Abstract: An organic light emitting device having a first organic material layer that includes a compound of Chemical Formula 1 and the second organic material layer that includes a compound of Chemical Formula 2,

Abstract: Provided is a heterocyclic compound of Chemical Formula 1: wherein X1 is CR1 or N, X2 is CR2 or N, X3 is CR3 or N, X4 is CR4 or N, Y1 is CR5 or N, Y2 is CR6 or N, Y3 is CR7 or N, Y4 is CR8 or N, Z1 is CR9 or N, Z2 is CR10 or N, Z3 is CR11 or N, and Z4 is CR12 or N, wherein X1 to X4, Y1 to Y4 and Z1 to Z4 are not N at the same time; and at least one of R1 to R12 is Chemical Formula 2: wherein A1 is O, S or Se; L1 is a direct bond, or a substituted or unsubstituted arylene or heteroarylene group; at least one of Ar1 and Ar2 is a substituted or unsubstituted alkyl group, and the rest is a substituted or unsubstituted aryl or heteroaryl group; and the rest are the same as or different from each other, and each independently is hydrogen, deuterium, halogen, cyano, nitro, hydroxyl, carbonyl, ester, imide, amide, or a substituted or unsubstituted: alkyl, cycloalkyl, alkoxy, aryloxy, alkylthioxy, arylthioxy, alkylsulfoxy, arylsulfoxy, alkenyl, silyl, boron, amine, arylphosphine oxide, aryl, or heteroa

Abstract: A novel compound represented by the following Chemical Formula 1, and an organic light emitting device comprising the same.

Abstract: The present disclosure relates to an anode for a lithium-metal battery, a manufacturing method of the same, and a lithium-metal battery including the anode. The anode for a lithium-metal battery includes a complex hierarchical structure current collector which includes an inverted pyramid-shaped micro hole pattern and nanostructures provided within the inverted pyramid-shaped micro hole pattern; and a lithium metal which is electrodeposited on the nanostructure of the current collector. As a result, it is possible to increase the life stability of the battery and increase the coulombic efficiency.

Abstract: A semiconductor memory includes a substrate that includes pass transistor regions, a peripheral circuit structure that includes pass transistors on the pass transistor regions, and a cell array structure on the peripheral circuit structure, the cell array structure including a plurality of cell array regions and a plurality of connection regions that are alternately arranged along a first direction. The cell array structure includes a stack structure including conductive patterns vertically stacked and correspondingly connected to the pass transistors. The stack structure includes stepwise structures on the connection regions. The connection regions of the cell array structure correspondingly overlap the pass transistor regions of the peripheral circuit structure.

Abstract: Provided is a heat pump system including a compressor for compressing a refrigerant the heat pump system including: an input interface configured to receive an input of an authentication code; a display configured to display the authentication code input through the input interface; and a controller to control an operation of the heat pump system according to whether a control program to control the operation is to be activated based on the authentication code input through the input interface.