Journal
ORGANIC ELECTRONICS
Volume 14, Issue 12, Pages 3493-3499Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2013.09.027
Keywords
Gravure printing; Small-molecule organic light-emitting diode; UHMW polystyrene; Viscosity
Funding
- Project (PrintOLED) of the Leading-Edge Cluster Forum Organic Electronics [2046681601]
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Small-molecule based flexible organic light-emitting diodes (SMOLEDs) were fabricated by gravure printing. In order to modify rheological properties of the functional ink, the green emitter was embedded into an ultrahigh molecular weight polystyrene (UHMW-PS) matrix. The viscosity of the ink was characterized as a function of the small molecule: UHMW-PS weight ratio and solvent type. The gravure printed SMOLEDs exhibited a maximum luminance of 850 cd m(-2), a maximum efficiency of up to 7.7 cd A(-1), and turn on voltage of similar to 3.5 V. The gravure printed SM: UHMW-PS device exhibits similar to 67% higher luminance efficiency comparing to the spin-coated pristine SM device. (C) 2013 Elsevier B. V. All rights reserved.
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