  This paper reviews recent progress in the synthesis of near-infrared (NIR)
lead chalcogenide (PbX; PbX=PbS, PbSe, PbTe) quantum dots (QDs) and their
applications in NIR QDs based light emitting diodes (NIR-QLEDs). It summarizes
the strategies of how to synthesize high efficiency PbX QDs and how to realize
high performance PbX based NIR-QLEDs.
