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Crystals 2018, 8(12), 442;

Novel Method for Estimating Phosphor Conversion Efficiency of Light-Emitting Diodes

Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Institute of Photonic System, National Chiao Tung University, Tainan 711, Taiwan
Fok Ying Tung Research Institute, Hong Kong University of Science and Technology, Hong Kong 511458, China
Authors to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 24 November 2018 / Accepted: 26 November 2018 / Published: 27 November 2018
(This article belongs to the Special Issue GaN-Based Optoelectronic Materials and Light Emitting Devices)
PDF [1800 KB, uploaded 27 November 2018]


This study presents a novel method for estimating the phosphor conversion efficiency of white light-emitting diodes (WLEDs) with different ratios of phosphors. Numerous attempts have been made for predicting the phosphor conversion efficiency of WLEDs using Monte Carlo ray tracing and the Mie scattering theory. However, because efficiency depends on the phosphor concentration, obtaining a tight match between this model and the experimental results remains a major challenge. An accurate prediction depends on various parameters, including particle size, morphology, and packaging process criteria. Therefore, we developed an efficient model that can successfully correlate the total absorption ratio to the phosphor concentration using a simple equation for estimating the spectra and lumen output. The novel and efficient method proposed here can accelerate WLED development by reducing costs and saving fabrication time. View Full-Text
Keywords: light emitting diode; electro-optical devices light emitting diode; electro-optical devices

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lin, C.-H.; Huang, C.-H.; Pai, Y.-M.; Lee, C.-F.; Lin, C.-C.; Sun, C.-W.; Chen, C.-H.; Sher, C.-W.; Kuo, H.-C. Novel Method for Estimating Phosphor Conversion Efficiency of Light-Emitting Diodes. Crystals 2018, 8, 442.

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