Improvement of Light Extraction From Patterned Polymer Encapsulated GaN-Based Flip-Chip Light-Emitting Diodes by Imprinting

@article{Bao2007ImprovementOL,
  title={Improvement of Light Extraction From Patterned Polymer Encapsulated GaN-Based Flip-Chip Light-Emitting Diodes by Imprinting},
  author={Kangkang Bao and Xiang Ning Kang and Bei Zhang and Tao Dai and Chang Min Xiong and Hang Ji and Guo Yi Zhang and Yong Chen},
  journal={IEEE Photonics Technology Letters},
  year={2007},
  volume={19},
  pages={1840-1842}
}
To improve surface light extraction of GaN-based flip-chip light-emitting diodes (FC-LEDs), we employed an imprint approach of thermosetting polymer for patterning microscale surface grating on the polymer encapsulant. One-dimensional (1-D) and two-dimensional (2-D) taper-like polymer gratings with a period of 6 mum were successfully realized on encapsulant above the sapphire backplane of GaN LED. By adopting the 1-D and 2-D taper-like grating encapsulant, the improvement of light extraction… CONTINUE READING

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