Anthraquinones are a class of organic dyes with a wide range of uses in optical devices that require intensities
above the damage threshold for operation. It has been demonstrated that some anthraquinones doped into
(poly)methyl methacrylate(PMMA) demonstrate the novel effect of self healing. One theory of decay and self
healing is photocharge ejection and recombination. Using digital imaging we probe the electric field dependent
decay and recovery of the anthraquinone disperse orange 11(DO11) doped into PMMA. We find that the electric
field works to mitigate decay and improves recovery, as well as find that for large fields the sample appears to
recover beyond 100%.
One of the limiting factors of optical devices for space applications is photodamage from high intensity light
and radiation. Dye doped polymers offer many advantages in device design but are susceptible to photodamage,
especially due to high intensity UV radiation. Several organic dyes have been observed to self heal after photodegradation. We seek to understand the underlying mechanism with the goal of designing materials that are
more robust to photodegradation. We test the hypothesis that photodegradation is due to charge injection into
the polymer and healing due to recombination using photoconductivity and imaging measurements of disperse
orange 11(DO11) doped into PMMA.
The photodegradation and recovery process in anthraquinone chromophores have been characterized using am plified spontaneous emission (ASE) in several Anthraquinone derivatives doped in poly(methyl methacrylate) (PMMA). To understand the mechanisms of self healing in disperse orange 11 (DOll) doped in PMMA and the role of the host polymer, we investigated reversible photodegradation in DOll doped in copolymer composed of different percentages of methyl methacrylate (MMA) and Styrene. The results suggest that the host polymer is an important factor in determining the distribution of domain sizes of dye molecules.
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