Enhanced electroluminescence in fully printable powder electroluminescent device with flexible invisible silver‐grid transparent electrode

Powder electroluminescent devices (PELDs) have a high potential for commercial application because of flat light emission devices and simple printing process fabrication with low‐cost production, without semiconductor processes using vacuum and plasma. In conventional PELDs, indium tin oxide (ITO) has been used as a transparent electrode. However, ITO is unfavourable in flexible electronic devices due to its intrinsic brittleness. The authors evaluated the current and luminance characteristics of PELDs prepared on gravure offset‐printed invisible silver‐grid (Ag‐grid) electrodes that were laminated with and without poly(3,4‐ethylenedioxythiophene):poly(styrenesulphonate) (PEDOT:PSS) transparent electrodes. The PELD on the Ag‐grid laminated with PEDOT:PSS electrode shows the maximum luminance of ∼250 cd/m 2 at 200 μm spacing, which is five‐fold greater than the luminance of PELD without PEDOT:PSS electrode lamination.