Fabricating large-area white OLED lighting panels via dip-coating

•Large-area WOLED lighting panels are fabricated through dip-coating process in air.•The higher the withdrawal speed, the thicker the film.•The higher the solution concentration, the less uniform the film becomes.•The dip-coated panel has the same opto-electric performance as the spin-coated panel.•Dip-coating process removes the material pile-up near the metal grids.

Large-area lighting panels based on white organic light-emitting diodes (OLEDs) with emission area of 72 × 72 mm2 have been fabricated in air through dip-coating process. By studying the effects of the solution concentration, the panel withdrawal speed, as well as improving the panel structure, uniform hole transport layer and emitting layer are deposited with appropriate thickness. The 9-point luminance uniformity and the opto-electrical performance of the dip-coated OLED panel are as same as that of the spin-coated panel. However, the spin-coated panel exhibits dim emission at the corner region and the metal grid region due to panel rotation and material pile-up, which the dip-coated panel shows a uniform light emission across the whole panel.

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