NOVELTY - A nitrogen-containing aromatic compound (I), is new.    USE - New nitrogen-containing aromatic compound for organic semiconductor material for thin film for organic electronic device e.g. light emitting device, organic electroluminescent element, thin film transistor and photovoltaic device (all claimed). Uses include but are not limited to liquid crystal display, electronic paper, organic field effect transistor, organic thin film solar cell, information take and sheet-type scanner.    ADVANTAGE - The nitrogen-containing aromatic compound as high charge transfer characteristics. The electronic device using nitrogen-containing compound has excellent luminous efficiency, heat resistance and stability.    DETAILED DESCRIPTION - A nitrogen-containing aromatic compound of formula (I), is new.    L=3-30C aromatic heterocyclyl which does contain 6-30C aromatic hydrocarbyl of m+n valence or 4 or more condensed heterocyclic ring, group derived from 9-30C triarylamine, or group derived from 6-24C diaryl sulfone;    X=N-A, O, S, or Se;    A=1-30C alkyl, 3-30C cycloalkyl, 2-30C alkenyl, 2-30C alkynyl, 3-18C silyl, 2-19C acyl, 3-50C aromatic heterocyclyl which does not contain 6-50C aromatic hydrocarbyl or 4 or more condensed heterocyclic ring;    R=H, 1-30C alkyl, 3-30C cycloalkyl, 2-30C alkenyl, 2-30C alkynyl, 3-30C aromatic heterocyclyl which does not contain 6-30C aromatic hydrocarbyl or 4 or more condensed heterocyclic ring;    m=1-4;    n=0-3;and    m+n=2-4.    INDEPENDENT CLAIMS are included for the following:    (1) organic semiconductor material, which contains nitrogen-containing aromatic compound; and    (2) organic semiconductor thin film, which is formed using organic semiconductor material.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of organic electroluminescent element.    Substrate (1)    Anode (2)    Positive hole injection layer (3)    Positive hole transport layer (4)    Light emitting layer (5)    Electron carrying layer (6)    Cathode respectively (7)