Demonstration of a 2.3 mu m emission at room temperature under quasi continuous-wave operation from a Sb-based monolithic Vertical Cavity surface emitting laser is reported. The structure is composed of 2 n-doped AlAsSb/GaSb distributed Bragg reflectors, a type-I GaInAsSb/AlGaAsSb multi quantum well active region and a tunnel junction. For 80 mu m diameter devices, density threshold of 0.8 kA/cm(2) at RT is achieved