Energy level determination of purine containing blue light emitting organic compounds

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dc.contributor.authorGrzibovskis, Raitis
dc.contributor.authorVembris, Aivars
dc.contributor.authorSebris, Armands
dc.contributor.authorKapilinskis, Zigfrids
dc.contributor.authorTurks, Maris
dc.date.accessioned2020-12-16T06:32:21Z
dc.date.available2020-12-16T06:32:21Z
dc.date.issued2018
dc.description.abstractOrganic light emitting diodes (OLED) have found their applications in the mobile and TV screens. Till now the commercially available diodes are made by expensive thermal evaporation in a vacuum. The costs of OLED fabrication could be decreased by applying low-cost wet casting methods, for example, spin-coating. In this work, we have studied a group of blue light emitting purine derivatives which could potentially be used in OLEDs. The advantage of these compounds is their ability to form amorphous thin films from solutions. All the thin films were prepared by the spincoating method from chloroform solution on ITO glass. The position of hole and electron transport energy levels is important for efficient OLED fabrication. Ionization energy was determined using photoelectron yield spectroscopy. The gap between ionization energy and electron affinity was determined using photoconductivity measurements. Electron affinity (Ea) then was calculated as a difference between ionization energy (I) and photoconductivity threshold value (Eth). Changes in the energy level values depending on the molecule structure were investigated. The position of electron acceptor group strongly affects the gap between ionization energy and electron affinity, while with the help of the attached substitute groups it is possible to alter the ionization energy. Fine “tuning” of the ionization energy values can be achieved by altering the length of the “tail” where the inactive bulky group is attached.en_US
dc.description.sponsorshipInstitute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²en_US
dc.identifier.doi10.1117/12.2307422
dc.identifier.isbn9781510619005
dc.identifier.urihttps://dspace.lu.lv/dspace/handle/7/52987
dc.language.isoengen_US
dc.publisherSPIE - International Society for Optics and Photonicsen_US
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/739508/EU/Centre of Advanced Material Research and Technology Transfer/CAMART²en_US
dc.relation.ispartofseriesOrganic Electronics and Photonics: Fundamentals and Devices;10687 (106871D)
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectResearch Subject Categories::NATURAL SCIENCES:Physicsen_US
dc.subjectOLEDen_US
dc.subjectenergy levelsen_US
dc.subjectphotoelectron emissionen_US
dc.subjectphotoconductivityen_US
dc.subjectpurineen_US
dc.titleEnergy level determination of purine containing blue light emitting organic compoundsen_US
dc.typeinfo:eu-repo/semantics/conferenceObjecten_US
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