Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 35, Pages 7428-7435Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00951g
Keywords
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Funding
- NSFC/China [21161160442, 51203056]
- National Basic Research Program of China (973 Program) [2013CB922104]
- Analytical and Testing Centre at Huazhong University of Science and Technology
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A series of star-shaped host materials DCzPOTA, CzDPOTA and TCTA containing a central triphenylamine (TPA) core, a peripheral modification with different ratios of p-type carbazole units and n-type diphenylphosphine oxide (DPPO) units were purposefully designed and synthesized. Their electronic nature, electrochemical, thermal and morphological properties were investigated systematically. In suitable proportions of carbazole and phosphine oxide, blue PhOLEDs based on DCzPOTA exhibits a maximum power efficiency of 36.9 lm W-1 and an ideal turn-on voltage (2.7 V at 1 cd m(-2)). These results indicate that the electronic nature of the host material can be finely adjusted by gradually changing the donor-acceptor ratio.
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