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.
Highlights
Solid-state lighting is an efficient technology compared to conventional lighting methods, such as incandescent and fluorescent lamps, because of its energy saving properties such as high brightness, green energy, high reliability, low power consumption, and fast response time [1,2,3,4,5]
This study investigates the shape of a lightning bolt shaped electrode layout that improves the reliability and optical design, reduces the thickness and improves the uniformity of a high reflectivity substrate to enhance the efficiency of flexible LEDs
This study demonstrated the design of flexible LEDs with excellent luminosity, uniformity, and
Summary
Solid-state lighting is an efficient technology compared to conventional lighting methods, such as incandescent and fluorescent lamps, because of its energy saving properties such as high brightness, green energy, high reliability, low power consumption, and fast response time [1,2,3,4,5]. Novel materials such as reduced graphene oxide, nitride nanowires, and cellulose/epoxy have been reported [21,22,23] These flexible lighting enhancements offer excellent bending ability, the manufacturing processes are still very complicated. Our previous works on flexible LEDs were obtained through a combination of the flip-chip LED, silicone-based anisotropic conductive adhesive, and phosphor film [24]. This simple design is marred with some drawbacks, such as a large thickness (6 mm), poor reliability due to limited bending times, and bad reflectivity by green cove layer on the substrate. This study investigates the shape of a lightning bolt shaped electrode layout that improves the reliability (bending ability) and optical design (square column structure), reduces the thickness and improves the uniformity of a high reflectivity substrate to enhance the efficiency of flexible LEDs
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