Journal
ORGANIC ELECTRONICS
Volume 13, Issue 4, Pages 586-592Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2012.01.003
Keywords
Solution process; Blue; Phosphorescence; OLED
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology
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We report low voltage driving and highly efficient blue phosphorescence organic light emitting diodes (PHOLEDs) fabricated by soluble process. A soluble small molecule mixed host system consisting of hole transporting 4,4 ',4 '' tris(N-carbazolyl)triphenylamine (TCTA) and bipolar carrier transporting 2,6-bis(3-(carbazol-9-yl)phenyl)pyridine (26DCzPPy) exhibits high solubility with smooth surface properties. Moreover, this small molecule host shows the smoothest morphological property similar to a vacuum deposited amorphous film. A low driving voltage of 5.4 V at 1000 cd/m(2) and maximum external quantum efficiency 14.6% obtained in the solution processed blue PHOLEDs are useful for large area low cost manufacturing. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.
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