High-brightness yellow-light-emitting GaP diodes

High-brightness solid-state light-emitting diodes are required for fibre-optic communications, for film marking and for scanned line arrays to display the output from thermal imaging systems. Using yellow-light-emitting GaP diodes, with the emission limited to a small area, brightnesses of 70 000 ft lamberts have been achieved at continuous currents of 400 mA. When operated with 1 μs pulses, brightnesses of up to 450 000 ft lamberts at 2 A have been estimated.