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