Journal
ELECTRONIC MATERIALS LETTERS
Volume 9, Issue 6, Pages 821-824Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s13391-013-6024-4
Keywords
blue phosphorescent organic light-emitting diodes; multiple quantum well; triplet exciton confinement
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Funding
- Hallym University Research Fund [HRF-201303-005(II)]
- Engineering Research Center Program of the National Research Foundation through a grant from the Korea Ministry of Education, Science, and Technology [20100009882]
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We demonstrate a multiple quantum well (MQW) structure with charge control layers (CCLs) to produce highly efficient blue phosphorescent organic light-emitting diodes (OLEDs). Three types of devices (A, B, and C) were fabricated with the following emitting layer structures while maintaining the thickness of the EMLs: host-emitter doping layers, nondoping layers, and CCLs. Triplet energies in such MQW devices were confined at the EMLs. The properties of a device with an MQW demonstrated a maximum luminous efficiency and external quantum efficiency of 18.33 cd/A and 9.47%, respectively. The device also showed a reduction in the turn-on voltage from 3.5 V to 2.5 V and an enhancement of the power efficiency. The described MQW device concept is considered to be useful for future OLED displays and light applications.
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