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Resolution of Ultrafast Pyrene Excimer Emission Rise Times in Zeolites X and Y †
Author(s) -
Cheng Karen A. W. Y.,
Schepp Norman P.,
Cozens Frances L.
Publication year - 2006
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/2005-06-07-ra-565
Subject(s) - excimer , pyrene , ultrashort pulse , resolution (logic) , chemistry , photochemistry , materials science , analytical chemistry (journal) , fluorescence , environmental chemistry , optics , physics , organic chemistry , laser , computer science , artificial intelligence
Pyrene has been a favorite photophysical probe molecule for zeolite research because of its ability to exhibit both monomer and excimer emission upon excitation. This study combines the use of ultrafast time‐resolved fluorescence spectroscopy with steady‐state fluorescence spectroscopy to study the excimer emission of pyrene incorporated within zeolites LiY, NaY, KY and NaX. The effects of sealing technique and coincorporated solvents are also explored. Pyrene excimer emission is resolv‐able with the use of an ultrafast streak camera under all conditions examined in this study with a rise‐time range of 6.8 to 16.0 picoseconds. For each zeolite sample the addition of cosolvents decreases the rise time, with a greater decrease for polar solvents than for a nonpolar solvent. The presence of a detectable rise time for excimer emission indicadtes that pyrene excimer formation is a dynamic process when pyrene is embedded within the cavities of zeolite host materials.