Surface‐Passivated Cesium Lead Halide Perovskite Quantum Dots: Toward Efficient Light‐Emitting Diodes with an Inverted Sandwich Structure
Citations Over TimeTop 10% of 2018 papers
Abstract
Abstract In recent years, metal‐halide perovskite quantum dots (QDs) have been broadly applied in optoelectronic fields due to their fascinating characteristics, such as high photoluminescence quantum yields, tunable bandgaps, and low‐cost solution processing. Here, a facile ligand‐exchange strategy is employed for the fabrication of CsPbBr 3 QDs capped with di‐dodecyl dimethyl ammonium bromide. It is demonstrated that the treated QDs' film becomes more compact with higher electron mobility and shorter lifetime. Besides, a reduced conduction band minimum value (0.28 eV) of perovskite QDs' film provides an efficient electron injection to them from ZnO nanoparticles. Through using the well‐passivated QDs' film, electroluminescence QD light‐emitting diode (QLED) devices with an indium tin oxide/ZnO/CsPbBr 3 QDs/MoO 3 /4, 4′‐bis(carbazole‐9‐yl)biphenyl/Al inverted sandwich structure are achieved. The as‐prepared QLED device exhibits a maximum current efficiency of 0.62 cd A −1 and an external quantum efficiency of 0.58%, which is nearly nine times higher than that of the device based on unmodified QDs. More importantly, the stability testing results demonstrate that the QLED can be operated for more than 20 min under ambient conditions without any encapsulation. This provides an alternative route for highly efficient perovskite‐based LED with inverted sandwich structures.
Related Papers
- → Significant Quantum Efficiency Enhancement of InGaN Red Micro-Light-Emitting Diodes with a Peak External Quantum Efficiency of up to 6%(2023)44 cited
- → Research Status of Recovery of Indium from Indium-Tin Oxide (ITO) Targets(2019)8 cited
- → Cleaning Effect of Indium-Tin-Oxide Substrates on The Electroluminescent Characteristics of Alq3(2001)1 cited
- → On the temperature dependence of the efficiency of electroluminescence(2019)1 cited
- → Determination of photo- and electroluminescence quantum efficiency of semiconducting polymers(2002)