Biologically Inspired Organic Light-Emitting Diodes

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2016-05
Language
English
Article Type
Article
Keywords

PLASMA OXIDATION; QUANTUM YIELD; BIOLUMINESCENCE; INTERFERENCE; IRIDESCENCE; EFFICIENCY; FIREFLIES

Citation

NANO LETTERS, v.16, no.5, pp.2994 - 3000

ISSN
1530-6984
DOI
10.1021/acs.nanolett.5b05183
URI
http://hdl.handle.net/10203/209521
Appears in Collection
EE-Journal Papers(저널논문)BiS-Journal Papers(저널논문)
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