Effcient single photon emission of CdSe quantumdots at temperatures up to 200 K

摘要

We report on pulsed photon correlation experiments to study single-photon emission for temperatures up to 200 K. The experiments were carried out usingepitaxially grown self-assembled CdSe/Zn(S,Se) quantum dots. At low temperatures(T < 40 K) nearly perfect single-photon emission from an individual CdSe quantum dotis observed. For higher temperatures (T > 40 K) an increasing multi-photon emissionprobability due to spectrally overlapping acoustic phonon sidebands of neighboringquantum dots is found. If the background is subtracted from the quantum dot emissionline, there is still a strong suppression of the multi-photon emission at 200 K comparedto a Poissonian light source of the same average intensity. Our results demonstratethe large potential of self-assembled CdSe/Zn(S,Se) quantum dots for generation ofnonclassical light at temperatures up to 200 K .