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An experimental observation on irreversible thermal quenching andantiquenching behavior is reported for photoluminescence (PL) of ZnS/CdS:Mn/ZnSquantum well quantum dots (QWQDs) prepared with a reverse micelle method. Thedual-color emissions, a blue emission band centered at 430 nm and a Mn2+ 4T1 ->6A1 orange emission peak at 600 nm, were found to have different dependences ofemission intensity on temperature in the range of 8-290 K. Depending on Mn2+doping concentration, they can both show strong antiquenching behavior in acertain temperature range in addition to the usual thermal quenching whenlowering down temperature while it is very prominent for orange emission butweaker for blue emission. Moreover, the antiquenching behavior is weakened withrise of temperature, giving rise to a hysteretic PL temperature dependence forthe QWQDs.

Irreversible Temperature Quenching and Antiquenching of Photoluminescence of ZnS/CdS:Mn/ZnS Quantum Well Quantum Dots