Roomhyphen;temperature exciton luminescence in IIhyphen;VI quantum wells

摘要

We observe free excitons in absorption and emission at room temperature in Cd0.25Zn0.75Te/ZnTe multiple quantum wells. A large overlap between luminescence and absorption peaks observed at 10 K is maintained up to room temperature showing that the luminescence is predominantly excitonic. From a rate equation analysis we calculate the branching ratio for free carriers relaxing into excitons to freehyphen;carrier radiative recombination.