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Article Dans Une Revue Scientific Reports Année : 2023

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

Résumé

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.
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Origine : Publication financée par une institution

Dates et versions

hal-04184263 , version 1 (21-08-2023)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Quang-Khoi Nguyen, Benoit Glorieux, Gilles Sèbe, Tsung-Hsun Yang, Yeh-Wei Yu, et al.. Passive anti-leakage of blue light for phosphor-converted white LEDs with crystal nanocellulose materials. Scientific Reports, 2023, 13, pp.13039. ⟨10.1038/s41598-023-39929-2⟩. ⟨hal-04184263⟩
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