NDLI: Visible- and uv-excited optically detected magnetic resonance (ODMR), ESR, and light-induced ESR (LESR) study of C/sub 60/ and C/sub 70/ films and glasses

Content Provider	IEEE Xplore Digital Library
Author	Lane, P.A. Shinar, J.
Copyright Year	1994
Description	Author affiliation: Iowa State University (Lane, P.A.)
Abstract	Summary form only given. The X-band ESR, LESR, and ODMR of C/sub 70/ molecules isolated in a toluene/polystyrene (C/sub 70/:T/PS) glassy matrix and C/sub 70/ films is compared to the ODMR of C/sub 60/ glasses and films. As in C/sub 60/:T/PS, the ODMR of the C/sub 70/ glasses consists only of a broad triplet exciton powder pattern at g /spl tilde/ 2; the half field resonance due to the /spl Delta/ = 2 transitions of this triplet is unobservable. In contrast to C/sub 60/:T/PS, the triplet powder pattern of C/sub 70/:T/PS is strikingly asymmetric, apparently due to the lower symmetry of C/sub 70/. The ODMR of C/sub 70/ films is also similar to that of C/sub 60/ films, and includes a narrow PL-enhancing polaron resonance (/spl Delta/H/sub 1/2/ /spl tilde/ 6 G) at g /spl tilde/ 2.0025 and narrow and broad triplet exciton powder patterns at full- and half-fields. The narrow triplet pattern, attributed to a triplet exciton delocalized over the entire molecule, is slightly narrrower than in C/sub 60/, consistent with a slightly larger exciton. The broad pattern observed in films but not in the glasses is similar to that observed in /spl pi/-conjugated polymers and is suspected to result from a triplet localized on a pentagon or hexagon adjacent to a neighboring molecule. While the half-field resonances are comparably intense in C/sub 60/, in C/sub 70/ the broad pattern is much weaker than the narrow (delocalized) exciton pattern. The effects of UV excitation, as well as UV-induced photopolymerization, will also be discussed.
Starting Page	205
Ending Page	205
File Size	83331
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835024
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic films Paramagnetic resonance Powders Excitons Laboratories Magnetic resonance Glass Optical detectors Polymer films Optical films
Content Type	Text
Resource Type	Article

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