NOVELTY - Substituted phenanthridine-3,8-diamine compounds (I) are new.    USE - (I) are useful for organic electroluminescent devices such as an organic LED, an organic solar cell, an organo photoreceptor and an organic thin film transistor, which are useful in an electronic device (all claimed) such as cellular phone, personal digital assistant, electronic dictionary, portable media player, remote controller, navigation system, game console, TV and computers.    ADVANTAGE - (I) have excellent driving characteristic, rapid response speed and color reproduction range, and improves the luminous efficiency, electric current density, brightness, driving voltage, thermal resistance, chromatic purity and lifetime of the device.    DETAILED DESCRIPTION - Substituted phenanthridine-3,8-diamine compounds of formula (I) are new.    R1, Ar1, Ar2 = (a) H, (b) H, D, halo, amino, nitrile, nitro, 1-60C alkyl, 1-60C alkoxy, 1-60C alkylamine, 1-60C alkyl thiophene, 6-60C aryl thiophene, 2-60C alkenyl, 2-60C alkynyl, 3-60C alkenyl, 6-60C aryl, 6-60C aryl substituted with deuterium, 8-60C alkenyl aryl, optionally substituted silane, optionally substituted boron, optionally substituted germanium, optionally substituted 2-20C heterocyclic or optionally substituted 6-60C aryl, (c) H, D, halo, 1-60C alkyl, 2-60C alkenyl, 1-60C alkoxy, 6-60C arylamine, 6-60C aryl, deuterium-substituted 6-60C aryl, 7-60C alkylaryl, 8-20C alkenyl aryl, 2-20C heterocyclic, nitrile, acetylene or 2-60C heterocyclic optionally substituted with heteroatoms including O, N, S or Si, (d) H, D, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C alkenyl, 6-60C aryl, deuterium-substituted 6-20C aryl, 2-20C heterocyclic or optionally substituted 1-30C alkoxy, (e) H, D, halo, amino, nitrile, nitro, 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 3-30C cycloalkyl, 6-60C aryl, deuterium-substituted 6-20C aryl, 2-20C heterocyclic or optionally substituted 6-30C aryloxy or (f) 1-20C alkyl, 2-20C alkenyl, 1-20C alkoxy, 6-20C aryl, deuterium-substituted 6-20C aryl, 7-20C alkylaryl, 8-20C arylalkenyl, 2-20C heterocyclic, nitrile or optionally substituted 1-50C alkyl, where Ar1 and Ar2 form optionally saturated ring.    INDEPENDENT CLAIMS are included for:    (1) an organic electroluminescent device comprising an organic layer including (I); and    (2) an electronic device comprising the organic electroluminescent device and a control unit for driving the display device.