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Crystals 2018, 8(12), 472; https://doi.org/10.3390/cryst8120472

Square Column Structure of High Efficiency, Reliable, Uniformly Flexible LED Devices

1
Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
2
Institute of Photonic System, College of Photonics, National Chiao Tung University, Tainan 711, Taiwan
3
Fok Ying Tung Research Institute, Hong Kong University of Science and Technology, Hong Kong, China
*
Authors to whom correspondence should be addressed.
Received: 2 December 2018 / Accepted: 13 December 2018 / Published: 16 December 2018
(This article belongs to the Special Issue GaN-Based Optoelectronic Materials and Light Emitting Devices)
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Abstract

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. View Full-Text
Keywords: optics; light emitting diodes; flexible optics; light emitting diodes; flexible
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Lin, C.-H.; Pai, Y.-M.; Kang, C.-Y.; Lin, H.-Y.; Lee, C.-F.; Chen, X.-Y.; Tu, H.-H.; Yang, J.-J.; Chen, C.-H.; Lin, C.-C.; Lee, P.-T.; Sher, C.-W.; Kuo, H.-C. Square Column Structure of High Efficiency, Reliable, Uniformly Flexible LED Devices. Crystals 2018, 8, 472.

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