Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 29, Pages 10136-10149Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201600652
Keywords
donor-acceptor systems; electrochemistry; luminescence; Spiro compounds; structure-activity; relationships
Categories
Funding
- ANR Project HOME-OLED [11-BS07-020-01]
- ANR project Men In Blue [ANR-14-CE05-0024]
- [c2015085032]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE05-0024] Funding Source: Agence Nationale de la Recherche (ANR)
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This work reports a detailed structure-property relationship study of a series of efficient host materials based on the donor-spiro-acceptor (D-spiro-A) design for green and sky-blue phosphorescent organic light-emitting diodes (PhOLEDs). The electronic and physical effects of the indoloacridine (IA) fragment connected through a spiro bridge to different acceptor units, namely, fluorene, dioxothioxanthene or diazafluorene moiety, have been investigated in depth. The resulting host materials have been easily synthesised through short, efficient, low-cost, and highly adaptable synthetic routes by using common intermediates. The dyes possess a very high triplet energy (ET) and tuneable HOMO/LUMO levels, depending on the strength of the donor/acceptor combination. The peculiar electrochemical and optical properties of the IA moiety have been investigated though a fine comparison with their phenylacridine counterparts to study the influence of planarisation. Finally, these molecules have been incorporated as hosts in green and sky-blue PhOLEDs. For the derivative SIA-TXO2 as a host, external quantum efficiencies as high as 23 and 14% have been obtained for green and sky-blue PhOLEDs, respectively.
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