Method for removing sapphire substrate on blue-light luminescent chip

Abstract

A method of removing blue-ray light-emitting chip sapphire substrate takes the reaction of sodium hydroxide solution or other alkaline solution with the sapphire to corrode the sapphire substrate, then the light-emitting chip without the sapphire substrate or with the sapphire substrate greatly reduced can be obtained after being cleansed by de-ionized water. The technique steps can be shown in details below: firstly, the sodium hydroxide solution or other alkaline solution is poured into a container with a flat bottom, and the height of the solution is controlled below 100 microns, the mass percent concentration of the solution is between 1 percent and 40 percent; secondly, the chip with the sapphire substrate is arranged in the sodium hydroxide solution or other alkaline solution, thereby letting the sapphire substrate partially immerged into the solution for 12 to 24 hours, then the sapphire substrate is corroded away completely or in part; thirdly, the de-ionized water gets utilized to cleanse the chip which is then placed into an oven under 100DEG for an hour or two.

Description

Technical field [0001] The invention relates to a method for removing a sapphire substrate of a blue light emitting chip, in particular to a method for removing a sapphire substrate with poor thermal conductivity to improve the luminous efficiency of the chip by improving the heat dissipation performance of a power blue light emitting chip. Background technique [0002] Semiconductor light-emitting diode is an energy-saving, environmentally friendly, and long-life solid light source. Therefore, the research on semiconductor light-emitting diode technology has been very active in the past ten years. It is hoped that it can replace the currently commonly used fluorescent lamps and incandescent lamps in the future. Many large companies around the world have invested a lot of money to improve the luminous efficiency of high-power semiconductor light-emitting diodes, including chip design, manufacturing process and device packaging technology. For high-power LEDs, good heat dissipatio...

AI Technical Summary

Problems solved by technology

Due to the low thermal conductivity of sapphire, the conduction of heat is hindered, causing the temperature of the chip to rise, resulting in a decrease in its luminous efficiency

At present, a few companies adopt the method of laser stripping the sapphire substrate to improve the heat dissipation performance of the chip, but the cost of high-performance light-emitting chips has increased due to expensive equipment and complicated processes