Abstract: An organic electroluminescent element is disclosed. The organic electroluminescent element exhibits low driving voltage and high luminous efficiency at the same time by including a first layer, which is at least two electron transport layers, adjacent to a light-emitting layer and composed of a single compound; and a second layer adjacent to a negative electrode and composed of at least two organic compounds.

Abstract: An apparatus and method for classifying fraudulent advertising users are disclosed. The apparatus includes a processor and a memory storing instructions executable by the processor, in which, when the instructions are executed by the processor, the processor receives user data of users who are first determined to be fraudulent advertising users in relation to advertising fraud of an online advertisement; extracts advertising fraud-related features from the user data; classifies fake users from the users through clustering of the users based on the extracted features; searches for a fraud score of each of remaining users who are not classified as the fake users among the users, using an Internet protocol (IP)-based fraud search service server; and classifies the remaining users into the fake users and genuine users based on the fraud score.

Abstract: An advertising fraud detection apparatus and method are disclosed.

Abstract: The present invention provides an organic electroluminescent device including an electron-leakage suppression layer and a hole-leakage suppression layer adjusted to have predetermined physical properties, in portions of a hole transporting area and an electron transporting area disposed on opposite sides of a light emitting layer, respectively, thereby reducing leakage of electrons and holes and thus improved in terms of characteristics such as a low driving voltage, high luminous efficiency, and long lifespan.

Abstract: An organic electroluminescent device is disclosed. The organic electroluminescent device achieves low driving voltage and high luminous efficiency as well as long lifespan by including an exciton confinement layer (ECL), in which a predetermined physical property is adjusted, in an area of an electron transporting area, including at least two layers, that is adjacent to an emissive layer.

Abstract: An organic electroluminescent device is disclosed. The organic electroluminescent device achieves low driving voltage and high luminous efficiency as well as long lifespan by including an exciton confinement layer (ECL), in which a predetermined physical property is adjusted, in an area of an electron transporting area, including at least two layers, that is adjacent to an emissive layer.

Abstract: The present invention provides an organic electroluminescent device including an electron-leakage suppression layer and a hole-leakage suppression layer adjusted to have predetermined physical properties, in portions of a hole transporting area and an electron transporting area disposed on opposite sides of a light emitting layer, respectively, thereby reducing leakage of electrons and holes and thus improved in terms of characteristics such as a low driving voltage, high luminous efficiency, and long lifespan.