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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.