Molecule of the Month
July 2024
Scintillation and Optical Characterization of CsCu2I3 Single Crystals

CsCu2I3 is an interesting new small band gap scintillator:

  • It is nonhygroscopic and nontoxic, melts congruently, and has an extremely low afterglow, a density of 5.01 g/cm3, and an effective atomic number of 50.6.
  • The mean emission at 560 nm (yellow) matches detection with an avalanche photo diode.
  • A light yield of 36'000 photons/MeV and energy resolution of 4.82% were obtained.
  • The scintillation proportionality is on par with that of SrI2:Eu2+.
  • CsCu2I3 shows self-trapped exciton emission at room temperature.
  • The large Stokes shift of this emission ensures that this material is not sensitive to self-absorption.

This work was carried out in the groups of Prof. Dr. Pieter Dorenbos (TU Delft) and PD Dr. Karl Krämer (DCBP, Universität Bern).


  • J. J. van Blaaderen, L. A. van den Brekel, K. W. Krämer, P. Dorenbos;
    "Scintillation and Optical Characterization of CsCu2I3 Single Crystals from 10 to 400 K"
    Chem. Mater., 2023, 35(22), 9623-9631; doi:10.1021/acs.chemmater.3c01810.