We report a reversible three-state and dual color photoluminescence (PL) intensity modulation of quantum dots (QDs) by electrochemically applying voltages on the Prussian blue (PB) substrate. PB acts as the electro-switchable materials because the applied voltage controls the oxidation state of iron ions in PB. Depending on the oxidation states of iron ions and their redox potential, the charge transfer from QDs to PB can be allowed or blocked, acting as a main mechanism of PL intensity modulation of QDs in multistate. Engineering heterostructures of QDs give rise to additional controllability of PL intensity modulation. The CdS shell on top of CdSe core QDs acts as a hole blocking layer, whereas the ZnSe shell acts as an electron blocking layer. With the combination of the applied voltage and its core/shell heterostructure, we could selectively quench or recover PL intensity of two different QDs which gives dual color tunability.
In contrast to traditional OLED displays found in mobile phones and TVs, OLED microdisplays present distinct challenges. Despite their reduced panel size, achieving high resolution is crucial, resulting in pixel sizes of only a few micrometers and gaps between pixels less than 1 micrometer. In this presentation, we will delve into OLED device technology, focusing on achieving high luminance and a wide color gamut, while considering the unique characteristics of microdisplays. A noteworthy demonstration involved a 3000 pixels-per-inch (ppi) OLED microdisplay with a color gamut of 130.2% based on the sRGB standard. This achievement is attributed to a thoughtful combination of light-emitting materials, OLED device structure, and subpixel arrangement.
This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government(MSIT) (No.2022-0-00026, Near-eye light field device technology development for hyper-realistic metaverse service)
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