Department of Chemistry
Efficient blue organic light-emitting diodes based on triphenylimidazole substituted anthracene derivatives
© 2015 Elsevier B.V. All rights reserved.A series of new blue emissive materials based on the conjugates of highly fluorescent diaryl anthracene and electron-transporting triphenylimidazole moieties: 2-(4-(anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (ACBI), 2-(4-(10-(naphthalen-1-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (1-NaCBI), 2-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (2-NaCBI) were designed and synthesized successfully. These materials exhibit good film-forming properties and excellent thermal stabilities. Meanwhile, the decreased π-conjugation in these compounds compared with phenanthroimidazole derivatives leads to obvious hypsochromic shift. To explore the electroluminescence properties of these materials, typical three-layer organic light-emitting devices were fabricated. With respect to the three layer device 2 using 1-NaCBI as the emitting layer, its maximum current efficiency reaches 3.06 cd A-1 with Commission Internationale del'Eclairage (CIE) coordinates of (0.149, 0.092). More interestingly, sky blue doped device 5 based on 1-NaCBI achieved a maximum current efficiency of 15.53 cd A-1 and a maximum external quantum efficiency of 8.15%, high EQE has been proved to be induced by the up-conversion of a triplet excited state.
1, 4, 5-Triphenyl-1H-imidazole, Anthracene, Blue material, Organic light-emitting devices, Triplet-triplet annihilation
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Link to Publisher's Edition
Mu, Guangyuan, Shaoqing Zhuang, Wenzhi Zhang, Yixin Wang, Bo Wang, Lei Wang, and Xunjin Zhu. "Efficient blue organic light-emitting diodes based on triphenylimidazole substituted anthracene derivatives." Organic Electronics 21 (2015): 9-18.