| Title |
Development of organic light-emitting diodes based on new wide-band-gap semiconductors |
| Translation of Title |
Organinių šviesos diodų tobulinimas taikant naujus organinius puslaidininkius, pasižyminčius dideliu energetinių lygmenų skirtumu. |
| Authors |
Mahmoudi Sharabiani, Malek |
| Full Text |
|
| Pages |
132 |
| Keywords [eng] |
organic light-emitting diodes ; TADF ; optoelectronic devices |
| Abstract [eng] |
The aim of this work is the characterization of new blue fluorescent emitters for the development and fabrication of efficient OLEDs. 1. Efficient exciplex-based emitters exhibiting TADF with significant RISC rates up to 5.1 × 107 s-1 were designed based on new bicarbazole derivatives substituted by different electron donor moieties (fluoro- or trifluoromethyl). Their applicability was demonstrated for sensing the oxygen and hybrid solution-processable WOLEDs with high color rendering index. 2. The spatial exciton allocation strategy was first time used for WOLEDs based on TADF emitters. The strategy allowed modulation and separation of excitons and charges at the exciton recombination region and carrier recombination region resulting in ca. with twice higher EQE and higher quality of white color for developed OLEDs in comparison to the reference OLEDs. 3. Enhanced TADF efficiency and high reverse inter-system crossing rates from 4.7 × 104 to 2.32 × 106 s−1 were achieved for multicarbazolyl-substituted benzonitriles blue TADF emitters containing a variety of additional acceptors for efficient OLEDs with tunable color variations of blue electroluminescence. 4. The minimization of solid-state solvation and conformation disorder corollaries on the performance of blue TADF emitters by multi-donor-acceptor substitution engineering for doping-free and host-based OLEDs with unusually similar electroluminescent performances. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Doctoral thesis |
| Language |
English |
| Publication date |
2024 |
