NDLI: Thermal Behavior of Remote Phosphor in Light-Emitting Diode Packages

Content Provider	IEEE Xplore Digital Library
Author	Kim, J.H. Shin, M.W.
Copyright Year	1980
Abstract	This letter reports on the detailed thermal behavior of remote type light-emitting diode (LED) packages with different positions of a phosphor layer from the substrate. The temperatures of phosphor layers were directly measured using microthermocouples. It was confirmed by both measurement and simulation, for the investigated LED package structure, the phosphor temperatures are always higher than the junction temperature. Both temperatures are found to change as a function of the phosphor-substrate distance. It is demonstrated that the distance determines the effect of back-scattered photons and the thermal resistance between the phosphor layer and the substrate. From both the experiment and simulation results, it is proposed that there exists an optimal distance of phosphor layer in the remote-type LED package, which is about 320 μm for the package structure utilized in this study. The package with the optimal position exhibits an optical output which is 6% higher than that from a package where the phosphor layer directly covers LED chip. It is shown that the heating load at the phosphor layer changes with the position of the phosphor layer and must be implemented for the precise thermal analysis of whole LED package.
Sponsorship	IEEE Electron Devices Society
Starting Page	832
Ending Page	834
Page Count	3
File Size	1397049
File Format	PDF
ISSN	07413106
Volume Number	36
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phosphors Light emitting diodes Temperature measurement Heating Photonics Optical scattering Optical imaging phosphor temperature Light-emitting diode (LED) scattered photon extraction (SPE) remote phosphor
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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