Eu(￥2) Luminescence Phase-Modulation Spectroscopy as a Site-Selective Probe of Y Zeolite

摘要

Phase shift spectroscopy is applied to Eu(ゲ) luminescence from Eu3+-exchanged Y zeolite. The phase shift and intensity modulation of luminescence following intensity-modulated excitation are measured as a function of modulation frequency and they are fitted into a double exponential decay. The fast decay component, compared with the slow one, has narrower spectral bandwidth and is emitted from the Eu3+ that has more polar and definite environment with higher symmetry and that interacts more easily with hydrated water molecules. The fast decay component is attributed to Eu3+ at site ケ` while the slow one to Eu3+ at sites グ` and グ.