TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The compound (I) is chosen from 132 carbazole compounds chosen from N-(4-(6,9-diphenyl-9H-carbazol-3-yl)phenyl)-2,3,4,5,6-pentahydrogenio-N-(2,3,4,5,6-pentahydrogeniophenyl)aniline, 2,3,4,5,6-pentahydrogenio-N-(4-(6-(naphthalen-1-yl)-9-phenyl-9H-carbazol-3-yl)phenyl)-N-(2,3,4,5,6-pentahydrogeniophenyl)aniline, 2,3,4,5,6-pentahydrogenio-N-(4-(6-(naphthalen-2-yl)-9-phenyl-9H-carbazol-3-yl)phenyl)-N-(2,3,4,5,6-pentahydrogeniophenyl)aniline, 2,3,4,5,6-pentahydrogenio-N-(2,3,4,5,6-pentahydrogeniophenyl)-N-(4-(20-phenyl-10-thia-20-azapentacyclo(11.7.0.03,11.04,9.014,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaen-16-yl)phenyl)aniline and 6-(4-(bis(2,3,4,5,6-pentahydrogeniophenyl)amino)phenyl)-9-phenyl-9H-carbazole-3-carbonitrile. The compound (II) is chosen from 120 fluorene compounds chosen from 9,9-dimethyl-N-(4-(4-((2,3,4,5,6-pentahydrogeniophenyl)(phenyl)amino)phenyl)phenyl)-N-phenyl-9H-fluoren-2-amine, 9,9-dimethyl-N-(4-(4-(naphthalen-1-yl(2,3,4,5,6-pentahydrogeniophenyl)amino)phenyl)phenyl)-N-phenyl-9H-fluoren-2-amine, 9,9-dimethyl-N-(4-(4-(naphthalen-2-yl(2,3,4,5,6-pentahydrogeniophenyl)amino)phenyl)phenyl)-N-phenyl-9H-fluoren-2-amine, 9,9-dimethyl-N-(4-(4-((2,3,4,5,6-pentahydrogeniophenyl)(4-phenylphenyl)amino)phenyl)phenyl)-N-phenyl-9H-fluoren-2-amine and N-(4-(4-((9,9-dimethyl-9H-fluoren-2-yl)(phenyl)amino)phenyl)phenyl)-N-(2,3,4,5,6-pentahydrogeniophenyl)-5-phenylthiophen-2-amine. Full Definitions:    Ar1-Ar3=6-60C aryl optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 1-20C alkoxy, 1-20C alkylamine, 1-20C alkylthiophene, 6-20C arylthiopen, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 6-60C aryl, 6-20C aryl substituted by deuterium, 8-20C arylalkenyl, silane, boron, germanium or 5-20C heterocyclic group, 5-60C heteroaryl which has at least one of O, N, and S and is optionally substituted by H, deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 8-20C arylamine, 6-60C aryl, 6-20C aryl substituted by deuterium, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclic group, nitrile, or acetylene, 1-30C alkoxy optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, 6-20C aryl substituted by deuterium or 3-60C heteroaryl, 6-30C aryloxy optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, 6-20C aryl substituted by deuterium, or 3-60C heteroaryl, 6-60C arylamine optionally substituted by halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, or 3-60C heteroaryl, or 1-50C alkyl optionally substituted by 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 2-20C aryl substituted by deuterium, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclic group, nitrile, or acetylene, where at least one of Ar1-Ar3 includes more than one deuterium, and Ar3 includes more than one deuterium when Ar2 is optionally substituted by fluoro;    R1-R4=H, deuterium, halo, nitro, nitrile, amino, 6-60C aryl optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 1-20C alkoxy, 1-20C alkylamine, 1-20C alkylthiophene, 6-20C arylthiopen, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 6-60C aryl, 2-20C aryl substituted by deuterium, 2-20C arylalkenyl, silane group, boron, germanium or 5-20C heterocyclic group, 5-60C heteroaryl which has O, N, and S and which is optionally substituted by H, deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 8-20C arylamine, 6-60C aryl, 2-20C aryl substituted by deuterium, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclic group, nitrile or acetylene, 1-30C alkoxy optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, 2-20C aryl substituted by deuterium or 3-60C heteroaryl, 6-30C aryloxy optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, 2-20C aryl substituted by deuterium, or 3-60C heteroaryl, or 1-50C alkyl optionally substituted by 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 2-20C aryl substituted by deuterium, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclic, nitrile, or acetylene;    or R1+R2=saturated or unsaturated aliphatic ring or hetero ring;    L=6-60C arylene optionally substituted by nitro, nitrile, halo, alkyl, alkoxy, or amino, or 5-60C heteroarylene optionally substituted by nitro, nitrile, halo, alkyl, alkoxy, or amino;    a=1-4;    b=1-3;    c=0-2;    R',R"=6-60C aryl optionally substituted by H, deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 1-20C alkoxy, 1-20C alkylamine, 1-20C alkylthiophene, 6-20C arylthiopen, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 6-60C aryl, 2-20C aryl substituted by deuterium, 2-20C arylalkenyl, silane, boron, germanium, or 5-20C heterocyclic group, or 1-50C alkyl optionally substituted by 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 2-20C aryl substituted by deuterium, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclic group, nitrile, or acetylene;    or R'+R"=(un)saturated aliphatic ring, hetero ring, or spiro compound;    d=1-3;and    e,f,g=1-4.    Preferred Definitions:    Ar1-Ar3=28 aromatic group chosen from group of formula (a)-(e).