Chinese Optics Letters, 2017, 15 (4): 042301, Published Online: Jul. 25, 2018   

High-efficiency LED COB device combined diced V-shaped pattern and remote phosphor Download: 1252次

Author Affiliations
1 The Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510641, China
2 The Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720-5800, USA
Abstract
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.

Zongtao Li, Huiyu Wang, Binhai Yu, Xinrui Ding, Yong Tang. High-efficiency LED COB device combined diced V-shaped pattern and remote phosphor[J]. Chinese Optics Letters, 2017, 15(4): 042301.

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