Optical switching of a photochromic bis-phenylazo compound in PMMA films |
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| Authors: | Maria Cristina Larciprete Danilo Dini Raffaella Ostuni Concita Sibilia Mario Bertolotti Xavier Alvarez-Mico Rafael Gomez-Bombarelli Mirko Cappeddu Michael Scalora Mark J Bloemer |
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| Affiliation: | (1) INFM, Department of Energetics, University of Rome “La Sapienza”, Via A. Scarpa 16, 00161 Roma, Italy;(2) Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tubingen, Germany;(3) AMSRD-WS-ST Charles M. Bowden Research Center, Bldg. 7804 Redstone Arsenal, Hunstsville, AL 35898-5000, USA |
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| Abstract: | We present our results on a newly synthesized bis-phenylazo derivative, namely bisperfluoroalkylsulfonylamino- arylazomethylene-triphenyl-phosphorane
(BAM-TPP). Thin films of BAM-TPP in polymethylmethacrylate (PMMA) matrix were prepared. The films (thickness, d < 60 μm) were exposed to UV-vis light with variable intensity in order to stimulate the photochromic reaction of BAM-TPP.
The resulting absorption changes of the BAM-TPP/PMMA films were investigated by spectrophotometry. The absorption spectra
reveal that BAM-TPP molecules in PMMA undergo photoisomerization with resulting decrease of absorbance in the range 500–700 nm.
Finally, the time response of film transmittance at 514 nm under increasing CW light intensity was recorded, showing that
the reverse photochromic process brings the absorbance back to its pristine value. The obtained films thus proved to be suitable
for optical switching applications.
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