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: A document scanning method and apparatus having an editing function to edit a specific area of a document by defining an editing area of a page to be scanned and then converting the scanned document data of the editing area into a desired form, and a multi functional peripheral using the method. The document scanning method includes inputting the editing area of the page to be scanned, scanning document data from the page, extracting data corresponding to the editing area from the scanned document data, and editing the extracted data.

Abstract: A document scanning method and apparatus having an editing function to edit a specific area of a document by defining an editing area of a page to be scanned and then converting the scanned document data of the editing area into a desired form, and a multi functional peripheral using the method. The document scanning method includes inputting the editing area of the page to be scanned, scanning document data from the page, extracting data corresponding to the editing area from the scanned document data, and editing the extracted data.