Journal
OPTICAL MATERIALS
Volume 101, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2020.109726
Keywords
Fluorescent materials; Phenanthroimidazole; Triphenylamine; Non-doped OLEDs; Bipolar characteristic
Categories
Funding
- Science and Technology Research Program of Education department of Jiangxi Province, China [GJJ170928]
- National Natural Science Foundation of China [:61741510]
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Blue organic emissive materials are still the most important bottlenecks for the development of organic light-emitting diodes (OLEDs). To enrich the material library, herin, three bipolar phenanthroimidazole derivatives, namely MePPIM-TPA, ClPPIM- TPA and BuPPIM-TPA, are synthesized using triphenylamine as electron-donor and phenanthroimidazole as the electron-acceptor. The photophysical, thermal and electrochemical properties of three compounds are investigated with high decomposition temperature up to 350 degrees C, and strong blue emission. Single-carrier devices are fabricated to show that three compounds have good bipolar carrier transport characteristic. The non-doped fluorescent OLEDs devices using three compounds as emitting layers are fabricated among which the devices based on MePPIM-TPA achieved the maximum luminance of 1743 cd/m(2), the maximum external quantum efficiency (EQE) of 2.99% which is relatively comparable to commonly used blue emitters.
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