Hybrid color conversion control using OLED and perovskite emitters

Perovskites is a very promising material that is being extensively studied at the bulk and nanosize scales because it has outstanding optical properties, including high quantum efficiency and narrow emission spectra. To realize a full-color display in the research field of perovskites or perovskite-structured quantum dots (PeQDs), the development of white-light-emitting devices that operate by emitting light of three primary colors (red, green, and blue) has emerged as an active research topic. In this presentation, we report for the first time three-color white-light emission with high brightness from white-emitting PeQD organic light-emitting diodes (WPeQD-OLEDs) fabricated using a PeQD material and organic emitters. The electroluminescence (EL) spectra of the WPeQD-OLEDs showed EL maximum peaks at 460, 527, and 640 nm; the CIE color coordinates of the emitted light were (0.33, 0.40). The EL results confirmed that the maximum luminance was 49,000 cd m-2 and the maximum luminance efficiency and power efficiency were 4.48 cd A-1 and 2.16 lm W-1. Also, we achieved a new hybrid pink device of perovskite red QD (PRQD) and organic blue emitter (OBE) which have different emission mechanisms in bilayered LED devices. It has pink emission, CIE coordinate of (0.331, 0.204) which cannot be provided by a single emitter.