Low-Threshold Whispering Gallery Mode Lasing from Self-Assembled Microspheres of Single-Sort Conjugated Polymers
Low-Threshold Whispering Gallery Mode Lasing from Self-Assembled Microspheres of Single-Sort Conjugated Polymers
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DOI：
10.1002/adom.201700123
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发表时间：
2017-05-17
影响因子：
9
通讯作者：
Yamamoto, Yohei
中科院分区：
文献类型：
--
作者：
Kushida, Soh;Okada, Daichi;Yamamoto, Yohei
低阈值有机微激光器是先进的光学应用，如纳米/微米级存储器，传感和通信工具的需求，并进一步为未来的电驱动激光器的应用价值。在本文中，它表明，各种高荧光共轭聚合物自组装形成单组分微球，表现出，飞秒泵浦到一个单一的微球，回音壁模式（WGM）激光与蓝色，绿色，红色的发射颜色。特别是由聚芴组成的微球显示出低至1.5 μ J cm（-2）的最低阈值注量和对>10（5）脉冲连续泵浦的高光稳定性。通过将微球安装在Ag涂覆的衬底上，其中Ag层的镜面效应提高了光致发光限制的效率，而等离子体近场的影响较小，阈值通量进一步降低了四分之一（0.37 μ J cm（-2））。考虑到本征电荷注入和输运特性，p共轭聚合物微球谐振器将是电泵浦WGM发光的可能材料。
Low-threshold organic microlasers are demanded for advanced optical applications such as nano/micrometer scale memory, sensing, and communication tools, and further valuable for future electrically driven laser applications. In this paper, it is demonstrated that various highly fluorescent conjugated polymers self-assemble to form single-component microspheres that exhibit, upon femtosecond pumping to a single microsphere, whispering gallery mode (WGM) lasing with blue, green, and red emission colors. In particular, the microsphere consisting of polyfluorene shows the lowest threshold fluence as low as 1.5 mu J cm(-2) and high photostability against successive pumping of >10(5) pulse. The threshold fluence is further reduced by one fourth (0.37 mu J cm(-2)) by mounting the microspheres on an Ag-coated substrate, where a mirror effect of the Ag layer enhances efficiency of the photoluminescence confinement with a minor effect of plasmonic near-field. Considering the intrinsic charge injection and transport properties, p-conjugated polymer microsphere resonators will be possible materials for electrically pumped WGM luminescence.