Journal
ORGANIC ELECTRONICS
Volume 32, Issue -, Pages 89-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.02.018
Keywords
Quantum dot; Light-emitting diodes; Cathode interfacial material; Electron/hole-only devices; Charge balance
Funding
- National Research Foundation of Singapore [NRF-CRP11-2012-01]
- NSFC
- MOST
- SCUT
- Guangdong province [2015CB655000, 201101C0105067115, 51173051, U1301243]
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Colloidal quantum dot light-emitting diodes (QLEDs) are reported with improved external quantum efficiencies (EQE) and efficiency roll-off under high current densities by introducing a thermally-evaporated organic cathode interfacial material (CIM) Phen-NaDPO. QLEDs with this new CIM modified Al cathode were fabricated, giving an upwards of 25% enhancement in the EQE relative to the bare Al device. Ultraviolet photoemission spectroscopy (UPS) suggests that this material can effectively lower the work function of Al, therefore facilitating the electron injection in QLEDs. Furthermore, Phen-NaDPO was introduced into the LiF/Al device to afford better balanced hole/electron injection in the emitting layer. Consequently, the QLEDs with the organic CIM/LiF/Al cathode further increased EQE and current efficiency by 44% and 52%, respectively, with higher luminance and lower efficiency roll-off under high current densities. (C) 2016 Elsevier B.V. All rights reserved.
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