期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 21, 页码 3482-3490出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc00875d
关键词
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资金
- National Key Basic Research and Development Program of China [2009CB930601]
- National Natural Science Foundation of China [21274064, 21144004, 60876010, 61136003, 20804020, 60976019, 20974046, 50428303, 51173081, 21003076, 51273092, 61106058]
- Program for New Century Excellent Talents in University [NCET-11-0992]
- Natural Science Foundation of Jiangsu Province [BK2011761, BK2008053, 11KJB510017, BK2009025, BZ2010043, JHB09-36]
- NJUPT [NY210030, NY211022]
By incorporating electron-transporting pyridine and hole-transporting fluorene moieties into a nonplanar 3-dimensional molecule, via the sp(3)-hybridized carbon linkage by Friedel-Crafts reaction, three novel donor-acceptor (p-n) bipolar host materials 9-(pyridin-2-yl)-3-(9-(pyridin-2-yl)-fluoren-9-yl)-carbazole (CzPy-PyFM), 3,6-bis(9-(pyridine-2-yl)-fluoren-9-yl)-9-(pyridin-2-yl)-carbazole (CzPy-DPyFM) and 5,5 ''-bis(9-(pyridin-2-yl)-fluoren-9-yl-)-2,2':5',2 ''-terthiophene (T3DPyFM) have been synthesized successfully. These pyridinylfluorene end-capped materials with large steric hindrance have been applied as efficient universal hosts for blue, green and red PhOLEDs. The blue, green, and red PhOLEDs hosted by highly thermally stable CzPy-PyFM exhibit the maximum external quantum efficiencies (EQEs) of 10.49%, 11.04%, and 6.50%, respectively. On this basis, the single-emissive-layer three-color and all-phosphor CzPy-PyFM-based white PhOLEDs have been fabricated, which acquire a maximum current efficiency of 10.4 cd A(-1), a power efficiency of 10.2 lm W-1 and an EQE of 5.58%. This is the first example of the diarylfluorenes as universal hosts for full-color RGB PhOLEDs as well as white PhOLEDs.
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