Abstract
Hybrid electroluminescence (EL) devices with mixed emission layers (EMLs) were developed to achieve balanced peaks from red quantum dots (QDs) and blue phosphorescent small molecules. The EML was prepared by mixing QDs and small molecules in an organic solvent, and then adding polystyrene to disrupt the aggregation of the host material. These unique bichromatic devices exhibited two distinct EL peaks with similar intensities over 10 V, and the voltage dependent EL spectra were investigated systematically. These hybrid EL devices showed a maximum luminance of 1057.7 cd/m2 and a current efficiency of 2.45 cd/A. These results indicate that the unique mixed EMLs have potential for use as white devices using fewer fabrication steps.
Highlights
Colloidal quantum dots (QD) have an adjustable emission wavelength, through size-control, with high color purity and their outer organic ligands make the fabrication process cost effective by the solution process [1,2,3,4]
Studies on white-emitting quantum dot light-emitting diodes (QLEDs) have been limited owing to the structural complexity of the device and the difficulty in simultaneous multi-emission
Other attempts using mixed emission layers (EMLs) using more than two QDs have been made, but the inevitable energy loss to adjacent QDs is difficult to control [10,11]
Summary
Colloidal quantum dots (QD) have an adjustable emission wavelength, through size-control, with high color purity and their outer organic ligands make the fabrication process cost effective by the solution process [1,2,3,4]. For this reason, QDs are promising semiconductor emitters for the future display industry, and the performance of quantum dot light-emitting diodes (QLEDs) is comparable with that of organic light-emitting diodes (OLEDs) because of the advantages of a narrow emission line and enhanced electroluminescence (EL) characteristics [5,6,7]. Studies about organic and inorganic hybridization for white EL have been limited
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