Why is a sapphire substrate used in LEDs?

Question

Electronics

Why is a sapphire substrate used in LEDs? What are her special properties?

Answer 1

Sapphire has very good thermal conductivity and thermal stability. This is important for good cooling of the LED chip, which is necessary for its high efficiency and durability. You can see the specifications here .

Answer 2

Sapphire also has a relatively high refractive index of ~1.7, but this is still not enough to capture total internal reflection ( gallium nitride will have a higher 2.3) and "bring" light out of the chip. Accordingly, these substrates also texture.

Answer 3

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Answer 4

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Answer 5

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