<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The remote phosphor as a lighting structure has outstanding luminous efficiency compared to other options, such as conformal or in-cup. However, the lack of uniformity in distributed color has prevented remote phosphor from wider development. The answer to the chromatic performance enhancement that has been suggested by numerous researchers is the multi-layer configuration with two or three different types of chromatic phosphor. The research purpose is to select the best configuration for multi-chip white LEDs (WLEDs) to achieve optimal results in color quality scale (CQS), color rendering index (CRI), light output and color homogeneity. WLEDs mentioned in this paper have two distinct color temperatures, 6600 K and 7700 K. Experimental results show that the remote phosphor structure with three phosphor layers is superior in terms of color rendering, chromatic performance, and emitted light. The deviation of correlated color measured in this structure is also low, which means that the color uniformity is greatly enhanced in this multi-layer lighting structure. This result can be demonstrated by analyzing the scattering characteristics of the phosphoric layers using the Mie theory. The research findings have proven the effectiveness of the multi-phosphor configuration and can serve as a guideline to fabricate WLEDs with better performance.</p>
</abstract>

The remote phosphor as a lighting structure has outstanding luminous efficiency compared to other options, such as conformal or in-cup. However, the lack of uniformity in distributed color has prevented remote phosphor from wider development. The answer to the chromatic performance enhancement that has been suggested by numerous researchers is the multi-layer configuration with two or three different types of chromatic phosphor. The research purpose is to select the best configuration for multi-chip white LEDs (WLEDs) to achieve optimal results in color quality scale (CQS), color rendering index (CRI), light output and color homogeneity. WLEDs mentioned in this paper have two distinct color temperatures, 6600 K and 7700 K. Experimental results show that the remote phosphor structure with three phosphor layers is superior in terms of color rendering, chromatic performance, and emitted light. The deviation of correlated color measured in this structure is also low, which means that the color uniformity is greatly enhanced in this multi-layer lighting structure. This result can be demonstrated by analyzing the scattering characteristics of the phosphoric layers using the Mie theory. The research findings have proven the effectiveness of the multi-phosphor configuration and can serve as a guideline to fabricate WLEDs with better performance.

Triple-layer remote phosphor structure: a novel option for the enhancement of WLEDs’ color quality and luminous flux

Industrial University of Ho Chi Minh City

Faculty of Electrical and Electronics Engineering

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The remote phosphor as a lighting structure has outstanding luminous efficiency compared to other options, such as conformal or in-cup. However, the lack of...

Triple-layer remote phosphor structure: a novel option for the enhancement of WLEDs’ color quality and luminous flux

Published Online: Apr 13, 2021

Page range: 654 - 660

Received: Oct 23, 2018

Accepted: Apr 23, 2019

DOI: https://doi.org/10.2478/msp-2020-0076

Keywords
remote-phosphor, dual-layer phosphor, triple-layer phosphor, color rendering index, luminous efficacy, Miescattering theory

© 2019 My Hanh Nguyen Thi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Triple-layer remote phosphor structure: a novel option for the enhancement of WLEDs’ color quality and luminous flux

Published Online: Apr 13, 2021

Page range: 654 - 660

Received: Oct 23, 2018

Accepted: Apr 23, 2019

DOI: https://doi.org/10.2478/msp-2020-0076

Keywordsremote-phosphor, dual-layer phosphor, triple-layer phosphor, color rendering index, luminous efficacy, Miescattering theory

© 2019 My Hanh Nguyen Thi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
remote-phosphor, dual-layer phosphor, triple-layer phosphor, color rendering index, luminous efficacy, Miescattering theory