  Combined dry-wet transient materials and devices are introduced, which are
based on water-dissolvable dye-doped polymers layered onto non-polar cyclic
hydrocarbon sublimating substrates. Light-emitting heterostructures showing
amplified spontaneous emission are used as illumination sources for
speckle-free, full-field imaging, and transient optical labels are realized
that incorporate QR codes with stably encoded information. The transient
behavior is also studied at the microscopic scale, highlighting the real time
evolution of material domains in the sublimating compound. Finally, the
exhausted components are fully soluble in water thus being naturally
degradable.
