Packaging efficiency in phosphor-converted white LEDs and its impact to the limit of luminous efficacy

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Title:	Packaging efficiency in phosphor-converted white LEDs and its impact to the limit of luminous efficacy
Authors:	劉正毓;Sun, Ching-Cherng;Chang, Yu-Yu;Yang, Tsung-Hsun;Chung, Te-Yuan;Chen, Cheng-Chien;Lee, Tsung-Xian;Li, Dun-Ru;Lu, Chun-Yan;Ting, Zi-Yan;Glorieux, Benoît;Chen, Yi-Chun;Lai, Kun-Yu;Liu, Cheng-Yi
Contributors:	工學院化學工程與材料工程學系
Keywords:	Circuits and Systems;Electronic Circuits and Devices;Engineering;Engineering Sciences;Lasers;LED Materials and Devices;Microwaves;Optical and Electronic Materials;Optical Devices;Optics;Photonic;Photonics;Research Article;RF and Optical Engineering;Semiconductors
Date:	2014-11-18
Issue Date:	2026-04-21 14:29:44 (UTC+8)
Publisher:	Adis International Ltd;Cham: Springer International Publishing
Abstract:	摘要： In this paper, we start from the study on the packaging efficiency of the phosphor-converted white LED via a new way to measure and calculate the blue light from the blue die to the encapsulation lens. Then we try to estimate the limit of luminous efficacy of a pcW-LED with Type VII structure. In the calculation, with the EQE of 81% of the blue die and Stokes loss, we obtain the optimal limit of luminous efficacy. The largest one reaches 300 lm/W, and occurs for green-white light with CCT from 4000K to 5000K. More practical limit is calculated in considering phosphor quantum loss and geometry loss, and the practical limit of luminous for CRI around 60 is around 210 lm/W, and for CRI larger than 80 is around 175 lm/W. Luminous efficacy will be sacrificed to obtain higher CRI. In order to know the real optical flux on the illuminated target, we introduce the optical utilization factor (OUF). Three application cases are discussed. The OUFs for light bulb, automotive head lamp, and street light are 90%, 60% and 45%, respectively. In considering human factors, it is interesting to find that a light source with lower luminous efficacy can perform higher illumination luminous efficacy (ILE). Therefore it is important to use ILE rather than LE when a light source is practically applied to lighting. 其他題名： J Sol State Light 出版者： Cham: Springer International Publishing 出版日期： 2014-11-18 出處： Journal of solid state lighting, 2014-11, Vol.1 (1), p.1, Article 19 資源來源： Publicly Available Content Database (Proquest) 版權： Sun et al.; licensee Springer. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 版權： The Author(s) 2014 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 2196-1107 識別號： EISSN: 2196-1107 識別號： DOI: 10.1186/s40539-014-0019-0
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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