Alternating current-driven, white field-induced polymer electroluminescent devices with high power efficiency

A solution-processed, all-phosphor, three-color (i.e., blue, green, and red), alternating current-driven white field-induced polymer electroluminescent device (WFIPEL), with low operational voltage, high luminance, high efficiency, high color-rendering index (CRI), and excellent color-stability, was demonstrated. The devices employed poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) dielectric modified by single-walled carbon nanotubes as the insulating layer to further improve the dielectric characteristics. The resulting WFIPEL devices show significant improvements in performance. Specifically, the devices exhibit a low turn-on voltage of 10 V, a maximum luminance of 7210 cd m−2, a maximum current efficiency and power efficiency of 33.8 cd A−1 and 10.5 lm W−1, and a CRI of 82. The power efficiency is even 10 times higher than the highest previous report (1 lm W−1).106