The ‘green gap’ – the lack of efficient semiconductor materials that produce green light – has been the target of research at many organisations. Osram Opto is the latest to have a go, using indium gallium nitride (InGaN)-based green LEDs. It claims to have reduced typical forward voltages by around 600mV and increased optical output ...
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from Electronics Weekly https://www.electronicsweekly.com/blogs/led-luminaries/osram-jumps-green-gap-2018-05/
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