Abstract: An organic electroluminescence device of an embodiment includes a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode, wherein the emission layer includes a first host and a second host which are different from each other, a first dopant including an organic metal complex containing Ir, Ru, Rh, Pt, Pd, Cu, or Os as a central metal atom, and a second dopant represented by Formula D-2 below, and thereby the organic electroluminescence device may exhibit high luminous efficiency and long service life characteristics.

Abstract: The present disclosure relates to a user terminal to which an external display may be connected, and a control method therefor. The user terminal includes a main display, an interface unit for being connected to the external device equipped with a sub-display, and a controller that controls, in response to detection of the connection with the external device via the interface, a plurality of position icons for specifying a position of the sub-display to be displayed on the main display, and controls, in response to selection of a desired position icon among the plurality of position icons, connection setting of the sub-display to be performed based on the sub-display being disposed at a first desired position corresponding to the selected desired position icon.