We report on the visible (660 nm) monolithic resonant-cavity light-emitting diode grown by solid source molecular beam epitaxy. The device consisted of a 1.h-thick AlGaInP-based optical active region surrounded by AlGaAs-based distributed Bragg reflectors. Current aperture for the emitter was formed by lateral selective wet thermal oxidation. High continuous-wave output power of almost 2 m W with 5 n m linewidth and peak wall-plug efficiency of 3 % were attained without heatsinking from the 80-pm device. This device was very resistant against temperature variations.