Light manipulation for organic optoelectronics using bio-inspired moth's eye nanostructures

Lei Zhou, Qing-Dong Ou, Jing-De Chen, Su Shen, Jian-Xin Tang, Yan-Qing Li, Shuit Tong Lee

Research output: Contribution to journalArticleResearchpeer-review

120 Citations (Scopus)

Abstract

Organic-based optoelectronic devices, including light-emitting diodes (OLEDs) and solar cells (OSCs) hold great promise as low-cost and large-area electro-optical devices and renewable energy sources. However, further improvement in efficiency remains a daunting challenge due to limited light extraction or absorption in conventional device architectures. Here we report a universal method of optical manipulation of light by integrating a dual-side bio-inspired moth's eye nanostructure with broadband anti-reflective and quasi-omnidirectional properties. Light out-coupling efficiency of OLEDs with stacked triple emission units is over 2 times that of a conventional device, resulting in drastic increase in external quantum efficiency and current efficiency to 119.7% and 366 cd A-1 without introducing spectral distortion and directionality. Similarly, the light in-coupling efficiency of OSCs is increased 20%, yielding an enhanced power conversion efficiency of 9.33%. We anticipate this method would offer a convenient and scalable way for inexpensive and high-efficiency organic optoelectronic designs.

Original languageEnglish
Article number4040
Number of pages8
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 10 Feb 2014
Externally publishedYes

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