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Higher green LED efficiency using low-temperature semiconductor process

Editorial
article image ​BLUGLASS says its low temperature process can produce green LEDs of greater efficiency.

BLUGLASS says its low temperature process can produce green LEDs of greater efficiency.

The Australian company’s key semiconductor technology is “remote plasma chemical vapour deposition” (RPCVD), a low temperature deposition process. Bluglass tested its RPCVD p-GaN process to create green LEDs, while comparing it with its in-house metalorganic vapour phase epitaxy (MOCVD) p-GaN process, which uses higher temperatures.

Early results show green LEDs produced with RPCVD p-GaN had greater efficiency compared to those created with MOCVD p-GaN.

According to Bluglass, this indicates the inherent advantages of a low temperature process for green LEDs. True green LEDs are required for balance and efficiency in the next generation of lighting and display markets.

The green LEDs produced using both the RPCVD and MCVD processes used the same multi-quantum wells (MQWs), which is the critical light emitting region of an LED device. Since the RPCVD LEDs demonstrated greater efficiency, Bluglass says that means the low temperature of the process is helping improve device performance by reducing the degradation of the temperature-sensitive MQW layers.

BluGlass will continue to conduct experimentation to further validate these results. To date, BluGlass has been experimenting on improving blue LEDs, but the tests show that its efforts can be transferred to green LEDs. This is particularly true because green LEDs require high indium content MQWs, which are sensitive to high temperatures during the growth process.

BluGlass is currently looking to expand RPCVD research into new, high growth market applications with strong potential for a low temperature deposition technology such as power electronics, green and yellow LEDs and UV LEDs .

Green LEDs are important for RGB (Red, Green and Blue) LED applications that enable the device to have full colour control. The LED industry is very interested in the possibility of a cost effective RGB solution to create more natural looking light.

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