Journal
JOURNAL OF LUMINESCENCE
Volume 138, Issue -, Pages 122-128Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2013.01.031
Keywords
1-naphthoic acid; 2-naphthoic acid; Room temperature phosphorescence
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Funding
- UGC, New Delhi, India
- DRDO, New Delhi, India [DLS/81/4822/LSRB-180/ID/2009]
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In the present work we have investigated the luminescence properties of 1-naphthoic acid (1 NA) and 2-naphthoic acid (2NA) in three polymeric systems viz. poly methyl methacrylate (PMMA), poly vinyl alcohol (PVA) and cellulose acetate (CA). In case of PVA, strong room temperature phosphorescence (RTP) besides fluorescence is also noticed whereas in PMMA, weak phosphorescence is observed only after nitrogen purging and in CA it is practically not observed. Moreover, oxygen quenches the RIP in PVA significantly. Study reveals that in case of 1 NA in PVA, two types of species - strongly hydrogen bonded as well as weakly hydrogen bonded should exist. However, in PMMA and CA only weakly hydrogen bonded species appear to be present. On the other hand in case of 2NA we could not find such type of behaviour. The difference in the behaviour of these two probes is discussed. (C) 2013 Elsevier B.V. All rights reserved.
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