Abstract
Improving lighting performance of WLEDs, especially the color quality, has always been a priority in lighting researches. Recently, the conventional remote phosphor configuration is unable to fulfill the needs of the modern lighting market, particularly the high color expression demand has inspired the search for a novel manufacturing procedure. In this study, based on the results from previous studies, the struggles in enhancing lighting performances are pointed out, and a solution, the dual-layer remote phosphor, is proposed from our conducted experiments. Through experiments with NaYF4:Er3+;Yb3+ and Mg2TiO4:Mn4+ phosphors, the dual-layer phosphor is proven to be effective in improving lighting properties such as color rendering index (CRI) and color quality scale (CQS). The research method involves structuring and experimenting with the phosphor configuration of the yellow phosphor YAG:Ce3+ layer with a green NaYF4:Er3+;Yb3+ or a red Mg2TiO4:Mn4+ phosphor layer whose phosphor concentrations are varied. The results show that the red phosphor Mg2TiO4:Mn4+ particles benefit the CRI and CQS because the values of CRI and CQS increase with red phosphor Mg2TiO4:Mn4+ concentration. On the other hand, the green phosphor NaYF4:Er3+;Yb3+ is inferior in improving CRI and CQS but exhibits better luminous flux. Despite being useful in enhancing lighting performance, the phosphor concentration must be kept below a certain level, which will be mentioned in the article, to prevent damages. These results are verified using Mie scattering theory and Lambert-Beer's law and can be utilized in producing WLEDs with high lighting quality. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
Highlights
The phosphor converted white light emitting diodes have received increasing attention in recent time and been gradually replacing the other lighting solutions [1]
The most common method to fabricate white light is to mix the blue light from the LED chip with red light components from the red phosphor and the yellow light from yellow phosphor; the arrangement of components in a WLED is crucial to the generated white light as it can inuence the luminous ecacy and color rendering index [4]-[8]
The color rendering index (CRI) indicates the WLED ability of depicting a color when there are energy ows through, and CRI becomes an important criterion for WLED
Summary
The phosphor converted white light emitting diodes (pc-WLEDs) have received increasing attention in recent time and been gradually replacing the other lighting solutions [1]. The correlated color temperature throughout all experiments is kept at the intended level, and the purpose is to verify the eectiveness of green phosphor NaYF4:Er3+,Yb3+ in enhancing luminous ux and red phosphor Mg2TiO4:Mn4+ in promoting CRI and CQS.
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