期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 60, 期 1, 页码 333-338出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2012.2228866
关键词
Color tuning; light-emitting diode (LED)
资金
- General Research Fund of the Research Grant Council of Hong Kong [HKU 7117/11E]
A tightly integrated 3-D RGB light-emitting diode (LED) stack is demonstrated. Chips of identical dimensions are stacked on top of each other, with wire bonds embedded within. This is achieved by integrating laser-micromachined channels onto the sapphire face of InGaN LEDs, serving to accommodate wire bonds from the chip beneath. The resultant structure eliminates leakage of monochromatic light from individual chips, producing optimally mixed emission through the top aperture. The device can emit a wide range of colors and is an efficient phosphor-free white-light LED as well. When emitting at correlated color temperatures (CCTs) of 2362 K, 5999 K, and 7332 K, the device generates similar to 20 lm/W, exhibiting performance invariant of CCT. Thermal characteristics of this multilayered device are investigated via infrared thermometry.
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