NOVELTY - A fused aromatic compound (I) is new.    USE - New fused aromatic compound used for organic electronic element for electronic device e.g. organic electroluminescent device, organic solar cell, organophotoreceptor, organic transistor, and monochrome or white illumination device (all claimed). Uses include but are not limited to mobile communication terminal, personal digital assistant, electronic dictionary, remote control, game console, television, computers and cellular phone.    ADVANTAGE - The fused aromatic compound provides electronic device with excellent luminous efficiency and durability, and low drive voltage.    DETAILED DESCRIPTION - A fused aromatic compound of formula (I) is new.    m=0-4;    R1=deuterium, halo, 6-60C aryl, fluorenyl, 2-20C heterocyclyl having hetero atom chosen from O, N, S, Si and P, 3-60C alicyclic group, 6-60C fused ring group, 1-50C alkyl, 2-20C alkenyl, 2-20C alkynyl, 1-30C alkoxy or 6-30C aryloxy;    X=S or O;    Y1,Y4=CRa or N;    Y2,Y3=CRb or N;    Ra=H, D, -L1-Ar1;    Rb=H, D or -L2-Ar2;    Ar1,Ar2=6-60C aryl, fluorenyl, 3-60C alicyclic group or 6-60C fused ring group, 2-60C heterocyclyl having hetero atom chosen from O, N, S, Si and P, 1-50C alkyl, 2-20C alkenyl, 2-20C alkynyl, 1-30C alkoxy or 6-30C aryloxy;and    L1, L2=single bond, or 6-60C aryl, fluorenyl, 2-60C heterocyclyl having hetero atom chosen from O, N, S, Si and P, fused ring group having 2 6-60C aryl and 3-60C alicyclic ring, or divalent aliphatic hydrocarbyl (all optionally substituted by D, H, halo, silyl, siloxane group, boronyl, germanyl, cyano, nitro, 1-20C alkyl-arylthio, 1-20C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 6-20C aryl substituted by heavy hydrogen, fluorenyl, 2-20C heterocyclyl, 3-20C cycloalkyl, 7-20C arylalkyl or 8-20C arylalkenyl).    (i) When m is 2 or more, 2 or more R1 are coupled to form ring; (ii) R1 does not form a ring, when R1 are same; (ii) At least one of Y1 and Y4, and Y2 and Y3 are N; and (iv) The aryl, fluorenyl, heterocyclyl, fused ring group, alkyl, alkenyl, alkoxy, aryloxy of R1, Ar1 and Ar2 are optionally substituted by D, H, halo, silyl, siloxane group, boronyl, germanyl, cyano, nitro, 1-20C alkyl-arylthio, 1-20C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 6-20C aryl substituted by heavy hydrogen, fluorenyl, 2-20C heterocyclyl, 3-20C cycloalkyl, 7-20C arylalkyl or 8-20C arylalkenyl. An INDEPENDENT CLAIM is included for organic electronic element.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of organic electroluminescent device.    Organic electroluminescent device (100)    Substrate (110)    Anode (120)    Hole injection layer (130)    Hole transport layer (140)