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Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes
Joint Authors
Jeon, Woo Sik
Pode, Ramchandra
Diouf, Boucar
Kwon, Jang Hyuk
Source
Advances in Materials Science and Engineering
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-07-10
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Engineering Sciences and Information Technology
Abstract EN
Key factors to control the efficiency in iridium doped red and green phosphorescent light emitting diodes (PhOLEDs) are discussed in this review: exciton confinement, charge trapping, dopant concentration and dopant molecular structure.
They are not independent from each other but we attempt to present each of them in a situation where its specific effects are predominant.
A good efficiency in PhOLEDs requires the triplet energy of host molecules to be sufficiently high to confine the triplet excitons within the emitting layer (EML).
Furthermore, triplet excitons must be retained within the EML and should not drift into the nonradiative levels of the electron or hole transport layer (resp., ETL or HTL); this is achieved by carefully choosing the EML’s adjacent layers.
We prove how reducing charge trapping results in higher efficiency in PhOLEDs.
We show that there is an ideal concentration for a maximum efficiency of PhOLEDs.
Finally, we present the effects of molecular structure on the efficiency of PhOLEDs using red iridium complex dopant with different modifications on the ligand to tune its highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies.
American Psychological Association (APA)
Diouf, Boucar& Jeon, Woo Sik& Pode, Ramchandra& Kwon, Jang Hyuk. 2012. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes. Advances in Materials Science and Engineering،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-498691
Modern Language Association (MLA)
Diouf, Boucar…[et al.]. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes. Advances in Materials Science and Engineering No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-498691
American Medical Association (AMA)
Diouf, Boucar& Jeon, Woo Sik& Pode, Ramchandra& Kwon, Jang Hyuk. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes. Advances in Materials Science and Engineering. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-498691
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-498691