Abstract

Even though conventional light-emitting diodes (LEDs) operate without threshold, they still suffer from low electrical-to-optical efficiency, isotropic broadband light emission, and low modulation band width. Microcavity effects, therefore, are essential to improve the performance of an LED,^1,2 Here, we continuously changed the mode interactions? in an LED microcavity by varying the relative position of the microcavity resonance and the quantum well band gap across the wafer. Our systematic study reveals room-tempera tu re cavity enhancements and mode-coupling effects in photo- and electroluminescence. When mode-overlap occurs, we obtain distinct photo- and electroluminescence enhancements, a minimum emitted linewidth. of 4.6 nm at 836 nm with a FWHM divergence of 62.

© 1993 Optical Society of America