High-field electron paramagnetic resonance as a microscopic probe of anisotropic strain at Mn2+ sites in CdSe:Mn2+ quantum dots

► Mn2+ doped nanoparticles are studied by high field electron paramagnetic resonance. ► A core Mn2+ site and a surface Mn2+ site are clearly distinguished. ► High field EPR measures lattice strain in Mn2+ doped CdSe quantum dots.