Organic electroluminescent materials and devices
A mixture containing three different compounds that is useful as a stable co-evaporation source material for a vacuum deposition tool is disclosed. The mixture comprises a first compound; a second compound; and a third compound that are all organic compounds and have different chemical structures from each other and each has an evaporation temperature T1, T2, and T3, respectively, in the range of 150 to 350° C. T1, T2, and T3 differ from each other by less than 20° C. The first compound has a concentration C1 in the first mixture and a concentration C2 in a film deposited by evaporating the first mixture in a high vacuum deposition tool under a predefined deposition condition where |(C1−C2)/C1| is less than 5%.
1. A method for fabricating a first organic light emitting device comprising an emissive layer, the method comprising:
providing a first container that contains a pre-mixed co-evaporation source for a vacuum deposition process, wherein the pre-mixed co-evaporation source is
a mixture comprising: an electron-transporting co-host compound (e-host); a first hole-transporting co-host compound (h-host); and a second hole-transporting co-host compound (h-host), wherein
the e-host is Compound C74
the first h-host is Compound H8
and
the second h-host is Compound H17
or
a mixture comprising: an electron-transporting co-host compound (e-host); a hole-transporting co-host compound (h-host); and an emitter compound, wherein
the e-host is Compound E2
the h-host is Compound H5
and
the emitter is
and
forming the emissive layer of the first device by co-evaporating the pre-mixed co-evaporation source in a vacuum deposition tool.
2. A pre-mixed co-evaporation source for vacuum deposition process, that is a mixture comprising: an electron-transporting co-host compound (e-host); a first hole-transporting co-host compound (h-host); and a second hole-transporting co-host compound (h-host), wherein
the e-host is Compound C74
the first h-host is Compound H8
and
the second h-host is Compound H17
3. A pre-mixed co-evaporation source for vacuum deposition process that is a mixture comprising: an electron-transporting co-host compound (e-host); a hole-transporting co-host compound (h-host); and an emitter compound, wherein
the e-host is Compound E2
the h-host is Compound H5
and
the emitter is