High-efficiency LED COB device combined diced V-shaped pattern and remote phosphor
Zongtao Li, Huiyu Wang Huiyu Wang, Binhai Yu Binhai Yu, Xinrui Ding, and Yong Tang and Yong Tang · Chinese Optics Letters · 2017
To further improve the luminous efficiency of LED lightings, this Letter proposes a chip-on-board (COB) device by combining diced staggered V-shaped patterns and remote phosphors. The results show that the V-shaped patterned COB (V-COB) with vertex angles from 120o to 150o can achieve a ∼17% output power increase (OPI) compared to the conventional COB. V-COB remote phosphor devices (RPDs) are then manufactured and tested. The luminous efficiency of the proposed RPD represents an 11.6% increase at the correlated color temperature of ∼3000 K. Such an improvement can be attributed to both the decreases of total internal reflections and phosphor backscatterings.