Biologically Inspired Organic Light-Emitting Diodes
Biologically Inspired Organic Light-Emitting Diodes
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DOI：
10.1021/acs.nanolett.5b05183
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发表时间：
2016-05-01
期刊：
影响因子：
10.8
通讯作者：
Jeong, Ki-Hun
中科院分区：
文献类型：
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作者：
Kim, Jae-Jun;Lee, Jaeho;Jeong, Ki-Hun
许多动物物种使用高度显著的特征作为成功交配的求偶信号。萤火虫利用它们的生物发光作为视觉求爱信号。除了有效的生物发光外，萤火虫灯笼的结构组件也有助于增强明显的光学信号。最近，这些萤火虫灯笼超微结构引起了人们的极大兴趣，并激发了高效的光管理方法。在这里，我们报告中发现的萤火虫（Pyrocoelia rufa）和他们的生物学灵感的高效有机发光二极管（OLED）的应用程序的独特的光学功能的分层超微结构。的分层结构是由纵向纳米结构和不对称的微观结构，这是成功地复制使用几何形状引导的抗蚀剂回流，复制成型，和聚二甲基硅氧烷（PDMS）氧化。生物启发OLED的外部量子效率（EQE）提高了高达61%。生物启发的OLED清楚地显示出具有宽视角的侧面增强的超朗伯发射。高效的光提取和广角照明表明，分层结构可能如何提高萤火虫光学求偶信号在广角范围内的识别。同时，生物启发的设计为设计用于照明或显示应用的功能性光学表面提供了新的范例。
Many animal species employ highly conspicuous traits as courtship signals for successful mating. Fireflies utilize their bioluminescent light as visual courtship signals. In addition to efficient bioluminescent light emission, the structural components of the firefly lantern also contribute to the enhancement of conspicuous optical signaling. Recently, these firefly lantern ultrastructures have attracted much interest and inspired highly efficient light management approaches. Here we report on the unique optical function of the hierarchical ultrastructures found in a firefly (Pyrocoelia rufa) and their biological inspiration of highly efficient organic light-emitting diode (OLED) applications. The hierarchical structures are comprised of longitudinal nanostructures and asymmetric microstructures, which were successfully replicated using geometry-guided resist reflow, replica molding, and polydimethylsiloxane (PDMS) oxidation. The external quantum efficiency (EQE) of the bioinspired OLEDs was enhanced by up to 61%. The bioinspired OLEDs clearly showed side-enhanced super-Lambertian emission with a wide-viewing angle. The highly efficient light extraction and wide-angle illumination suggest how the hierarchical structures likely improve the recognition of firefly optical courtship signals over a wide-angle range. At the same time, the biologically inspired designs provide a new paradigm for designing functional optical surfaces for lighting or display applications.