Simultaneous Light Emission from a Mixture of Dendrimer Encapsulated Chromophores: A Model for Single-Layer Multichromophoric Organic Light-Emitting Diodes

The site isolation of two dyes capable of electronic interaction via Forster energy transfer has\nbeen studied with the two dyes coumarin 343 and pentathiophene encapsulated by dendrons containing\nboth solubilizing and electroactive moieties. Photoluminescence studies of mixtures of the dendritic dyes\nshow that at high dendron generation, significant site isolation is achieved with relative emission\ncharacteristics influenced by both the degree of site isolation and the emission quantum yield of the dyes.\nElectroluminescence studies carried out in organic light emitting diode devices confirm that color tuning\nmay be achieved by mixing the two encapsulated dyes in a single layer. However, selective carrier trapping\nby one of the core component dyes can dramatically influence the effectiveness of other components in\nthe device.