Before revision: MEG was first demonstrated in 2004 using colloidal PbSe quantum dots and later was observed for quantum dots of other compositions including PbS, PbTe, CdS, CdSe, InAs, Si, and InP .
After revision: MEG was first observed in 2004 using colloidal PbSe quantum dots and later was found in quantum dots of other compositions including PbS, PbTe, CdS, CdSe, InAs, Si, and InP .