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

doi:10.3390/cryst8120472

Crystals (Dec 2018)

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

Affiliations

Chih-Hao Lin: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Yung-Min Pai: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Chieh-Yu Kang: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Huang-Yu Lin: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Chun-Fu Lee: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Xin-Yin Chen: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Hsien-Hao Tu: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Jin-Jia Yang: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Cheng-Huan Chen: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Chien-Chung Lin: Institute of Photonic System, College of Photonics, National Chiao Tung University, Tainan 711, Taiwan
Po-Tsung Lee: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Chin-Wei Sher: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Hao-Chung Kuo: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan

DOI: https://doi.org/10.3390/cryst8120472
Journal volume & issue: Vol. 8, no. 12
p. 472

Abstract

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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.

Published in Crystals

ISSN: 2073-4352 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Crystallography
Website: http://www.mdpi.com/journal/crystals/

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