Wavelength dependence of reversible photodegradation of disperse orange 11 dye-doped PMMA thin films

Abstract

Using transmittance imaging microscopy we measure the wavelength dependence of reversible photodegradation in disperse orange 11 (DO11) dye-doped (poly)methyl-methacrylate (PMMA). The reversible and irreversible inverse quantum efficiencies (IQEs) are found to be constant over the spectral region investigated, with the average reversible IQE being ${\overline{B}}_{\alpha }=8.70(\pm 0.38)\times 10^5$ and the average irreversible IQE being ${\overline{B}}_{\epsilon }=1.396(\pm 0.031)\times 10^8$. The large difference between the IQEs is hypothesized to be due to the reversible decay channel being a direct decay mechanism of the dye, while the irreversible decay channel is an indirect mechanism, with the dye first absorbing light, then heating the surrounding environment causing polymer chain scission and cross linking. Additionally, the DO11/PMMA's irreversible IQE is found to be among the largest of those reported for organic dyes, implying that the system is highly photostable. We also find that the recovery rate is independent of wavelength, with a value of $\overline{\beta }=3.88(\pm 0.47)\times 10^{-3}$ min${}^{-1}$. These results are consistent with the correlated chromophore domain model of reversible photodegradation.

9 pages, 7 Figures

References in corpus (8)

• Mechanisms of reversible photodegradation in disperse orange 11 dye doped in PMMA polymer
• Self-healing organic-dye-based random lasers
• Two-photon fluorescence measurements of reversible photodegradation in a dye-doped polymer
• A Self Healing Model Based on Polymer-Mediated Chromophore Correlations
• Generalizing the correlated chromophore domain model of reversible photodegradation to include the effects of an applied electric field
• The influence of an electric field on photodegradation and self healing in disperse orange 11 dye-doped PMMA thin films
• The effect of pump depletion on reversible photodegradation
• Mechanisms of the refractive index change in DO11/PMMA due to photodegradation

Cited by in corpus (2)

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