期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 2, 期 21, 页码 4156-4166出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00171k
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资金
- ANR [ANR-11-BS07-020-01]
We report herein a new pure hydrocarbon material, 4-phenyl-9,9'-spirobifluorene (4-Ph-SBF), with a high triplet energy level (E-T: 2.77 eV) as a host for blue phosphorescent organic light-emitting diodes (PhOLEDs). Structural, thermal, electrochemical and photophysical properties have been investigated in detail and compared to its constituting building block 9,9'-spirobifluorene (SBF) in order to precisely study the influence of the incorporation of a phenyl unit in C4. A surprising out of plane deformation of the fluorene ring and a highly twisted structure have been notably found for 4-Ph-SBF due to the substitution in C4. As both 4-Ph-SBF and SBF possess a high triplet energy level (2.77/2.87 eV resp.), they have been successfully used as host materials for green and blue PhOLEDs. The performance of blue PhOLEDs, ca. 20 cd A(-1), appears to be among the highest reported for pure hydrocarbon derivatives.
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