G. Grybauskaitė-Kaminskienė “Synthesis, studies and application in OLEDs of new carbazole derivatives, containing 10H-phenothiazine, triphenylsilane, sulfonyl-4-methylbenzene and benzonitrile moieties” doctoral dissertation defence

Author, Institution: Gintarė Grybauskaitė-Kaminskienė, Kaunas University of Technology

Science area, field of science: Technological Sciences, Materials Engineering, T008

Scientific Supervisors:
Assoc. Prof. Dr.Audrius Bučinskas (Kaunas University of Technology, Physical sciences, Chemistry N 003; Technological sciences, Materials engineering T 008) (2017-2018).
Prof. Dr. Gintaras Buika (Kaunas University of Technology, Technological sciences, Chemistry engineering T 005) (2014-2017).

Dissertation Defence Board of Materials Engineering Science Field:
Dr. Šarūnas Meškinis (Kaunas University of Technology, Technological sciences, Materials engineering  – T 008) – chairman,
Dr. Pavel Arsenyan (Latvian Institute of Organic Synthesis, Natural Sciences, Chemistry – N 003),
Prof. Dr. Saulius Grigalevičius (Kaunas University of Technology, Technological sciences, Materials engineering  – T 008),
Assoc. Prof. Dr. Habil. Vidmantas Gulbinas (Centre of Physical and Technological Sciences, Natural Sciences, Physics – N 002),
Prof. Dr. Jolita Ostrauskaitė (Kaunas University of Technology, Technological sciences, Materials engineering – T 008)

The doctoral dissertation is available at the library of Kaunas University of Technology (Donelaičio 20, Kaunas) .

Annotation:
The aim of this work is design, synthesis, evaluation of the properties and estimation of applicability in OLEDs of newly synthesized derivatives of carbazole. The dissertation reviews the recent literature on organic light-emitting diodes with structures containing bicarbazole, acridine, and phenoxazine moieties, evaluating their efficiency prospects. The paper describes the synthesis of novel 9-ethyl-9H-carbazole, bicarbazole and carbazole derivatives containing 10H-phentiazine, triphenylsilane, phosphonyl-4-methylbenzene and benzonitrile moieties and provides a detailed analysis of the properties. Simple and efficient synthesis methods have been selected for the synthesis of the target compounds. The investigation of their thermal, optical, photophysical, electrochemical, photoelectrical and charge transporting properties have been investigated using not only experimental but also computer modeling methods. The best-performing materials have been tested on organic light-emitting diodes. A highly efficient ‘warm-white’ OLED was fabricated, whose electroluminescence was close to candle emission. The best device demonstrated very high brightness of 40900 cd/m² (at 15 V), while the external quantum efficiency reached 18.8%.