zinc selenide

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A semiconductor material that was initially more promising for blue LEDs due to a lower lattice mismatch, but proved difficult for p-type creation.

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Why It Was Almost Impossible to Make the Blue LED

Why It Was Almost Impossible to Make the Blue LED

Veritasium

One of the two main semiconductor candidates for blue LEDs, theoretically with a band gap in the blue light range. It was considered more promising due to a lower lattice mismatch with its substrate, but scientists struggled to create the p-type version.