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As a new generation of display technology, OLED (Organic Light Emitting Diode)) has superior performance than LCD (liquid crystal display) .However, the lifetime of OLED devices, especially the blue OLED device, is short. In this paper, the influence of doping ratio of guest material and the homogeneity of blue light‐emitting layer (EML) on the device lifetime is studied. The data of seven experiments...