Phosphors-conversion white light LEDs with an omni-directional reflector

Sian-Wei Chen; Jung-Chieh Su; Chun-Lin Lu; Siao-Fang Song; Jing-Heng Chen

doi:10.1117/12.818084

18 November 2008 Phosphors-conversion white light LEDs with an omni-directional reflector

Sian-Wei Chen; Jung-Chieh Su; Chun-Lin Lu; Siao-Fang Song; Jing-Heng Chen

Author Affiliations +

Proceedings Volume 7138, Photonics, Devices, and Systems IV; 71382D (2008) https://doi.org/10.1117/12.818084
Event: Photonics, Devices, and Systems IV, 2008, Prague, Czech Republic

Abstract

To achieve high luminescence white LEDs by UV excited phosphors, this research work presents theoretical results to demonstrate a novel white light LED structure and performance. The main purpose of our work is to solve two issues encountered, one is UV leak and another is low conversion efficiency of phosphors. A photonic crystal or an omnidirectional reflector (ODR) can be used to achieve this goal, as compared with a distributed Bragg reflector (DBR). The advantage of the ODR is that the UV light beam at any incidence can be omni-directionally reflected. In this study, a UV LED with a 380-nm wavelength with RGB phosphors and a photonic crystal with specific function were used. This novel white LED was constructed with an air gap between the phosphors layer and the ODR. Theoretical simulation study shows that the ODR will enhance the white light generation and prevent UV leak from the device. Theoretical simulation shows that a white light LED with an air gap located between the phosphors layer and ODR will have better performance than that without it. The simulation data shows that an ODR is the optimized way to reduce UV leak.

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Sian-Wei Chen, Sian-Wei Chen, Jung-Chieh Su, Jung-Chieh Su, Chun-Lin Lu, Chun-Lin Lu, Siao-Fang Song, Siao-Fang Song, Jing-Heng Chen, Jing-Heng Chen, } "Phosphors-conversion white light LEDs with an omni-directional reflector", Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71382D (18 November 2008); doi: 10.1117/12.818084; https://doi.org/10.1117/12.818084

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