ELECTRONIC-ENERGY TRANSFER IN CDSE QUANTUM-DOT SOLIDS

We demonstrate electronic energy transfer between close packed quantum dots using cw and time resolved photoluminescence. Optically clear an d thin, close packed quantum dot solids were prepared from mixtures of small and large CdSe quantum dots (38.5 and 62 Angstrom, sigma < 4.5% ). Quenching of the luminescence (lifetime) of the small dots accompan ied by enhancement of the luminescence (lifetime) of the large dots is consistent with long-range resonance transfer of electronic excitatio ns from the more electronically confined states of the small dots to t he higher excited states of the large dots.