Inkjet-printed quantum dot-polymer composites for full-color AC-driven displays

Abstract

We introduce a technique for the reliable deposition of intricate, multicolored patterns using a quantum dot (QD) and polymer com-posite and demonstrate its application for robust AC-driven displays with high brightness and saturated colors. The AC electrolumines-cent (AC EL) devices are a well-established technology [1]. Their rel-atively simple fabrication and long operating lifetimes make them desirable for large-area displays; however, a major challenge with AC EL remains finding efficient and stable red phosphors for mul-ticolored displays. Colloidally synthesized QDs are robust, solution-processable lumophores offering tunable and narrowband photolu-minescence across the visible spectrum [2]. By integrating QDs into an AC EL device, we demonstrate patterning of saturated red, green, and blue pixels that operate at video brightness. The concept behind the device operation is optical downconver-sion: red and green QDs absorb blue electroluminescence fro