Chien-Ping Wang

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0026-2714/$ see front matter Crown Copyright 2 doi:10.1016/j.microrel.2010.03.007 * Corresponding author. E-mail address: cpwang@itri.org.tw (C.-P. Wang). The investigation explores the factors that influence the long-term performance of high-power 1 Wwhite light emitting diodes (LEDs). LEDs underwent an aging test in which they were exposed to various(More)
We propose the output power measurement of bare-wafer/chip light-emitting diodes (LEDs) using a large-area silicon (Si) photodiode with a simple structure and high accuracy relative to the conventional partial flux measurement using an integrating sphere. To obtain the optical characteristics of the LED chips measured using the two methods,(More)
For high-power light-emitting diodes, heat management and reliability are important issues. The reliability and long lifetime of solid state lighting are especially essential in the high temperature applications, such as street lighting and automotive lighting. Because of the characteristics of semiconductor, the electrical property of light-emitting diodes(More)
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