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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 19, Number 4
BKCSDE 19(4)
April 20, 1998 

Eu(Ⅲ) Luminescence Phase-Modulation Spectroscopy as a Site-Selective Probe of Y Zeolite
Hanshin Hwang, Sunbae Lee, Du-Jeon Jang*
Phase shift spectroscopy is applied to Eu(Ⅲ) 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 Ⅱ' while the slow one to Eu3+ at sites Ⅰ' and Ⅰ.
471 - 475
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