OPTIMIZATION OF RING REMOTE PHOSPHOR STRUCTURE FOR LASER-BASED WHITE LIGHTING APPLICATIONS

Abstract

This study optimizes ring remote phosphor structures for laser-based white lighting applications; it delves into the pursuit of high-brightness and high-luminance lighting solutions that blue laser diodes (LDs) hold promising potential. Nonetheless, challenges arise from the use of conventional phosphor gel formulations--effective in white LEDs--as they tend to carbonize under focused laser irradiation: a problem we aim to mitigate. In order to tackle this issue, we investigate the ring remote phosphor structure as a potential method for guiding laser light from LDs towards adjacent phosphor layers; this strategy helps alleviate the negative impacts of concentrated laser irradiation. Utilizing ray-tracing simulations allows us to scrutinize and analyze the performance of our selected structure under different design parameters: notably, the half-angle of an inverted cone lens and the space between LD and encapsulant. Our findings underscore optimal setups that can achieve favorable lighting results while carefully balancing elements such as divergence and intensity. This research actively advances laser-based white lighting technology, thereby paving a path for superior.