Enhanced life time and suppressed efficiency roll-off in phosphorescent organic light-emitting diodes with multiple quantum well structures

• Main Authors: Ja-Ryong Koo, Seok Jae Lee, Gun Woo Hyung, Dong Whan Im, Han Sung Yu, Jung-Hwan Park, Kum Hee Lee, Seung Soo Yoon, Woo Young Kim, Young Kwan Kim
• Format: Article
• Language: English
• Published: AIP Publishing LLC 2012-03-01
• Series: AIP Advances
• Online Access: http://dx.doi.org/10.1063/1.3679428

We demonstrate red phosphorescent organic light-emitting diodes (OLEDs) with multiple quantum well structures which confine triplet exciton inside an emitting layer (EML) region. Five types of OLEDs, from a single to five quantum wells, are fabricated with charge control layers to produce high efficiencies, and the performance of the devices is investigated. The improved quantum efficiency and lifetime of the OLED with four quantum wells, and its suppressed quantum efficiency roll-off of 17.6%, can be described by the increased electron–hole charge balance owing to the bipolar property as well as the efficient triplet exciton confinement within each EML, and by prevention of serious triplet–triplet and/or triplet–polaron annihilation as well as the Förster self-quenching due to charge control layers.