| abstract |
The present invention provides compositions. In one embodiment, a composition is provided and comprises Compound 1 shown below: For compound 1, R 1 to R 24 are the same or different. R 1 to R 24 each are independently selected from hydrogen, unsubstituted hydrocarbyl, substituted hydrocarbyl, cyano, alkoxy, aryloxy, and the group consisting of NR '2 ring. R 'is hydrogen or hydrocarbyl, and two or more of adjacent R 1 to R 24 may optionally form one or more ring structures. Component Z is selected from the group consisting of groups Z-1, Z-2, Z-3, Z-4, Z-5, Z- For compound 1, one or more hydrogen atoms may be optionally substituted with deuterium. |