Azlactone-related dopants in the emissive layer of an OLED

Abstract

Organic light emitting devices are disclosed which are comprised of a heterostructure for producing electoluminescence wherein the heterostructure is comprised of an emissive layer containing a dopant compound selected from the class of azlactone-related compounds having the chemical structure as represented by formula I: ##STR1## where R is hydrogen or a donor or acceptor group relative to hydrogen; R'=alkyl or substituted or unsubstituted aryl; R.sub.1 and R.sub.2 are hydrogen or are joined to form a fused aryl ring; X is O; NR.sub.5, where R.sub.5 is hydrogen or substituted or unsubstituted alkyl; alkyl or substituted or unsubstituted aryl; Z.sub.1 and Z.sub.2 are, independently of one another, a carbon or nitrogen atom; and Y is M, a metal atom, whenever Z.sub.1 and Z.sub.2 are both nitrogen atoms; Y is O; NR.sub.6, where R.sub.6 is hydrogen or substituted or unsubstituted alkyl; or S; whenever either Z.sub.1 or Z.sub.2 is a carbon atom; or Y is absent.

Dependencies are inferred from the claim text.