AlGaInP/GaP light-emitting diodes fabricated by wafer direct bonding technology

An AlGaInP/GaP light-emitting diode was fabricated by wafer direct bonding technique. The device was grown on GaAs substrate by metalorganic vapor phase epitaxy (MOVPE). After bonding the n-GaP substrate on top of the epitaxial layers, the original GaAs substrate was removed. The luminous intensity of this wafer-bonded device is around 60 mcd/S-r at an operation current of 20 mA. It is about two times brighter than the conventional device with absorbing GaAs substrate. The large lattice constant mismatch (3.6%) between wafer-bonded GaP substrate and GaInP did not degrade the device characteristics.