Stepan Kutsiy and Andriy Fechan from Lviv Polytechnic National University have recently been on a short secondment to UAB “Nanoversa”, a company situated within Kaunas University of Technology.
They each conducted research on a different type of organic fluorescent material with potential applications for new-generation light sources. While Andriy worked on materials with luminescent impurities for use in organic lasers, Stepan focused on thermally activated delayed fluorescence (TADF) compounds for use in organic light-emitting devices (OLEDs).
Stepan investigated the kinetic and photophysical properties of newly synthesised TADF molecules. He verified the presence of the TADF effect in these molecules by measuring their photoluminescence and decay times at ultralow temperatures. Based on these compounds, he then produced blue-emitting OLED structures using the thermovacuum deposition method. He found that these OLED devices exhibited high quantum efficiency and strong brightness levels which speaks to their high quality.
During this time, Andriy worked on optimising the system parameters of a drop of luminescent impurity within a cholesteric liquid crystal dispersed in glycerol. His research enhances our understanding of how a liquid crystal drop-glycerin system can be applied to return zero (RZ) lasers. During his visit, Andriy analysed the spectral and luminescent characteristics of this system. He also helped develop a method for creating the system by establishing the relationship between the procedure for obtaining the drops, the duration of mixing and the size of the drops. Additionally, he investigated the temperature drift of the cholesteric liquid crystal parameters in the liquid crystal-glycerol system. Understanding how temperature can affect this system is crucial for determining how it can be used in real-world applications.
Later this year, the two Ukrainian researchers anticipate continuing their research work with follow-up secondments to Nanoversa.
They each conducted research on a different type of organic fluorescent material with potential applications for new-generation light sources. While Andriy worked on materials with luminescent impurities for use in organic lasers, Stepan focused on thermally activated delayed fluorescence (TADF) compounds for use in organic light-emitting devices (OLEDs).
Stepan investigated the kinetic and photophysical properties of newly synthesised TADF molecules. He verified the presence of the TADF effect in these molecules by measuring their photoluminescence and decay times at ultralow temperatures. Based on these compounds, he then produced blue-emitting OLED structures using the thermovacuum deposition method. He found that these OLED devices exhibited high quantum efficiency and strong brightness levels which speaks to their high quality.
During this time, Andriy worked on optimising the system parameters of a drop of luminescent impurity within a cholesteric liquid crystal dispersed in glycerol. His research enhances our understanding of how a liquid crystal drop-glycerin system can be applied to return zero (RZ) lasers. During his visit, Andriy analysed the spectral and luminescent characteristics of this system. He also helped develop a method for creating the system by establishing the relationship between the procedure for obtaining the drops, the duration of mixing and the size of the drops. Additionally, he investigated the temperature drift of the cholesteric liquid crystal parameters in the liquid crystal-glycerol system. Understanding how temperature can affect this system is crucial for determining how it can be used in real-world applications.
Later this year, the two Ukrainian researchers anticipate continuing their research work with follow-up secondments to Nanoversa.