Rapid Color Change Process for Perovskite Quantum Dot Light Emitting Diodes
발표자
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초록
내용
We propose a novel all in one process exchanging ligands and halide anions in film state for facile color tuning and patterning of cesium lead halide perovskite colloidal quantum dot (PeQD) light emitting diodes (LEDs). The proposed all in one process significantly enhanced the performances of PeQD LEDs by passivating the PeQD with shorter ligands. In addition, the all in one process was repeated more stably in the film state. We fabricated red, green, and blue LEDs with extremely narrow emission spectra using cesium lead bromide PeQDs and appropriate butylammonium halide solutions. Furthermore, the proposed all in one process in film state facilitated rapid color change in localized areas, thereby aiding in realizing fine patterns of narrow widths (300 µm) using simple contact masks. Consequently, we fabricated various paint over red/green/blue patterns in PeQD LEDs by applying halide solutions additively.