Electroactive materials

An organic electronic device comprising an anode, a cathode, and at least one organic active layer therebetween, wherein the organic active layer is a photoactive layer which comprises a compound having Formula I as a photoactive material and further comprises a host material

• wherein:
• R1 and R2 are the same or different at each occurrence and are selected from the group consisting of alkyl, silyl, germyl, hydrocarbon aryl, N-heteroaryl, O-heteroaryl, S-heteroaryl, N,O-heteroaryl, and deuterated analogs thereof;
• R3 and R4 are the same or different at each occurrence and are selected from the group consisting of D, alkyl, alkoxy, silyl, siloxy, siloxane, germyl, aryl, alkenylaryl, aryloxy, heteroaryl, diarylamino, deuterated alkyl, deuterated alkoxy, deuterated silyl, deuterated siloxy, deuterated siloxane, deuterated germyl, deuterated aryl, deuterated alkenylaryl, deuterated aryloxy, deuterated heteroaryl, and deuterated diarylamino;
• a and b are the same or different and are an integer from 0-4;
• and
• wherein the N-heteroaryl is derived from a compound selected from the group consisting of pyrrole, pyridine, pyrimidine, carbazole, imidazole, benzimidazole, imidazolobenzimidazole, triazole, benzotriazole, triazolopyridine, indole, indolocarbazole, phenanthroline, quinoline, isoquinoline, quinoxaline, substituted derivatives thereof, and deuterated analogs thereof;
• wherein the O-heteroaryl is derived from a compound selected from the group consisting of furan, benzofuran, dibenzofuran, substituted derivatives thereof, and deuterated analogs thereof;
• wherein the S-heteroaryl is derived from a compound selected form the group consisting of thiophene, benzothiophene, dibenzothiophene, substituted derivatives thereof, and deuterated analogs thereof;
• and
• wherein the N,O-heteroaryl is derived from a compound selected from the group consisting of oxazole, benzoxazole, phenoxazine, substituted derivatives thereof, and deuterated analogs thereof;
• wherein the substituted derivatives have substituents selected from the group consisting of D, alkyl, silyl, germyl, aryl, deuterated alkyl, deuterated silyl, deuterated germyl, and deuterated aryl.