Characterisation of semiconducting polymers and fabrication of OLEDs
Translated title
Karakterisering af halvledende polymer og fabrikation af OLED'er
Author
Hygum, Morten Arnfeldt
Term
4. term
Education
Publication year
2012
Abstract
This master’s thesis investigates the physics of organic light-emitting diodes (OLEDs) and characterizes selected conjugated polymers to support device fabrication. A density functional theory (DFT) study of the polymers indicates semiconducting behavior and low effective masses for charge carriers. Building on these findings, OLEDs were fabricated using a simple spin-coating process with the goal of achieving long operational lifetimes, but the devices reached lifetimes of only about one hour. The short lifetime is attributed to uneven layers, likely caused by the solvent used during spin-coating. The thesis also outlines key aspects of OLED operation—including charge injection, transport, luminescence, and degradation—to contextualize the experimental results and illustrate how molecular electronic properties relate to practical device performance.
Denne kandidatafhandling undersøger fysikken bag organiske lysdioder (OLEDs) og karakteriserer udvalgte konjugerede polymerer som grundlag for enhedsfabrikation. En DFT-undersøgelse af polymererne viser halvledende egenskaber og lave effektive masser for ladningsbærere. Med udgangspunkt i disse fund er der fremstillet OLEDs ved en enkel spincoating-proces med målet om lang levetid, men enhederne opnåede kun en levetid tæt på en time. Den korte levetid tilskrives ujævne lag, sandsynligvis forårsaget af det anvendte opløsningsmiddel under spincoating. Afhandlingen gennemgår desuden centrale aspekter af OLED-funktion, herunder ladningsinjektion, transport, luminescens og degradering, for at sætte de eksperimentelle resultater i perspektiv og belyse, hvordan molekylære elektroniske egenskaber påvirker praktisk enhedsydelse.
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