High spontaneous emission quantum efficiency, is important for photon number squeezed light, diode lasers, single ‐ mode light ‐ emitting ‐ diodes, optical interconnects, and solar cells.» (realclimate.org)
The natural linewidth of a spontaneous emission from greenhouse gases «is an intrinsic property of the transition and can not be changed by modifying the conditions.» (realclimate.org)
One of the most fundamental avenues of study in controlling light - matter interactions is engineering of the spontaneous emission rates of excited electrons in emitters (atoms, molecules, artificial atoms, etc.). (innovationtoronto.com)