An organic electroluminescent device includes first and second substrates facing and spaced apart from each other, the first and second substrates including a pixel region; a gate line on an inner surface of the first substrate; a data line crossing the gate line; a switching thin film transistor connected with the gate line and the data line; a driving thin film transistor connected with the switching thin film transistor; a power line connected with the driving thin film transistor; a first electrode on an inner surface of the second substrate; a first sidewall and a second sidewall on the first electrode at a boundary of the pixel region, the first sidewall and the second sidewall spaced apart from each other; an electroluminescent layer on the first electrode in the pixel region; a second electrode on the electroluminescent layer in the pixel region; and a connection electrode electrically connected to the first and second substrates.