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Updated: Oct 15, 2025

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Red emitting Sm(II) phosphors: thermally switchable luminescence in Sm(AlX4)2 (X = Cl, Br) by 5d-4f and intra-4f
T C Schäfer1, J R Sorg1, A E Sedykh1
1Institute of Inorganic and Analytical Chemistry, Justus-Liebig Universität Gießen, Heinrich-Buff-Ring-17, DE-35392 Gießen, Germany. klaus.mueller-buschbaum@anorg.chemie.uni-giessen.de.
Abstract:
Divalent samarium compounds of the constitution Sm(AlX4)2, X = Cl, Br, show remarkable luminescence of Sm2+. At room temperature, the luminescence is dominated by parity-allowed broad-band 4f55d1 → 4f6 emission with additional 5D0 → 7F narrow-line emission. At 79 K, only the intra-4f-emission is observed, rendering the mechanism thermally switchable. The luminescence processes and their temperature dependence were determined including lifetime investigations for both, room temperature and 79 K, as well as quantum efficiency determinations. In addition, a new pathway for the synthesis of Sm(AlCl4)2 and the previously unknown Sm(AlBr4)2 is reported.
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