Non-crystallizable pi-conjugated molecular glass mixtures, charge transporting molecular glass mixtures, luminescent molecular glass mixtures, or combinations thereof for organic light emitting diodes and other organic electronics and photonics applications

A composition comprising

• a molecular glass mixture of non-polymeric compounds exhibiting a single thermal transition free of phase separation wherein said molecular glass mixture is characterized as amorphous, solid at about 20° C., and comprises at least two different compounds each independently corresponding to the structure (R1Y1)p[(Z1Y2)mR2Y3]nZ2Y4R3;
• wherein m is zero or one, n is zero up to an integer at which said compound starts to become a polymer and p is an integer of from one to eight;
• R1 and R3 each independently represents a monovalent aliphatic or cycloaliphatic hydrocarbon group having 1 to 20 carbon atoms or an aromatic group or a multicyclic aromatic nucleus;
• R2, Z1 and Z2 each independently represent multivalent aliphatic or cycloaliphatic hydrocarbon groups having 1 to 20 carbon atoms or an aromatic group;
• and
• Y1, Y2, Y3 and Y4 each independently represent a triple bond, a double bond, or a single bond link;
• provided that at least one of R1, Z1, R2, Z2 and R3 is a multicyclic aromatic nucleus, and the glass-transition temperature is above 25° C.