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2 October 2024 Anti‑leakage of blue light for phosphor‑converted white LEDs with nano cellulose
Ching-Cherng Sun, Chih-Hung Chen, Quang‑Khoi Nguyen, Benoît Glorieux, Tsung-Hsun Yang, Chi-Shou Wu, Yeh-Wei Yu
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Proceedings Volume PC13131, Current Developments in Lens Design and Optical Engineering XXV; PC1313106 (2024) https://doi.org/10.1117/12.3028744
Event: Optical Engineering + Applications, 2024, San Diego, California, United States
Abstract
In this paper, we present our investigation into the prevention of blue-light leakage in phosphor-converted white LEDs through a passive approach. Our study primarily focuses on the application and optimization of a specific thermochromic material known as Crystal Nano Cellulose (CNC). We integrated CNC within the epoxy lens of white LEDs. Importantly, under normal operating conditions, CNC minimally affects the optical properties of the emitted white light. However, in instances of overheating where blue-light leakage occurs, the temperature rise induces a darkening effect in CNC. By incorporating CNC as a responsive material in the design of white LEDs, our study offers a practical and efficient solution to address the adverse effects of blue-light leakage resulting from overheating. This enhancement not only improves the safety and comfort for users but also serves as an early warning mechanism for the aging of phosphor-converted white LEDs.
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Ching-Cherng Sun, Chih-Hung Chen, Quang‑Khoi Nguyen, Benoît Glorieux, Tsung-Hsun Yang, Chi-Shou Wu, and Yeh-Wei Yu "Anti‑leakage of blue light for phosphor‑converted white LEDs with nano cellulose", Proc. SPIE PC13131, Current Developments in Lens Design and Optical Engineering XXV, PC1313106 (2 October 2024); https://doi.org/10.1117/12.3028744
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KEYWORDS
Light emitting diodes
Cellulose
Crystallography
Crystals
Design
Epoxies
Optical properties
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