Fig. 1

Design and fabrication of organic printed RGB microlaser pixel arrays. a Schematic illustration of the fabrication of organic RGB microlaser pixel arrays by ultrasonic vibration-assisted inkjet printing. The process begins with the filling of a hollow glass needle with the organic ink solution via capillary action. The solution is subsequently ejected from the glass needle under the assistance of ultrasonic vibration and then dropped onto a hydrophobic substrate. After printing the red-emissive material, green- and blue-emissive materials were printed in the same way with precise alignment. b Image of large-area ordered optical structures. The scale bar is 5 mm. c, d Microscopy images of the printed RGB pixel array showing uniform size and a well-defined pattern. The scale bars are 50 and 20 μm, respectively. e Fluorescence microscopy image of the printed RGB pixel under UV light radiation (330–380 nm). The scale bar is 20 μm