1. Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode.
- Author
-
Wang Z, Cheng T, Wang F, Bai Y, Bian X, Zhang B, Hayat T, Alsaedi A, and Tan Z
- Subjects
- Aluminum Oxide chemistry, Electrodes statistics & numerical data, Electrons therapeutic use, Quantum Dots chemistry
- Abstract
Stable and efficient red (R), green (G), and blue (B) light sources based on solution-processed quantum dots (QDs) play important roles in next-generation displays and solid-state lighting technologies. The brightness and efficiency of blue QDs-based light-emitting diodes (LEDs) remain inferior to their red and green counterparts, due to the inherently unfavorable energy levels of different colors of light. To solve these problems, a device structure should be designed to balance the injection holes and electrons into the emissive QD layer. Herein, through a simple autoxidation strategy, pure blue QD-LEDs which are highly bright and efficient are demonstrated, with a structure of ITO/PEDOT:PSS/Poly-TPD/QDs/Al:Al2O3. The autoxidized Al:Al2O3 cathode can effectively balance the injected charges and enhance radiative recombination without introducing an additional electron transport layer (ETL). As a result, high color-saturated blue QD-LEDs are achieved with a maximum luminance over 13,000 cd m
-2 , and a maximum current efficiency of 1.15 cd A-1 . The easily controlled autoxidation procedure paves the way for achieving high-performance blue QD-LEDs.- Published
- 2018
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