Patent ID: 8859110

Claim:
An organic light-emitting diode, comprising at least one cyclic phosphazene compound of formula (I) wherein: n is from 3 to 8; R 1 and R 2 are each the same or different, and each independently a substituted or unsubstituted aryl, a substituted or unsubstituted heteroaryl, a substituted or unsubstituted alkyl, a substituted or unsubstituted aryloxy, a substituted or unsubstituted alkyloxy, an unsubstituted or substituted cycloalkyl, an unsubstituted or substituted heterocycloalkyl, an unsubstituted or substituted alkenyl, an unsubstituted or substituted alkynyl, an unsubstituted or substituted aralkyl, or F; or R 1 and R 2 are each independently, in the n groups of formula (I), joined to one another via a bond, a C 1 -C 6 -alkylene bridge, an arylene bridge, or a C 2 -C 6 -alkenylene bridge, such that R 1 and R 2 together with the phosphorus atom to which they are joined form a cycle; wherein at least one of R 1 and R 2 is joined to at least one of the phosphorus atoms of the at least one cyclic phosphazene compound of formula (I) not via an oxygen atom, and wherein the at least one cyclic phosphazene compound is a matrix material in a light-emitting layer, a hole/exciton blocker material, an electron conductor, an electron injection material, an electron/exciton blocker material, a hole injection material and/or a hole conductor.