NDLI: Thermal resistance and reliability of low-cost high-power LED packages under WHTOL test

Content Provider	IEEE Xplore Digital Library
Author	Chen, C.H. Tsai, W.L. Tsai, M.Y.
Copyright Year	2008
Description	Author affiliation: Dept. of Mech. Eng., Chang Gung Univ., Taoyuan (Chen, C.H.; Tsai, W.L.; Tsai, M.Y.)
Abstract	The high-power Light Emitting Diode (LED) can be potentially used for general lighting to alleviate the global warming problem. However, the LED issues, associated with high cost, high junction temperature, low luminous efficiency, and low reliability, have to be resolved before becoming realized. Featuring low-junction-temperature and low-cost design, a novel high-power COP (Chip-on-Plate) LED package is proposed and its reliability under wet high temperature operation life (WHTOL) test is evaluated. The WHTOL test is with the condition of 85degC/85%RH and 350 mA (power=1.22 W) of forward current for 1008 hrs, specified in JESD22 Method A101-B. First of all, the thermal behaviors of the COP package are investigated by experimental measurement (with LED junction temperature tester and thermal couples), a thermal resistance circuit (TRC) method and a finite element method (FEM). The junction temperature $(T_{j})$ and surface temperature of the COP package are measured by the junction temperature tester and thermal couples, respectively. Furthermore, the reliability under WHTOL test is carried out. The results show that all COP packages with phosphorus in the silicone encapsulant failed after 309 hrs at WHTOL test, but all those without phosphorus passed for 1008 hrs. The failure sites are located at aluminum wire debonding to the chip and copper pad of the substrate. For the passing packages, their junction to air thermal resistances increase with the time of WHTOL by up to 12degC/W. This is due to the decrease of the thermal conductivity of the die attach, resulting from the moisture absorption. The natural and forced convections in the chamber for WHTOL test give the same the junction-to-aluminum substrate thermal resistance, but different chip junction temperatures with a 19degC difference, which might result in different reliability data. Therefore, the standard test of WHTOL should specify flow conditions in the test chamber.
Starting Page	271
Ending Page	276
File Size	7977448
Page Count	6
File Format	PDF
ISBN	9781424436200
DOI	10.1109/EMAP.2008.4784281
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-22
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal resistance Light emitting diodes Packaging Temperature Circuit testing Thermal conductivity Electrical resistance measurement Coupling circuits LED lamps Global warming junction temperature LED thermal reliability
Content Type	Text
Resource Type	Article

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