Fig. 1. Picture of the specimen before and after PEO treatment.
Fig. 2. Schematic configuration of heat dissipation performance measurement system for aluminum alloy LED heat sink.
Fig. 4. SEM images of surface morphologies of PEO coatings produced with different current densities.
Fig. 3. Voltage-time response during PEO process for aluminum alloys treated under different current densities.
Fig. 5. Comparison of thickness of PEO coatings with different current densities.
Fig. 6. Result of EDS analysis for the PEO coating produced with 100 mA/cm2 of current density.
Fig. 7. Variation of LED temperatures for LEDs with different heat sinks.
Fig. 8. Infrared thermographic images of LED chip with aluminum alloy heat sink and surface-treated heat sink.
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