Journal article
Photodegradation and self-healing in a Rhodamine 6G dye and Y2O3 nanoparticle-doped polyurethane random laser
Applied physics. B, Lasers and optics, Vol.120(1), pp.1-12
07/01/2015
Abstract
One of the fundamental difficulties in implementing organic dyes in random lasers is irreversible photodegradation of the dye molecules, leading to loss of performance and the need to replace the dye. We report the observation of self-healing after photodegradation in a Rhodamine 6G dye and nanoparticle-doped polyurethane random laser. During irradiation, we observe two distinct temporal regions in which the random lasing emission first increases in intensity and redshifts, followed by further redshifting, spectral broadening, and decay in the emission intensity. After irradiation, the emission intensity is found to recover back to its peak value, while still being broadened and redshifted, which leads to the result of an enhancement of the spectrally integrated intensity. We also perform IR-VIS absorbance measurements and find that the results suggest that during irradiation, some of the dye molecules form dimers and trimers and that the polymer host is irreversibly damaged by photooxidation and Norrish type I photocleavage.
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Details
- Title
- Photodegradation and self-healing in a Rhodamine 6G dye and Y2O3 nanoparticle-doped polyurethane random laser
- Creators
- Benjamin R. Anderson - Washington State UniversityRay Gunawidjaja - Washington State UniversityHergen Eilers - Washington State University
- Publication Details
- Applied physics. B, Lasers and optics, Vol.120(1), pp.1-12
- Academic Unit
- Institute for Shock Physics
- Publisher
- Springer Nature
- Number of pages
- 12
- Grant note
- HDTRA1-13-1-0050 / Defense Threat Reduction Agency; United States Department of Defense
- Identifiers
- 99900876941001842
- Language
- English
- Resource Type
- Journal article