Enhancement of photochromic hologram thermal stability |
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Authors: | Yu Boiko |
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Affiliation: | (1) YBBR, Inc., 275 Romulus Private, Ottawa, ON, K1K 3Y2, Canada |
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Abstract: | Significant enhancement of the thermal stability of the hologram recorded on photochromic materials had been achieved via
covalent bonding of the photochromic dye to the polymer matrix as compared to the host-guest systems. One time partial reduction
of the hologram’s initial diffraction efficiency due to thermal exposure was observed for both—polymers with attached dye
as well as hostguest materials. Such one time reduction is interpreted to be due to the thermal relaxation of the polymer
network induced with photochromic transition in the dye molecule. A gradual hologram erasure at elevated temperatures was
observed for the host-guest system, which is assumed to be due to dye’s diffusion between highly lit and dark areas. For the
photochromic materials with covalent boding of the dye to the polymer matrix the level of thermal stability is demonstrated
such that at temperatures ca. 100C there was no detectable diffusion type degradation of the hologram after 6 hours of exposure
to elevated temperature. Same heating of the hologram in photochromic host-guest polymer led to a full hologram erasure within
40 minutes. In both cases the one time initial DE reduction due to polymer matrix relaxation at elevated temperatures had
comparable value of about 0.5 of hologram’s initial DE.
The article is published in the original. |
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Keywords: | photochromic hologram volume hologram thermochromism diarylethene dye doped polymer host-guest thermal stability |
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