Abstract
The scintillation and luminescence properties of pure CsBa2I5 and CsBa2I5 doped with 0.5% Eu and 5% Eu were studied between 78K and 600K. Single crystals were grown by the vertical Bridgman method from the melt. CsBa2I5:5% Eu showed a light yield of 80,000 photons/MeV, an energy resolution of 2.3% for the 662keV full absorption peak, and an excellent proportional response. Two broad emission bands centered at 400nm and 600nm were observed in the radioluminescence spectrum of pure CsBa2I5. The Eu2+ 5d–4f emission band was observed at 430nm. The radiative lifetime of the Eu2+ excited state was determined as 350ns. With increasing temperature and Eu concentration the Eu2+ emission shifts to longer wavelengths and its decay time lengthens as a result of self-absorption of the Eu2+ emission. Multiple thermoluminescence glow peaks and a sharp decrease of the light yield at temperatures below 200K were observed and related to the presence of the charge carrier traps in CsBa2I5:Eu.
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