Journal
DALTON TRANSACTIONS
Volume 41, Issue 2, Pages 523-530Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt11215e
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Funding
- NSFC [20903020]
- 973 Program [2009CB623605]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0714]
- Science Foundation for Young of Jilin Scientific Development Project [20100182]
- State Key Laboratory of Supramolecular Structure and Materials [SKLSSM 201107]
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We report the synthesis and characterization of two cationic iridium(III) complexes with dendritic carbazole ligands as ancillary ligands, namely, [Ir(ppy)(2)L-3]PF6 (1) and [Ir(ppy)(2)L4]PF6 (2), where L3 and L4 represent 3,8-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)-1,10-phenanthroline and 3,8-bis(3', 6'-di-tert-butyl-6-(3,6-di-tert-butyl-9H-carbazol-9-yl)-3,9'-bi(9H-carbazol)-9-yl)-1,10-phenanthroline, respectively. Their photophysical properties have been investigated and compared. The results have shown that complex 2 is aggregation-induced phosphorescent emission (AIPE) active and exhibits the highest photoluminescent quantum yield (PLQY) of 16.2% in neat film among the reported cationic Ir(III) complexes with AIPE activity. In addition, it also enjoys redox reversibility, good film-forming ability, excellent thermal stability as well as off/on luminescence switching properties, revealing its potential application as a candidate for light-emitting electrochemical cells and organic vapor sensing. To explore applications in biology, 2 was used to image cells.
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