Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications

Amruth C, Beata Luszczynska, Marek Zdzislaw Szymanski, Jacek Ulanski, Ken Albrecht, Kimihisa Yamamoto

Research output: Contribution to journalArticle

Abstract

This study presents the inkjet printing of a novel OLED device with fully solution-processed organic layers that employ TADF material as an emitting layer. The ink was formulated using new TADF material, triazine core carbazole dendrimers with tert-butyl group at the periphery (tBuG2TAZ), dissolved in a mixture of two non-chlorinated solvents. The influence of the print resolution and the substrate temperature on morphology of the printed films was studied and optimized in ambient conditions. The optimized TADF dendrimer layer was then incorporated in the OLEDs as the emitting layer. The best-printed OLEDs exhibited a maximum current efficiency of 18 cd/A and maximum luminance of 6900 cd/m2. Such values are comparable to the values obtained in spin coated devices made of the same TADF dendrimer. Further, the mobility of charge carriers extracted from transient electroluminescence measurements of printed OLEDs, when compared to reference OLEDs made by spin coating technique, showed similar values. Finally, we have demonstrated the possibility of patterning of emission the area of complex shapes merely by selectively printing the emission layer. These results demonstrate the potential application of the new dendrimer TADF emitters for the fabrication of efficient OLEDs by an inkjet printing technique.

Original languageEnglish
Pages (from-to)218-227
Number of pages10
JournalOrganic Electronics
Volume74
DOIs
Publication statusPublished - Nov 2019

Fingerprint

Dendrimers
dendrimers
Organic light emitting diodes (OLED)
printing
Printing
Fluorescence
fluorescence
carbazoles
inks
Triazines
luminance
Coating techniques
electroluminescence
Spin coating
Electroluminescence
coating
charge carriers
Charge carriers
emitters
Ink

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications. / C, Amruth; Luszczynska, Beata; Szymanski, Marek Zdzislaw; Ulanski, Jacek; Albrecht, Ken; Yamamoto, Kimihisa.

In: Organic Electronics, Vol. 74, 11.2019, p. 218-227.

Research output: Contribution to journalArticle

C, Amruth ; Luszczynska, Beata ; Szymanski, Marek Zdzislaw ; Ulanski, Jacek ; Albrecht, Ken ; Yamamoto, Kimihisa. / Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications. In: Organic Electronics. 2019 ; Vol. 74. pp. 218-227.
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