Two researchers from Lviv Polytechnic National University, Prof. Pavlo Stakhira and Prof. Iryna Yaremchuk, have recently concluded their secondments at UAB Nanoversa in Kaunas.
During their visit, they both explored new materials for OLED functional layers and assessed their properties. They each benefitted from a series of training sessions covering a wide range of techniques. Specifically, Pavlo enhanced his proficiency in OLED characteristics analysis by measuring electroluminescence (EL), photoluminescence (PL), decay time, I-V characteristics, and the absorption spectra of films. At the same time, Iryna underwent training to simulate the properties of multilayer periodic structures and nanostructure materials using finite element methods.
While in the lab, Pavlo’s primary research focus was examining the electroluminescent properties of newly synthesized organic material-emitters such as 4-ethyl-3,5-bis[40-(N, N-diphenylamine)biphenyl-4-yl]-4H-1,2,4-triazole. He also combined the compounds TPA-TZ and PO-T2T dye (2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine) to form an exciplex that is characterised by a relatively high energy triplet state. This exciplex is an excited-state complex formed by the interaction between the electron-donating TPA-TZ and the electron-withdrawing PO-T2T. Pavlo analysed the photoluminescence and phosphorescence spectra of these compounds in solid exciplex film form as well as in THF solution at 77K. He found that when TPA-TZ and PO-T2T are combined into solid films, they exhibit a special type of light emission, namely exciplex-type emission. Interestingly, the colour of this light is slightly red-shifted when compared to the light emitted by TPA-TZ or PO-T2T individually.
During her time at UAB Nanoversa, Iryna explored methods to enhance the photoluminescent characteristics of organic-based multilayer structures. She investigated the absorption and concentration of the electromagnetic field in grating-based structures integrated with graphene. Her findings indicated that absorption of the grating structure improves as the slit width narrows and the grating thickness expands. Incorporating graphene monolayers results in the absorption peak shifting towards the long-wave region and a broadening of the absorbance band. She found that maximum absorption is obtained at specific grating thicknesses. Furthermore, thickening the graphene layer tends to a reduce the peak of the absorption spectrum while broadening its full width at half-maximum.
The insights gained from both Iryna’s and Pavlo’s secondments promises to advance research on OLED structures.
During their visit, they both explored new materials for OLED functional layers and assessed their properties. They each benefitted from a series of training sessions covering a wide range of techniques. Specifically, Pavlo enhanced his proficiency in OLED characteristics analysis by measuring electroluminescence (EL), photoluminescence (PL), decay time, I-V characteristics, and the absorption spectra of films. At the same time, Iryna underwent training to simulate the properties of multilayer periodic structures and nanostructure materials using finite element methods.
While in the lab, Pavlo’s primary research focus was examining the electroluminescent properties of newly synthesized organic material-emitters such as 4-ethyl-3,5-bis[40-(N, N-diphenylamine)biphenyl-4-yl]-4H-1,2,4-triazole. He also combined the compounds TPA-TZ and PO-T2T dye (2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine) to form an exciplex that is characterised by a relatively high energy triplet state. This exciplex is an excited-state complex formed by the interaction between the electron-donating TPA-TZ and the electron-withdrawing PO-T2T. Pavlo analysed the photoluminescence and phosphorescence spectra of these compounds in solid exciplex film form as well as in THF solution at 77K. He found that when TPA-TZ and PO-T2T are combined into solid films, they exhibit a special type of light emission, namely exciplex-type emission. Interestingly, the colour of this light is slightly red-shifted when compared to the light emitted by TPA-TZ or PO-T2T individually.
During her time at UAB Nanoversa, Iryna explored methods to enhance the photoluminescent characteristics of organic-based multilayer structures. She investigated the absorption and concentration of the electromagnetic field in grating-based structures integrated with graphene. Her findings indicated that absorption of the grating structure improves as the slit width narrows and the grating thickness expands. Incorporating graphene monolayers results in the absorption peak shifting towards the long-wave region and a broadening of the absorbance band. She found that maximum absorption is obtained at specific grating thicknesses. Furthermore, thickening the graphene layer tends to a reduce the peak of the absorption spectrum while broadening its full width at half-maximum.
The insights gained from both Iryna’s and Pavlo’s secondments promises to advance research on OLED structures.