Bio-Inspired Flexible Fluoropolymer Film for All-Mode Light Extraction Enhancement

Renli Liang, Run Hu, Hanling Long, Xinyu Huang, Jiangnan Dai*, Linlin Xu, Lei Ye, Tianyou Zhai, Hao-Chung Kuo, Changqing Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Enhancing the light extraction efficiency is a prevalent but vital challenge for most solid-state lighting technologies, especially for deep ultraviolet light-emitting diodes (DUV-LEDs). In this paper, inspired by the microstructure of the butterfly's eye, we propose and fabricate a flexible fluoropolymer film (FFP film) to tackle this issue for all-mode, full-wavelength light extraction enhancement for most solid-state lighting technologies compatibly. The experimental results demonstrate that compared with one mounted with a smooth FFP film, the light output power of DUV-LED is enhanced up to 26.7% by mounting the FFP film with 325 nm radius nanocones at a driving current of 200 mA. Importantly, thanks to the super-flexible feature of the FFP film, it can both cover the top surface and sidewalls of the DUV-LED chip, leading to the improvement of transverse electric and transverse magnetic mode light extraction by 20.5 and 21.8%, respectively. Finite element analysis (FEA) simulations of the electric field distribution of DUV-LEDs with the FFP film reveal the underlying physics. The present strategy is proposed from the view of the packaging level, which is cost-effective, able to be manufactured at a large scale, and compatible with the solid-state lighting technologies.

Original languageEnglish
Pages (from-to)19623-19630
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number21
DOIs
StatePublished - 29 May 2019

Keywords

  • TE/TM mode
  • deep ultraviolet light emitting diode
  • flexible fluoropolymer
  • light extraction efficiency
  • nanostructures

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