RGBArrays for Micro-Light-Emitting Diode ApplicationsUsing Nanoporous GaN Embedded with Quantum Dots
2020
The
multiple light scattering of nanoporous (NP) GaN was systematically
studied and applied to the color down-conversion for micro-light-emitting
diode (LED) display applications. The transport mean free path (TMFP)
in NP GaN is 660 nm at 450 nm (light wavelength), and it decreases
with a decreasing wavelength. It was observed that the short TMFP
of the NP GaN increased the light extinction coefficient at 370 nm
by 11 times. Colloidal QDs were loaded into a half 4″ wafer
scale NP GaN, and 96 and 100% of light conversion efficiencies for
green and red were achieved, respectively. By loading green and red
QDs selectively into NP GaN mesas, we demonstrated the RGB microarrays
based on the blue-violet pumping light with green and red color converting
regions.
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