CO2 Laser Processing On Ceramic Substrates Of Light Emitting Diode Assisted By Compressed Gas |
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Authors: | Yeeu-Chang Lee Ming-Hau Cheng |
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Affiliation: | 1. Department of Mechanical Engineering, R&2. D Center for Microsystem Engineering, Chung Yuan Christian University, Chung-Li, Taiwan |
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Abstract: | The use of ceramic substrates in high power LEDs is becoming increasingly common. However, the brittleness of ceramics makes them difficult to process and susceptible to cracking. This study used a CO2 laser with auxiliary gas to drill and cut Al2O3 and AlN ceramic substrates. The authors investigated the influences of parameters such as auxiliary gas pressure, laser power, repetition rate, and working speed on processing quality, in terms of pattern size, surface roughness, hole taper angle, and fracturing. The experiment results show that Al2O3 low-cost processing can be achieved with low laser power and high auxiliary gas pressure. In contrast, AlN has a high melting point and high thermal conductivity, for which lower auxiliary gas pressure is required to ensure high-quality processing. |
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Keywords: | AlN Al2O3 CO2 laser LED ceramic substrate |
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