E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Optical and scintillation properties of pure and Ce³⁺ doped GdBr₃
Optics Communications 189, 297-304 (2001)                 

Abstract: Optical and scintillation properties of pure GdBr₃ and GdBr₃:2% Ce³⁺ are presented. Under optical excitation, Ce³⁺ luminescence is observed between 350 and 550 nm with maxima at 413 and 446 nm. The Stokes shift is ~3400 cm^–1. GdBr₃:2% Ce³⁺ shows a high light output of 44 000±4000 photons per MeV of absorbed g-ray energy. The scintillation decay curve can be characterized by three decay components with decay times of 20.0±0.1, 212±12 ns and 13.5±0.5 ms, respectively.