Square column structure of high efficiency, reliable, uniformly flexible LED devices

Chih Hao Lin, Yung Min Pai, Chieh Yu Kang, Huang Yu Lin, Chun Fu Lee, Xin Yin Chen, Hsien Hao Tu, Jin Jia Yang, Cheng-Huan Chen, Chien-Chung Lin, Po-Tsung Lee, Chin Wei Sher*, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


This study demonstrates that flexible white LEDs, doped with diffusion particles and with a square column structure, have excellent luminosity, uniformity, and bending reliability. This large area (5 cm × 5 cm) square column flexible device had a smaller thickness (2 mm), and enhancements in both luminous efficiency (29.5%) and uniformity (44.6%) compared to the characteristics of the 6 mm reference sample. Optimization of the reflective layer coating for the square column, flexible white LED was achieved with a higher luminous efficiency (171 lm/w) and uniformity (92%). We designed a novel lightning bolt electrode to improve reliability and bendability. After the bending test, the blue flexible LED had a lower bending diameter (10 mm) but more bending circles (increased to 2000 times.

Original languageEnglish
Article number472
Issue number12
StatePublished - 1 Dec 2018


  • Flexible
  • Light emitting diodes
  • Optics


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