Avoiding concentration quenching and self-absorption in CsEuX (X = Br, I) by Sm doping.

The benefits of doping CsEuBr and CsEuI with Sm are studied for near-infrared scintillator applications. It is shown that undoped CsEuI suffers from a high probability of self-absorption, which is almost completely absent in CsEuI:2% Sm. Sm doping is also used to gain insight in the migration rate of Eu excitations in CsEuBr and CsEuI, which shows that concentration quenching is weak, but still significant in the undoped compounds.