NOVELTY - A benzofluorene-containing compound (I) is new.    USE - New benzofluorene-containing compound is used as light-emitting substance for organic electric device e.g. organic electroluminescent device, organic solar cell, organophotoreceptor, monochrome or white illumination device and organic thin film transistor, for electric device (all claimed).    ADVANTAGE - The organic electric device using the benzofluorene-containing compound has excellent durability, luminous efficiency and color purity, and low driving voltage.    DETAILED DESCRIPTION - A benzofluorene-containing compound of formula (I) is new.    Ar1,Ar2=1-50C alkyl (optionally substituted by H, deuterium, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryl (substituted by deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 2-20C heterocyclyl, acetylene or nitrile), 2-60C heterocyclyl (optionally substituted by H, deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl amine, 6-60C aryl, 6-20C aryl (substituted by deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 2-20C heterocyclyl, nitrile, acetylene or hetero atom chosen from O, N, S, Si or P), 2-20C alkenyl (optionally substituted by H, deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl amine, 6-60C aryl, 6-20C aryl (substituted with deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 2-20C heterocyclyl, nitrile or acetylene), 1-30C alkoxy (optionally substituted by H, deuterium, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryl (substituted by deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 2-20C heterocyclyl, nitrile or acetylene), 6-30C aryloxy (optionally substituted by H, deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-60C aryl, 6-20C aryl (substituted with deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 2-20C heterocyclyl, nitrile or acetylene), 6-30C aryl silyl or 6-60C aryl;    L1,L2=6-60C aryl (optionally substituted by nitro, nitrile, halo, silane, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 2-20C heterocyclyl or amino), fluorenyl (optionally substituted by H, deuterium, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryl (substituted with deuterium), 7-20C arylalkyl, 8-20C aryl alkenyl, 1-50C alkyl, 2-20C heterocyclyl, nitrile or acetylene), 3-60C heteroaryl (optionally substituted by nitro, nitrile, halo, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 2-20C heterocyclyl or amino), or divalent (un)substituted 1-60C aliphatic hydrocarbyl;    m,n=0-4;    R',R"=1-50C alkyl or 6-60C aryl;and    R'+R"=spiro compound.    "Full definitions are given in DEFINITIONS - Full Definitions" section. INDEPENDENT CLAIMS are included for the following:    (1) organic electric device, which has one or more organic layers containing the benzofluorene-containing compound (I); and    (2) electronic device, which has a display device including the organic electric device, and control unit for driving the display device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of organic electroluminescent device. (Drawing includes non-English language text)    Substrate (401)    Positive hole (402)    Hole transport layer (404)    Light-emitting layer (405)    Electron transport layer (406)