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Coherent Random Lasing in Colloidal Quantum Dot-Doped Polymer-Dispersed Liquid Crystal with Low Threshold and High Stability.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-16 , DOI: 10.1021/acs.jpclett.9b03409 Zhiwen Wang 1 , Mingxuan Cao 1, 2 , Genrong Shao 3 , Zhikun Zhang 3 , Huiwen Yu 1, 2 , Yeqing Chen 4 , Yating Zhang 5 , Yang Li 3 , Baiping Xu 1, 2 , Ying Wang 1 , Jianquan Yao 5
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-16 , DOI: 10.1021/acs.jpclett.9b03409 Zhiwen Wang 1 , Mingxuan Cao 1, 2 , Genrong Shao 3 , Zhikun Zhang 3 , Huiwen Yu 1, 2 , Yeqing Chen 4 , Yating Zhang 5 , Yang Li 3 , Baiping Xu 1, 2 , Ying Wang 1 , Jianquan Yao 5
Affiliation
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High-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.
中文翻译：
低阈值和高稳定性的胶体量子点掺杂聚合物分散液晶中的相干随机激射。
通过紫外（UV）固化制备高浓度（2-10wt％）的ZnCdSeS / ZnS合金量子点掺杂的聚合物分散液晶（QD-PDLC）。研究了相干随机激光器的QD-PDLC形态和共振特性。改变液晶和量子点的掺杂浓度以研究其对激光阈值，线宽和相对于PDLC结构内液晶滴的密度和晶粒尺寸的稳定性的影响。此外，由于随机谐振器的空间定位，QD-PDLC激光器的性能受到泵浦位置和面积的影响。而且，QD-PDLC具有良好的长期稳定性。激光激发15天后（3小时/天），激光输出保持在原始发射强度的92％。
更新日期：2020-01-17
中文翻译：
低阈值和高稳定性的胶体量子点掺杂聚合物分散液晶中的相干随机激射。
通过紫外（UV）固化制备高浓度（2-10wt％）的ZnCdSeS / ZnS合金量子点掺杂的聚合物分散液晶（QD-PDLC）。研究了相干随机激光器的QD-PDLC形态和共振特性。改变液晶和量子点的掺杂浓度以研究其对激光阈值，线宽和相对于PDLC结构内液晶滴的密度和晶粒尺寸的稳定性的影响。此外，由于随机谐振器的空间定位，QD-PDLC激光器的性能受到泵浦位置和面积的影响。而且，QD-PDLC具有良好的长期稳定性。激光激发15天后（3小时/天），激光输出保持在原始发射强度的92％。
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