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Intrinsic emission of complex oxides with garnet structure was studied by means of the analyses of the time-resolved luminescence spectra and decay kinetic for single crystals (SC) and single-crystalline films (SCF) of Y 3 Al 5 O 12 (YAG) and Lu 3 Al 5 O 12 (LuAG) garnets under excitation by the pulse X-ray and synchrotron radiation at 8 -300 K. YAG and LuAG SC and SCF are characterized by significantly different concentration of the Y Al and Lu Al antisite defects (AD) due to the substantial difference in the conditions of their crystallization. For this reason, LuAG and YAG SC and SCF are very useful model objects for the study of nature of the intrinsic emission of these oxides, consisting of the excitons and AD luminescence.

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In the framework of its search for new heavy, fast, and radiation-hard scintillators for calorimetry at future colliders, the Crystal Clear Collaboration performed a systematic investigation of the properties and of the scintillation and radiation damage mechanisms of CeF 3 monocrystals. Many samples of various dimensions up to 3 × 3 × 28 cm 3 were produced by industry and characterized in the laboratories by different methods such as optical transmission, light yield and decay time measurements, excitation and emission spectra, gamma and neutron irradiations. The results of these measurements are discussed. The measured light yield is compared with the theoretical expectations. Tests in high-energy electron beams on a crystal matrix were also performed. The suitability of CeF 3 for calorimetry at high-rate machines is confirmed. Production and economic considerations are discussed.