NOVELTY - A naphthacene tetracarboxylic acid diimide compound (I) is new.    USE - New naphthacene tetracarboxylic acid diimide compound is used as light absorbing material and electron-transporting material in organic light-emitting device, organic thermochromism device, organic field effect transistor and organic solar cell (all claimed).    DETAILED DESCRIPTION - A naphthacene tetracarboxylic acid diimide compound of formula (I) is new.    R1-R10=H, (un)substituted 1-30C alkyl e.g. optionally substituted methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, t-butyl, amyl, hexyl, heptyl, octyl, nonyl and decyl, 1-30C alkoxy e.g. optionally substituted methoxy, ethyoxy, propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy, t-butoxy, pentyloxy, hexaoxy, heptoxy, octoxy, nonyloxy and decyloxy, 3-30C cycloalkyl e.g. optionally substituted cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl or cyclodecyl, 5-30C aryl e.g. (un)substituted phenyl, naphthyl, anthryl, phenanthryl, tetracenyl, pentacenyl, hexacenyl, pyrenyl, indenyl, biphenyl and fluorenyl, 1-30C alkylaryl, 1-30C alkylheteroaryl e.g. optionally substituted pyrryl, pyrazinyl, pyridyl, indolyl, isoindolyl, furyl, benzofuryl, isobenzofuryl, quinolyl, 1-isoquinolyl, quinoxalinyl, carbazolyl, phenanthridinyl, acridinyl, phenanthrolinyl, phenazinyl, phenothiazinyl, phenothiazinyl, phenoxazinyl, oxazolyl, furazanyl and thienyl, 1-30C alkylheterocyclyl e.g. optionally substituted thienyl, furyl, pyranyl, phenoxathiinyl, pyrryl, imidazolyl, pyrazolyl, pyridyl, pyrazinyl, pyrimidyl, pyridazinyl, indolizinyl, indolyl, isoindolyl, indazolyl, purinyl, quinolizidinyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, pteridyl, carbazolyl, carbolinyl, phenanthridinyl, phenanthrolinyl, acridinyl, phenazinyl, thiazolyl, phenothiazinyl, oxazolyl, phenoxazinyl, oxazolyl, oxadiazolyl, furazanyl, dithienopyrrolyl, tribenzothienyl, benzoxazolyl, benzimidazolyl, benzothiophenyl, benzothiazolyl, benzothiophenyl, benzofuryl, benzopyranyl, benzophenoxathiinyl, benzopyrryl, benzimidazolyl, benzopyrazolyl, benzopyridyl, benzopyrazinyl, benzopyrimidyl, benzopyridazinyl, benzoindolizinyl, benzoindolyl, benzoindazolyl, benzopurinyl, benzoquinolizidinyl, benzoquinolyl, benzoquinolinyl, benzophthalazinyl, benzonaphthyridinyl, benzoquinoxalinyl, benzopteridyl, benzocarbazolyl, benzocarbolinyl, benzophenanthridinyl, benzophenanthrolinyl, benzoacridinyl, benzophenazinyl, benzothiazolyl, benzophenothiazinyl, benzoxazolyl and benzophenoxazinyl, 1-30C alkyleneoxyalkyl, 1-30C alkyleneoxyaryl, 1-30C alkyleneoxyheteroaryl or 1-30C alkyleneoxyheterocyclyl, in which R1-R10 are not H simultaneously;    R3+R4=optionally substituted 3-30C cycloalkyl, 5-30C aryl, 1-30C alkylaryl, 1-30C alkylheteroaryl, 1-30C alkylheterocyclyl, 1-30C alkyleneoxyaryl, 1-30C alkyleneoxyheteroaryl or 1-30C alkyleneoxyheterocyclyl;and    R8+R9=optionally substituted 3-30C cycloalkyl, 5-30C aryl, 1-30C alkylaryl, 1-30C alkylheteroaryl, 1-30C alkylheterocyclyl, 1-30C alkyleneoxyaryl, 1-30C alkyleneoxyheteroaryl or 1-30C alkyleneoxyheterocyclyl.    An INDEPENDENT CLAIM is included for preparation of naphthacene tetracarboxylic acid diimide compound (I).