NOVELTY - A carbazole derivative (I), is new.    USE - New carbazole derivative is used for forming organic layer for organic electric device e.g. organic electroluminescent device, organic solar cell, organophotoreceptor and organic transistor (all claimed).    ADVANTAGE - The device containing organic layer formed using carbazole derivative has high stability, durability and luminous efficiency.    DETAILED DESCRIPTION - A carbazole derivative of formula (I), is new.    Ar1,Ar2=6-60C aryl optionally substituted by deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 1-20C alkoxy, 1-20C alkylamine, 1-20C alkylthiophene, 6-20C arylthiophene, 2-20C alkenyl, 2-20C alkynyl, 3-20C cycloalkyl, 6-60C aryl, deuterium-substituted 6-20C aryl, 8-20C arylalkenyl, silane group, boron group, germanium group or 5-20C heterocyclyl, 5-60C heteroaryl optionally substituted by deuterium, halo, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 8-20C arylamine, 6-60C aryl, deuterium-substituted 6-20C aryl, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclyl, nitrile or acetylene group, and having O, N or S, 1-30C alkoxy optionally substituted by deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, deuterium-substituted 6-20C aryl or 3-60C heteroaryl, 6-30C aryloxyoptionally substituted by deuterium, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 2-30C heterocycloalkyl, 6-60C aryl, deuterium-substituted 6-20C aryl or 3-60C heteroaryl, 1-50C alkyl optionally substituted by 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, deuterium-substituted 6-20C aryl, 8-20C arylalkyl, 8-20C arylalkenyl, 5-20C heterocyclyl, nitrile or acetylene;    or Ar1+Ar2=(unit)saturated aliphatic ring or hetero ring;and    L=6-60C arylene optionally substituted by nitro, nitrile, halo, 1-20C alkyl, 1-20C alkoxy or amino or 5-60C heteroarylene optionally substituted by nitro, nitrile, halo, 1-20C alkyl, 1-20C alkoxy, or amino.    An INDEPENDENT CLAIM is included for organic electric device.