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Inkjet printing of thermally activated delayed fluorescence (TADF) dendrimer for OLEDs applications
Lodz Univ Technol, Poland..
Lodz Univ Technol, , Poland..
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013). Örebro University, Sweden.ORCID iD: 0000-0003-2992-4330
Lodz Univ Technol, Poland..
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2019 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 74, p. 218-227Article in journal (Refereed) Published
Abstract [en]

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/m(2). 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.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2019. Vol. 74, p. 218-227
Keywords [en]
Organic light emitting diode, Inkjet printing, Thermally activated delay fluorescence, Large area printed electronics, Transient electroluminescence, Emission area patterning
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-75096DOI: 10.1016/j.orgel.2019.07.011ISI: 000485015600031OAI: oai:DiVA.org:kau-75096DiVA, id: diva2:1358160
Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-28Bibliographically approved

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Szymanski, Marek Zdzislaw

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