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Gravure printed flexible small-molecule organic light emitting diodes

Authors
Journal
Organic Electronics
1566-1199
Publisher
Elsevier
Volume
14
Issue
12
Identifiers
DOI: 10.1016/j.orgel.2013.09.027
Keywords
  • Gravure Printing
  • Small-Molecule Organic Light-Emitting Diode
  • Uhmw Polystyrene
  • Viscosity

Abstract

Abstract 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 850cdm−2, a maximum efficiency of up to 7.7cdA−1, and turn on voltage of ∼3.5V. The gravure printed SM:UHMW-PS device exhibits ∼67% higher luminance efficiency comparing to the spin-coated pristine SM device.

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