium aluminum germanate glasses prepared in oxidizing atmosphere

• DOI: 10.1111/jace.18513
• Publication Date: 2022-04-26T17:57:12Z
• Authors: Jiangkun Cao; Yicong Ding; René Limbach; Vahid Nozari; Roman Sajzew; Minghui Sun; Pengzhu Zhang; Lothar Wondraczek
• Keywords: Bismuth; Germanate; Bismuth germanate; Calcium aluminosilicate

Abstract Tunable photoluminescence (PL) from transparent inorganic glass matrices is of interest for applications demanding a semitransparent photoconverter that does not elastically scatter incoming light. For this purpose, bismuth (Bi)‐doped optical materials exhibit unique spectral characteristics in terms bandwidth and emission tunability. Here, we demonstrate facile route preparing such converters Bi‐doped calcium‐aluminate calcium‐aluminogermanate glasses. These glasses offer tunable PL across the near violet visible‐to‐near‐infrared (NIR) range, with an lifetime range 300 μs. The addition GeO 2 exerts decrease basicity, which turn enables stabilization NIR‐active low‐valence Bi species broadband NIR PL.