Inverted-cone-lens encapsulant with gradient surface for ring-remote-phosphor structure

Ming Te Lin, Shang Ping Ying, Ming Yao Lin, Kuang Yu Tai, Sheng Chieh Tai, Chih Hsuan Liu, Jyh Chen Chen, Ching Cherng Sun

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

The ordinary ring-remote-phosphor structure consisting of an inverted-cone-lens encapsulant and a surrounding ring-remote-phosphor layer reduces the probability of the backward light from the phosphor layer to the absorptive light-emitting diode (LED) chip and then increases the package extraction efficiency. However, some of the blue light emitting from the LED chip impinges on the inverted-cone-lens surface and then escapes without hitting the ring-remote-phosphor layer. The blue light leakage from the inverted-cone-lens surface is a serious problem for the ring-remote-phosphor structure devices in use, because it will lower the actual illumination effects and result in discomfort for the eyes. In this paper, we discuss the predominant factors of the blue light leakage from the inverted-cone-lens surface and propose an improve ring-remote-phosphor structure that utilizes an inverted-cone-lens encapsulant with gradient surface to decrease the blue light leakage. Ray-tracing simulations are performed to analyze the blue light leakages from the ordinary and improved inverted-cone-lens encapsulants in the ring-remote-phosphor structures. The simulation results show that the improved inverted-cone-lens encapsulants get almost no blue light leakage from the inverted-cone-lens surface directly and then lessen the discomfort for the eyes. Our results further demonstrate that the improved ring-remote-phosphor structure device will have higher angular color uniformity than the ordinary one.

原文???core.languages.en_GB???
文章編號6218766
頁(從 - 到)358-364
頁數7
期刊IEEE Transactions on Device and Materials Reliability
14
發行號1
DOIs
出版狀態已出版 - 3月 2014

指紋

深入研究「Inverted-cone-lens encapsulant with gradient surface for ring-remote-phosphor structure」主題。共同形成了獨特的指紋。

引用此