Abstract
The ground-state (GS) exciton transition is revealed in optical reflectance and photoluminescence (PL) spectra of structures with multiple sheets of nanoscale islands formed by submonolayer CdSe insertions in a ZnMgSSe matrix. The GS transition is absent, however, in the PL excitation (PLE) spectra, demonstrating a typical quantum dot-like PLE behavior. High exciton oscillator strength and lifted k-selection rule caused by exciton confinement permits room temperature zero-phonon lasing (460 nm) resonant to the spectral region of exciton-induced refractive index ( n) enhancement without using thick cladding layers having a lower n.
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