Enhancement of color quality scale and luminous flux of white LEDs with remote phosphor geometries

In comparison with the conformal phosphor or in-cup phosphor structure, remote phosphor structure has a superior luminous flux whereas its color quality is inferior to the others'. Due to this drawback, it is essential to conduct experiments to find the solution for the improvement of the color quality of WLEDs using remote phosphor structure. In this study, a dual-layer remote phosphor structure that is capable of enhancing the color rendering index (CRI) and color quality (CQS) for WLEDs was proposed. Three kinds of WLEDs with similar structures but different color temperatures varying at 5600 K, 7000 K, and 8500 K are used in this article. The mission of this paper is to place a yellow-green emitting SrBaSiO 4 :Eu 2+ phosphor layer or a red-emitting Sr w F x B y O z :Eu 2+ , Sm 2+ phosphor layer on the YAG:Ce 3+ phosphor layer and then select the most appropriate value of Sr w F x B y O z :Eu 2+ , Sm 2+ concentration to get the greatest color quality. Experimental results were exactly as expected since Sr w F x B y O z :Eu 2+ , Sm 2+ really succeeded in increasing CRI and CQS. Specifically, the larger the Sr w F x B y O z :Eu 2+ , Sm 2+ concentration, the higher the CRI and CQS, resulting from the increase of the red light component in WLEDs. Meanwhile, the quality degree of luminous flux depends tightly on the SrBaSiO 4 :Eu 2+ phosphor layer. However, if the Sr w F x B y O z :Eu 2+ , Sm 2+ and SrBaSiO 4 :Eu 2+ concentration exceeds, the luminous flux and color quality will have a tendency to drop off, according to the theory of Mie scattering and the Lambert-Beer law. The result of this paper is a valuable reference in the production of high-quality WLEDs.