dark states

Frequency-dependent spontaneous emission rate from CdSe and CdTe nanocrystals: Influence of dark states
A. F. van Driel, G. Allan, C. Delerue, P. Lodahl, W. L. Vos, and D. Vanmaekelbergh
Phys. Rev. Lett. 95, 236804: 1-4 (2005)