NOVELTY - A naphthalene derivative (I), is new.    USE - New naphthalene derivative used in organic electric device e.g. organic electroluminescent device, organic solar cell, organic photoreceptor and organic thin film transistor (all claimed).    DETAILED DESCRIPTION - A naphthalene derivative of formula (I), is new.    R1-R14=e.g. H, deuterium, tritium, 6-60C aryl optionally substituted by halo, 1-60C alkyl, 1-60C alkoxy, 1-60C alkylamine, 6-60C arylamine, 1-60C alkylthiophene, 6-60C arylthiophene, 2-60C alkenyl, 2-60C alkynyl, 3-60C cycloalkyl, 6-60C aryl (optionally substituted by group V1);    group V1=deuterium, 8-60C arylalkenyl, silane, boron, germanium, 5-60C heterocyclyl (all optionally substituted);    m=1-2;    A=O, S, or N(Ar1);    B'=e.g. 6-60C arylene (optionally substituted by halo, 1-60C alkyl, 6-60C arylthiophene, 2-60C alkenyl, 2-60C alkynyl, 3-60C cycloalkyl, 6-60C aryl (optionally substituted by group V1), N(Ar2)p), 4-60C heterocyclyl (all optionally substituted by halo, CN, NO2, 1-60C alkyl, 1-60C alkoxy, 1-60C alkylamine, 6-60C arylamine, 1-60C alkylthio, 2-60C alkenyl, 6-60C aryl optionally substituted by deuterium, silane, boron, germanium or 5-60C heterocyclyl (all optionally substituted) and containing O, N or S), condensed ring of 6-60C aromatic ring and 4-60C aliphatic ring, or silane;    p=0 (when m is 2) or 1;    Ar1,Ar2=6-60C aryl (optionally substituted by halo, 1-60C alkyl, 1-60C alkoxy, 1-60C alkylamine, 6-60C arylamine, 1-60C alkylthiophene, 6-60C arylthiophene, 2-60C alkenyl, 2-60C alkynyl, 3-60C cycloalkyl, 6-60C aryl optionally substituted by group V1), 4-60C heterocyclyl (optionally substituted by halo, CN, NO2, 1-60C alkyl, 1-60C alkoxy, 1-60C alkylamine, 6-60C arylamine, 1-60C alkylthio, 2-60C alkenyl, 2-60C alkynyl, 3-60C cycloalkyl, 6-60C aryl, optionally substituted 5-60C heterocyclyl containing O, N or S);and    L=single bond, 6-60C arylene (optionally substituted by halo, 1-60C alkyl, 2-60C alkenyl, 1-60C alkoxy, 6-60C aryl, 8-60C arylalkenyl, optionally substituted silane, 5-60C heterocyclyl having O, N or S), 4-60C heteroarylene (optionally substituted by halo, 1-60C alkyl, 2-60C alkenyl, 1-60C alkoxy, 6-60C aryl, 8-60C arylalkenyl, optionally substituted silane, optionally substituted 5-60C heterocyclyl containing O, N or S).    Full definitions are given in "DEFINITIONS - Full Definitions" section. An INDEPENDENT CLAIM is included for organic electric device, which consists of an electrode, organic layer containing the compound (I) and another electrode laminated in order.