期刊名称：TELKOMNIKA (Telecommunication Computing Electronics and Control)
印刷版ISSN：2302-9293
出版年度：2020
卷号：18
期号：5
页码：2757-2763
DOI：10.12928/telkomnika.v18i5.13575
出版社：Universitas Ahmad Dahlan
摘要：The advantage in using a remote phosphor design in a WLED package is the superior luminous flux to that of the conformal and in-cup phosphor geometries. However, the disadvantage is its color quality which is lower than the results from the other two structures. This study suggests using two layers of phosphor for the remote phosphor configuration to improve the light chromaticity, including color rendering index (CRI) and color quality scale (CQS), for WLED packages with color temperature of 8500 K. The main concept of this research is to locate a green Y2O2S:Tb3 or red ZnS:Sn2 phosphor layer on the yellow YAG:Ce3 phosphor film, and then finding a suitable ZnS:Sn2 concentration to match the highest color quality. The results showed that ZnS:Sn2 brings great benefits to the increase of CRI and CQS. The greater the ZnS:Sn2 concentration is, the better the CRI and CQS become owing to the rise of red-light components in WLED packages. Meanwhile, the green Y2O2S:Tb3 phosphor brings benefits to the lumen output. However, a decrease in the luminescence and chromatic homogeneity appears when the concentrations of ZnS:Sn2 or Y2O2S:Tb3 exceed the corresponding level. This finding is verified by applying the Mie-scattering theory and the Lambert-Beer's law. The results of this article are important for the production of high-performance WLEDs in the modern lighting market.
