Abstract: The present invention relates to an organic electroluminescent device comprising at least one light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a host and a phosphorescent dopant; the host comprises plural host compounds; at least a first host compound of the plural host compounds has a structure of a nitrogen-containing heterocyclic linker bonded to a nitrogen atom of a carbazole of an indole-carbazole, indene-carbazole, benzofuran-carbazole, or benzothiophene-carbazole residue; and a second host compound has a carbazole-aryl-carbazole or carbazole-carbazole structure. According to the present invention, by using a specific multi-component host different from the conventional organic electroluminescent device, an organic electroluminescent device of significantly improved lifespan is provided.

Abstract: Provided is a bucket assembly having a grappling member for excavator. The bucket assembly includes: a forward and backward tilting unit for forwardly and backwardly tiling a supporting plate mounted at a boom of the excavator through a first hinge bracket; a rotating unit rotatably disposed under the supporting plate of the forward and backward tilting unit; a driving unit including a supporting frame disposed under the rotating unit, a bucket member and a grappling member mounted to face the bucket member for driving the bucket member and the grappling member using an oil pressure, wherein the supporting frame and the grappling member have a bucket tooth with a hard metal tip and a grappling tooth with a hard metal tip; and a left and right tilting unit mounted at both of the forward and backward tilting unit and the rotating unit to tilt the rotating unit using oil pressure.