Origin of yellow emissions from (In,Ga,Al)N based 450 nm emitting diode lasers

Yellow emissions at 580 nm from the operation of 450 nm emitting (In,Ga,Al)N diode lasers are investigated. Spatial and spectral behaviors were analyzed and modeled. Consistent results were obtained and the emission was identified coming from the active region of the laser. This emission has the potential to be useful for analytical purposes, e.g. for the determination of refractive indices or the visualization of non-equilibrium carrier profiles along devices.