Patent ID: 7977861

Claim:
A composition comprising a mixture of at least two different dendrimers A and B which possess the same core and the same repeating unit or units in the dendrons wherein either the generation of at least one of said dendrons in one of said dendrimers (A) is different from the generation of at least one of the dendrons in the other of said dendrimers (B), or the number of dendrons in one of said dendrimers is different from the number of dendrons in the other of said dendrimers, or both the number of dendrons and the generation of at least one of the dendrons in one said dendrimer (A) is different from the number and generation of dendrons in the other said dendrimer (B), and wherein (i) the dendrimers A and B are phosphorescent organometallic dendrimers which have at least one inherently at least partially conjugated dendron, and (ii) the composition is charge transporting and/or emissive.