Antenna size effect: The influence on energy transfer in the CdTe-pseudoisocyanine nanocomposite system

► Enormous increase of J-aggregate fluorescence in the vicinity of CdTe nanocrystals. ► This enormous effect was accompanied by rather modest energy transfer efficiency. ► The rearrangement in the J-aggregate structure takes place with change of pH. ► Energy transfer was observed only when the J-aggregate antenna size is high enough.