The Moth-eye Structure
Prof. Kamiyama’s simple and ingenious idea to use a more vertical light path obtained in the moth-eye layer to minimize the number of reflections in LED chips before light escapes and thereby to reduce absorption (energy loss).
The verticalization effect
Diffraction causes reflected and transversing light to bend at the moth-eye plane
The result is a more vertical angular distribution of light in the LED.
Lower GaN Cost
Using MPSS technology in LEDs has five major benefits:
- Lower energy consumption through enhancement of light extraction efficiency
- Lower cost thanks to a 2 µm thinner undoped GaN layer
- Higher device yield for large size substrates thanks to less wafer bowing
- Improved wavelength uniformity (on large substrates)
- Maintained energy efficiency also for large size devices