Passive anti-leakage of blue light for phosphor-converted white LEDs with crystal nanocellulose materials

Quang Khoi Nguyen, Benoit Glorieux, Gilles Sebe, Tsung Hsun Yang, Yeh Wei Yu, Ching Cherng Sun

研究成果: 雜誌貢獻期刊論文同行評審

摘要

A phenomenon known as "blue-light leakage" caused by overheating pcW-LEDs has recently been identified, and it poses a risk to users. This study focuses on investigating and optimizing a solution to address this issue. To tackle the problem of overheating and blue light leakage, we explored the application of a specific thermochromic material called crystal nano cellulose (CNC). We introduced CNC inside the epoxy lens of white LEDs. Importantly, under standard conditions, CNC has a negligible impact on the optical properties of the output white light. However, when overheating conditions arise, leading to blue light leakage, the temperature increase triggers a darkening effect in CNC. This thermochromic behavior of CNC allows it to strongly absorb the blue light, resulting in a significant suppression of the output luminous flux. As a result, the lamp dims, which not only prevents the user's eyes from being exposed to harmful bluish light but also serves as an indicator of aging in the pcW-LED. By implementing CNC as a responsive material in the design of white LEDs, this study offers a practical and effective solution to mitigate the negative effects of blue-light leakage caused by overheating. This improvement enhances the safety and comfort of users while also providing an early warning system for the aging of pcW-LEDs.

原文???core.languages.en_GB???
文章編號13039
期刊Scientific Reports
13
發行號1
DOIs
出版狀態已出版 - 12月 2023

指紋

深入研究「Passive anti-leakage of blue light for phosphor-converted white LEDs with crystal nanocellulose materials」主題。共同形成了獨特的指紋。

引用此