NOVELTY - An indole compound (I) is new.    USE - New indole compound is used for organic electroluminescent element, organic solar cell, organic photoconductor, organic thin-film transistor, monochromatic light, and white light illuminating device (all claimed).    ADVANTAGE - The organic electroluminescent element containing the indole compound has high thermal resistance, luminous efficiency, low driving voltage, and excellent durability.    DETAILED DESCRIPTION - An indole compound of formula (I) is new.    R1-R11=H, deuterium, tritium, or 1-50C alkyl (optionally substituted by nitrile or acetylene, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl (optionally substituted by deuterium,), 7-20C aralkyl, 8-20C aralkenyl, or 2-20C heterocyclyl), 2-60C heterocyclyl containing heteroatom chosen from O, S, N, Si and P, 2-20C alkenyl, 1-30C alkoxy, 6-30C aryloxy, or 6-30C arylsilyl (all optionally substituted by deuterium, tritium, 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 aralkyl, 8-20C aralkenyl, 2-20C heterocyclyl, nitrile or acetylene), 6-60C arylamine (optionally substituted by deuterium, tritium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, or 6-60C aryl), or 6-60C aryl (optionally substituted by deuterium, tritium, halo, 1-20C alkyl, 1-20C alkoxy, 1-20C alkylamine, 1-20C alkyl thiophene, 6-20C aryl thiophene, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 6-20C aryl, 6-20C aryl substituted with deuterium, 8-20C aralkenyl, or 2-20C heterocyclyl containing silane, boron or germanium);    Ar1=R1 (excluding H, deuterium, tritium and 6-60C arylamine);    A=6-60C arylene, 3-60C heteroaryl (optionally substituted by nitro, nitrile, halo, silane, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, or 2-20C heterocycloalkyl), fluorenyl (optionally substituted by deuterium, tritium, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl optionally substituted with deuterium, 7-20C aralkyl, 8-20C aralkenyl, 1-50C alkyl, 2-20C heterocyclyl, or nitrile), divalent aliphatic hydrocarbyl (optionally substituted by deuterium, tritium, halo, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl optionally substituted by deuterium, 7-20C aralkyl, 8-20C aralkenyl, 1-50C alkyl, or 2-20C heterocyclyl);and    or any of R1-R11 and Ar1=optionally substituted (un)saturated ring.    An INDEPENDENT CLAIM is included for organic electroluminescent element, which consists of organic material layers comprising indole compound.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of organic electroluminescent element. (Drawing includes non-English language text)    Substrate (401)    Positive electrode (402)    Hole transport layer (404)    Light-emitting layer (405)    Electron transport layer (406)    Negative electrode (408)