Abstract
We synthesized three N-phenylcarbazole-capped 9,10-divinylanthrane isomers by changing the linking positions of N-phenylcarbazole, 9,10-bis(N-phenylcarbazol-2-/3-yl-vinyl-2)anthracenes (CZ2/CZ3), and 9,10-bis(4-(carbazol-9-yl)styryl)anthracene (CZ9) to examine isomeric effects on the fluorescence and electroluminescence properties. The results showed that their fluorescence emission properties in both crystalline and amorphous states were affected by the linking position of N-phenylcarbazole. The three isomers were all strong crystallization-enhanced emission (CEE) dyes, whereas the strongest and the weakest fluorescence efficiencies were measured in crystalline and amorphous states of CZ9, respectively. When the isomers were used as bulk emitting layers by vapor deposition, the maximal luminous efficiency, luminance, and the turn-on voltage of CZ9-based device were 0.10 cd A–1, 550 cd cm–2, and 7.8 V, respectively. In sharp contrast, CZ3 afforded the best EL performance, and the corresponding performance...
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