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The electrical current leakage and stability are studied for solution OLED with areas of 4.45 mm2, 3×3.2 cm2, and 6×11.5 cm2. All organic layers are deposited by blade coating and initial current leaking defects can be avoided by careful control of the coating conditions. The detrimental burning point caused by a local current short developed after long‐time operation can be avoided by reducing the...