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Coherent Random Lasing in Colloidal Quantum Dot-Doped Polymer-Dispersed Liquid Crystal with Low Threshold and High Stability
journal contribution
posted on 2020-01-16, 20:53 authored by Zhiwen Wang, Mingxuan Cao, Genrong Shao, Zhikun Zhang, Huiwen Yu, Yeqing Chen, Yating Zhang, Yang Li, Baiping Xu, Ying Wang, Jianquan YaoHigh-concentration
(2–10 wt %) ZnCdSeS/ZnS alloyed quantum
dot-doped polymer-dispersed liquid crystals
(QD-PDLCs)
were prepared via ultraviolet (UV) curing. The QD-PDLC morphology
and resonance characteristics of a coherent random laser were investigated.
The doping concentration of the liquid crystal and quantum dots was
varied to investigate its effect on the lasing threshold, line width,
and stability with respect to the density and grain size of the liquid
crystal droplets inside the PDLC structure. Furthermore, the QD-PDLC
laser performance was influenced by the pump position and area because
of spatial localization of the random resonators. Moreover, the QD-PDLC
showed good long-term stability; after 15 days of laser excitation
(3 h/day), the laser output was maintained at 92% of the original
emission intensity. The random laser threshold was as low as 50 μJ/cm2 with the optimized preparation process, which suggested strong
potential for applications in polymer random fiber lasers, sensors,
and displays.
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15 daysLow ThresholdPDLC structuredoping concentrationemission intensitylasing thresholdlaser outputresonance characteristicslaser thresholdfiber lasersUVcrystal dropletsoptimized preparation processQD-PDLC laser performanceline widthquantum dotsQD-PDLC morphologyColloidal Quantum Dot-Doped Polymer-Dispersed Liquid Crystalgrain sizeCoherent Random Lasing
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