Biexcitons in II-VI crystals
Razbirin B.S. , Ural'tsev I.N. , Mikhailov G.V.
The existence of biexciton states at high excitation intensities has been experimentally established in crystals CdS and CdSe with binding energies 2.5 meV (CdS) and 1.2 meV (CdSe).