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We report on the binding energy of a charged exciton (trion) confined in a single, epitaxially grown 1.7 nm thick ZnO/(Zn,Mg)O quantum well as large as 22 meV or 27.6 meV when determined in micro-photoluminescence or transmission measurements, respectively. Charged exciton emission is found to persist up to near room temperature. The binding energy comparable to thermal energy at room temperature is promising for trion based spintronic and optoelectronic applications. [ABSTRACT FROM AUTHOR]

We report on properties of an optical microcavity based on (Cd,Zn,Mg)Te layers and embedding (Cd,Zn)Te quantum wells. The key point of the structure design is the lattice matching of the whole structure to MgTe, which eliminates the internal strain and allows one to embed an arbitrary number of unstrained quantum wells in the microcavity. We evidence the strong light-matter coupling regime already for the structure containing a single quantum well. Embedding four unstrained quantum wells results in further enhancement of the exciton-photon coupling and the polariton lasing in the strong coupling regime. [ABSTRACT FROM AUTHOR]