Invited Speakers

Invited Speakers

Dr. Nguyen Doan Quoc Anh
Ton Duc Thang University, Vietnam

Biography: Nguyen Doan Quoc Anh was born in Khanh Hoa province, Vietnam. He is a Lecturer in the Faculty of Electrical and Electronics Engineering at Ton Duc Thang University. He earned his Ph.D. in Electrical Engineering from the National Kaohsiung University of Applied Sciences, Taiwan, in 2014. His research interests focus on optical materials and LED lighting technologies, including freeform and total internal reflection (TIR) lenses, light scattering materials such as phosphors, and novel lighting systems for sustainable applications. Dr. Anh has published over 60 peer-reviewed papers, with more than 600 citations, and holds a U.S. patent on TIR lens technology for automotive lighting. He has led several national and provincial research projects, notably a sustainable fishing lighting project recognized by The Hitachi Global Foundation Asia Innovation Award 2023. His current research emphasizes the development of high-efficiency, cost-effective LED systems and advanced optical designs for energy-saving illumination technologies.

Speech title: IMPROVEMENT OF COLOR UNIFORMITY IN WHITE LIGHT-EMITTING DIODES WITH SCATTERING ENHANCEMENT MATERIALS

Abstract- This study explores the effects of varying particle sizes of scattering materials on the optical performance of white light-emitting diodes (LEDs), with a focus on lumen output, Correlated Color Temperature (CCT), Color Rendering Index (CRI), and Color Quality Scale (CQS). These particles were incorporated into LED systems with varied sizes, and their impact on light scattering, efficiency, and color quality was analyzed using Mie scattering simulations and testing validation. The results indicate that such particles deliver the optimal performance, yielding a substantial lumen output and a significant CQS value, reflecting superior light quality and balanced color rendering. Although the CRI remained moderate, the consistency across various particle sizes suggests that the scattering particles could be a viable material for applications requiring stable color fidelity. Moreover, the CCT analysis revealed minimal color temperature deviation, contributing to more stable lighting conditions. These findings suggest that the material offers competitive optical properties compared to conventional scattering materials with potential applications in high-efficiency LEDs, dynamic lighting solutions, and color-tunable light sources.