NOVELTY - Composition of matter comprising substituted phenylamine compounds (I), is new.    USE - (I) is useful in an organic light emitting device, which is useful in a consumer product (all claimed), preferably flat panel displays, computer monitors, televisions, billboards, lights for interior or exterior illumination and/or signaling, heads up displays, fully transparent displays, flexible displays, laser printers, telephones, cell phones, personal digital assistants, laptop computers, digital cameras, camcorders, viewfinders, micro-displays, vehicles, a large area wall, theater or stadium screen, and a sign. (I) is useful in optoelectronic devices (organic solar cells, organic photodetectors and organic transistors).    ADVANTAGE - (I) provides: stabilization toward reduction of the hole transport materials when electrons leak into the hole transporting layer; more stable and efficient organic light emitting devices; and superior performance in device voltage, luminous efficiency and the lifetime.    DETAILED DESCRIPTION - Composition of matter comprising substituted phenylamine compounds of formula (I), is new.    n = 1-3, where the phenyl rings between the nitrogen atoms may be attached to each other and to the nitrogen atoms in a para or meta configuration for each attachment;    R1-R4 = phenyl moiety of formula (a), 2-phenyl-triphenylene moiety of formula (b) or (c), triphenylene moiety of formula (d), biphenyl moiety of formula (e) or (1,1';4',1'')terphenyl moiety of formula (f); and    Dotted line = point of attachment to a nitrogen atom of (I), where at least one of R1-R4 is (b)-(d) and R1-R4 may be further substituted with substituents that are not fused to R1-R4.    An INDEPENDENT CLAIM is included for an organic light emitting device (100), comprising: an anode (115); a cathode; an organic emissive layer, disposed between the anode and the cathode, where the layer further comprises a host and a phosphorescent dopant; and an organic hole transport layer (125) comprising a hole transport material, disposed between the organic emissive layer and the anode, and in direct contact with the organic emissive layer, where the hole transport material has (I).    DESCRIPTION OF DRAWING(S) - The figure shows an organic light emitting device.    Organic light emitting device (100)    Substrate (110)    Anode (115)    Hole injection layer (120)    Hole transport layer (125)