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The efficiency of X-ray-induced scintillation in glasses roughly depends on both the effective atomic number  Z  eff  and the photoluminescence quantum efficiency  Q  eff  of glass, which are useful tools for searching high-performance phosphors. Here, we demonstrate that the energy transfer from host to activators is also an important factor for attaining high scintillation efficiency in Ce-doped oxide glasses. The scintillation intensity of glasses with coexisting fractions of Ce 3+  and Ce 4+  species is found to be higher than that of a pure-Ce 3+ -containing glass with a lower  Z  eff  value. Values of total attenuation of each sample indicate that there is a non-linear correlation between the scintillation intensity and the product of total attenuation and  Q  eff . The obtained results illustrate the difficulty in understanding the luminescence induced by ionizing radiation, including the energy absorption and subsequent energy transfer. Our findings may provide a new approach for synthesizing novel scintillators by tailoring the local structure.

X-ray-induced Scintillation Governed by Energy Transfer Process in Glasses