Low-molecular-weight triphenylamino and carbazolyl group-containing derivatives for organic light-emitting diodes

Monday, October 2, 2017 - 14:00
Dissertation Defence Hall (K. Donelaičio St. 73- 403 room)

Author, Institution: Daiva Tavgenienė, Kaunas University of Technology

Science Area, Field of Science: Technological Sciences, Materials Engineering – 08T

Summary of the Doctoral Thesis: Summary

Scientific Supervisor: Prof. Dr. Saulius GRIGALEVIČIUS (Kaunas University of Technology, Technological Sciences, Materials Engineering – 08T).

Dissertation Defence Board of Materials Engineering Science Field:
Dr. Viktoras GRIGALIŪNAS (Kaunas University of Technology, Technological Sciences, Materials Engineering, 08T) – chairman;
Assoc. Prof. Dr. Mindaugas ANDRULEVIČIUS (Kaunas University of Technology, Technological Sciences, Materials Engineering, 08T);
Prof. Dr. Habil. Albertas MALINAUSKAS (Center for Physical Sciences and Technology, Physical Sciences, Chemistry, 03P);
Dr. Jūratė SIMOKAITIENĖ (Kaunas University of Technology, Physical Sciences, Chemistry, 03P);
Dr. Aivars VEMBRIS (University of Latvia, Technological Sciences, Materials Engineering, 08T).

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio g. 20,Kaunas)


Organic electroluminescent materials have many advantages when compared with their inorganic counterparts and, therefore, they have a wide range of potential applications in communications, information display, illumination, and so on. Chromophores containing carbazolyl moieties are synthesized using rigid and flat structures of aromatic linkage for connecting the rings of carbazole in low-molecular-weight hosts. Compounds are prepared by changing the connection positions of substitution and are widely used as effective hosts for phosphorescent organic light emitting diodes. Triphenylamine is also widely used in the synthesis of various types of hosts. An efficient triphenylamine conjugated π electron system exhibits a high triplet energy  (3.04 eV) and a high HOMO level (~ 5.3 eV). New carbazole-based derivatives containing different electronically isolated fragments in their structures were synthesized and characterized in this dissertation. These compounds were effective host materials for organic light-emitting diodes. This was confirmed by the use of these compounds in effective green and blue phosphorescent light-emitting diodes. Also, carbazole and triphenylamine compounds containing 1-phenylphenanthro[9,10-d]imidazole fragments were synthesized and characterized. It was confirmed that these compounds are effective hosts for red electrophosphorescenct organic light-emitting diodes.