Electrical and Optical Characterization of Organic LEDs with Different Electron Emission Layers
Φόρτωση...
Ημερομηνία
Συγγραφείς
Μασκανάκη, Αικατερίνη
Maskanaki, Aikaterini
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Φυσικής
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Organic Light Emitting Diodes (OLEDs) consist of one or more organic layers, polymer or not, which are placed between two electrodes; the anode (usually glass with a thin layer of Indium Tin Oxide, ITO, on top) and the cathode (a metal with low work function, e.g. aluminum). After applying voltage on the electrodes, electrons and holes are injected in the organic layer, and when they get close enough, they form an excited state, the exciton. The exciton’s annihilation results in photon emission whose wavelength depends on the energy bandgap of the emissive layer (polymer, small organic molecule or transition metal complex). Choosing the right organic materials and constructing the diode properly are of highest importance in order to create high
performance OLEDs.
Organic light emitting diodes (OLEDs) are attractive for display applications because
of their high brightness, low driving voltage and tunable color. As a result, they are commonly used as a promising technology for solid state lighting and flat panel displays. However, the efficiency and stability of those OLEDs depend on many factors, such as the properties of the used materials and their interfaces with the electrodes. In order to improve the performance of OLEDs it is vital to incorporate carrier transporting interlayers thus reducing the charge energy barrier at the selected electrode/organic emissive layer. Luminance is severely affected by operation time, as it degrades for reasons yet to be completely understood. An occurring explanation would be that electrical aged OLEDs have generated deep interface states and as a result the interfaces need more time to charge.
The aim of the present work is to study the electrical characteristics of OLEDs with different materials used as an Electron Transport Layer (ETL) and the effects of deep electron traps. Characteristic curves were obtained simultaneously on fresh or electrically stressed devices to investigate both the current conduction mechanisms as
well as the evolution of deep electron traps that affect the turn on voltage and the overall quality of the tested OLEDs. Results show that incorporating an ETL
improves the device characteristics and eliminates the generated electron traps.
Περιγραφή
Λέξεις-κλειδιά
Organic Light Emitting Diodes, Electrical Characterization, Semiconductor Physics, Οργανικές Δίοδοι Εκπομπής Φωτός, Ηλεκτρικός Χαρακτηρισμός, Φυσική Ημιαγωγών
Θεματική κατηγορία
Solid State Physics, Φυσική Στερεάς Κατάστασης
Παραπομπή
Σύνδεσμος
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Φυσικής
Όνομα επιβλέποντος
Evangelou, Evangelos
Εξεταστική επιτροπή
Evangelou, Evangelos
Evangelakis, Georgios
Avgeropoulos, Apostolos
Evangelakis, Georgios
Avgeropoulos, Apostolos
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών
Πίνακας περιεχομένων
Χορηγός
Βιβλιογραφική αναφορά
Ονόματα συντελεστών
Αριθμός σελίδων
121 p.
Λεπτομέρειες μαθήματος
Συλλογές
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Άδεια Creative Commons
Άδεια χρήσης της εγγραφής: Attribution-NonCommercial-NoDerivs 3.0 United States