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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium

Cited 19 times inthomson ciCited 17 times inthomson ci
Title
Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium
Author
Mowatt, CarrieMorris, Stephen M.Song, Myoung HoonWilkinson, Timothy D.Friend, Richard H.Coles, Harry J.
Keywords
Chiral nematic liquid crystals; Dye concentration; Emission characteristics; Fluorescence lifetimes; Gain medium; High slope efficiency; Laser dyes; Liquid crystal host; Liquid-crystal lasers; Long wavelength; Low thresholds; Molar extinction coefficient; Nematic hosts; Optically pumped; Photonic band edge lasers; Photonic bands; Pyrromethene; Slope efficiencies; Spectral properties; Threshold energy
Issue Date
201002
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.107, no.4, pp.043101 -
Abstract
The primary concern of this work is to study the emission characteristics of a series of chiral nematic liquid crystal lasers doped with different laser dyes (DCM, pyrromethene 580, and pyrromethene 597) at varying concentrations by weight (0.5-2 wt %) when optically pumped at 532 nm. Long-wavelength photonic band-edge laser emission is characterized in terms of threshold energy and slope efficiency. At every dye concentration investigated, the pyrromethene 597-doped lasers exhibit the highest slope efficiency (ranging from 15% to 32%) and the DCM-doped lasers the lowest (ranging from 5% to 13%). Similarly, the threshold was found to be, in general, higher for the DCM-doped laser samples in comparison to the pyrromethene-doped laser samples. These results are then compared with the spectral properties, quantum efficiencies and, where possible, fluorescence lifetimes of the dyes dispersed in a common nematic host. In accordance with the low thresholds and high slope efficiencies, the results show that the molar extinction coefficients and quantum efficiencies are considerably larger for the pyrromethene dyes in comparison to DCM, when dispersed in the liquid crystal host.
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DOI
http://dx.doi.org/10.1063/1.3284939
ISSN
0021-8979
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