Electrically driven photon antibunching from a single molecule at room temperature. M. Nothaft, S. Höhla, F. Jelezko, N. Frühauf, J. Pflaum and J. Wrachtrup in Nature Comm. 3:628 (2012).

This is a technological result, namely, realizing antibunching from electron-excitation at room temperature. This relies on an organic molecule (namely, a single Ir(piq)${}_3$ (tris(1-phenylisoquinoline)iridium) molecule) embedded in a matrix. No new physics as compared to similar papers.

The level scheme is the standard 3LS, with singlet/triplet and conduction bands:

They find a single exponential $g^{(2)}(\tau)$ (plotted here in log-linear scales, hence the shape):

Note that the noise is stronger at the inflection point, with unclear reason why.