the diaminonaphthalene derivatives of the present invention glow blue they provide organic el devices emitting light of different colors by incorporation of another luminescent material such as a blue green or red luminescent material in general a compound used in an organic layer that constitutes an organic el device preferably forms no excited complex with a compound used in another layer the diaminonaphthalene derivatives according to the present invention have an advantage that they do not easily form an excited complex with another compound this is considered to be due to introduction of a phenylnaphthylene group the organic el devices of the present invention are endowed not only with high luminous efficacy but also with excellent durability during storage and in use this is because the diaminonaphthalene derivatives used in the present invention have a high tg point the diaminonaphthalene derivatives of formula 1 function as both a hole transportation material and a hole injection material the organic el device of the present invention may be realized in a variety of modes basically the device has a structure wherein an organic layer containing the above described diaminonaphthalene derivative is sandwiched by a pair of electrodes anode and cathode and optionally a hole injection material a hole transportation material a luminescent material an electron injection material or an electron transportation material may be incorporated into the above described diaminonaphthalene derivative layer when the diaminonaphthalene derivative layer serves as a luminescence layer another luminescent material may be incorporated thereto to thereby emit light having a.