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Polymers 2017, 9(12), 648; https://doi.org/10.3390/polym9120648

Time Evolution of the Excimer State of a Conjugated Polymer Laser

1
Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
2
Research Chair on Laser Diagnosis of Cancers, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 11 November 2017 / Accepted: 22 November 2017 / Published: 27 November 2017
(This article belongs to the Special Issue Polymeric Materials for Optical Applications)
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Abstract

An excited dimer is an important complex formed in nano- or pico-second time scales in many photophysics and photochemistry applications. The spectral and temporal profile of the excimer state of a laser from a new conjugated polymer, namely, poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO), under several concentrations in benzene were investigated. These solutions were optically pumped by intense pulsed third-harmonic Nd:YAG laser (355-nm) to obtain the amplified spontaneous emission (ASE) spectra of a monomer and an excimer with bandwidths of 6 and 7 nm, respectively. The monomer and excimer ASEs were dependent on the PFO concentration, pump power, and temperature. Employing a sophisticated picosecond spectrometer, the time evolution of the excimer state of this polymer, which is over 400 ps, can be monitored. View Full-Text
Keywords: conjugated polymer (PFO); UV laser; amplified spontaneous emission spectra (ASE); time resolved study conjugated polymer (PFO); UV laser; amplified spontaneous emission spectra (ASE); time resolved study
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Mujamammi, W.M.; Prasad, S.; Saleh AlSalhi, M.; Masilamani, V. Time Evolution of the Excimer State of a Conjugated Polymer Laser. Polymers 2017, 9, 648.

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