Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Abstract

The hue output for remote phosphor layout is still a concern for researchers and producers working on developing WLED devices since said layout proves inferior to the conformal or in-cup phosphor package. However, the luminous efficiency in the layout showed significant improvements. Thus, this study aims to achieve higher color quality accompanied by high lumen output for remote phosphor structures by using additional phosphor layers. Specifically, the study introduces the double-film and triple-film configurations in which the red and green phosphors were added. The best structure for WLED applications is determined by comparing these structures. The influences of each phosphor structure are investigated and examined on optical parameters of WLEDs, which have different correlated hue temperatures between 5600 K and 8500 K. The optical features are CRI, CQS, color deviation (CD), and photoluminescence (PL). The results demonstrate that the triple-layer structure improved the color quality more effectively than the dual-layer structure due to higher attained CRI and CQS and smaller DC figures. The hypothesis of Mie-scattering indicates that the enhancement of scattering in the triple-layer is responsible for these achievements. Thus, the findings of this study are reliable and valuable for manufacturers.

Keywords

• color quality
• color quality scale
• color rendering index
• luminous efficiency
• remote phosphor structure
• triple-layer phosphor structure
• wleds