the organic compound consisting a luminescent layer in the electroluminescent device according to the present invention is a compound represented by the formula ( i ): ## str18 ## wherein b represents ## str19 ## ( in which x 1 is h , cl , ch 3 , och 3 , c 2 h 5 or cn , and l is 1 , 2 or 3 ) ## str20 ## ( in which x 2 is h or och 3 , and x 3 is h , ch 3 , ## str21 ## ( in which x 4 is h or ## str22 ## ( in which d is o , s , or n , x 5 is h or cooh , x 6 is h , ch 3 , c 2 h 5 or ## str23 ## and κ is 0 or 1 ) ## str24 ## ( in which x 7 is h or o ) ## str25 ## ( in which x 8 is o or c ( cn ) 2 ) ## str26 ## ( in which x 9 is h or ch 3 ) ## str27 ## ( in which x 10 is o or c ( cn ) 2 ) ## str28 ## ( in which d is o , s or n , i is 0 or 1 ) ## str29 ## ( in which e is o or s ) ## str30 ## ( in which e is o or s ) ## str31 ## ( in which g is s or nh ) ## str32 ## ( in which z represents : ( 1 ) substituted or unsubstituted ( c 4 - c 6 ) cycloalkenes containing at least one double bond in the ring , ( 2 ) ( c 4 - c 6 ) cycloalkenes having an aromatic ring and containing one double bond in the ring , ( 3 ) 5 - or 9 - membered heterocycles containing a double bond and at least one oxygen in the ring , ( 4 ) b 5 - membered heterocycles having an aromatic ring , and containing one oxygen and at least one double bond in the ring , ( 5 ) 6 - or 7 - membered heterocycles having c 4 or c 6 cycloalkene with at least one double , bond and containing two oxygen atoms in the ring , ( 6 ) c 5 , c 6 or c 11 heterocycles containing 1 or 2 sulfur atoms in the ring , ( 7 ) 5 - or 6 - membered heterocycles containing 2 to 4 nitrogen atoms and at least one double bond in the ring , ( 8 ) 5 -, 6 - or 8 - membered heterocycles having an aromatic ring , and containing at least one double bond and 1 or 2 nitrogen atoms in the ring , ( 9 ) 5 - or 6 - membered heterocycles containing 1 or 2 nitrogen atoms and , optionally , oxygen atom in the ring ; ar represents ## str33 ## m represents an integer of 1 to 6 ; and n represents an integer of 1 to 6 . as the specific compounds represented by the general formula ( i ), there can be exemplified compounds nos . 1 - 174 . the compound belonging to group 1 includes nos . 8 - 11 and 14 - 20 . the compound belonging to group 2 includes nos . 13 and 25 - 37 , the compound belonging to group 8 includes nos . 68 and 69 , the compound belonging to group 10 includes nos . 22 , 70 - 75 , 96 - 99 and 111 - 118 , the compound belonging to group 11 includes nos . 85 , 86 , 91 and 92 , the compound belonging to group 13 includes nos . 23 , 24 and 126 - 136 , the compound belonging to group 16 includes nos . 150 - 156 and 158 , the compound belonging to group 23 includes nos . 76 , 80 , 100 and 125 , the compound belonging to group 25 includes nos . 83 and 102 , the compound belonging to group 26 includes nos . 104 and 142 , the compound belonging to group 27 includes nos . 106 and 108 - 110 , in the substituent b of the formula ( i ), compounds belonging to groups 1 to 9 , 13 to 19 , 21 , 23 , 24 , 29 - 1 and 29 - 2 , more preferably groups 1 to 9 , 23 , 24 , 29 - 1 and 29 - 2 , most preferably groups 1 and 6 , are preferred . __________________________________________________________________________compound no . structural formula__________________________________________________________________________ ## str34 ## 2 ## str35 ## 3 ## str36 ## 4 ## str37 ## 5 ## str38 ## 6 ## str39 ## 7 ## str40 ## 8 ## str41 ## 9 ## str42 ## 10 ## str43 ## 11 ## str44 ## 12 ## str45 ## 13 ## str46 ## 14 ## str47 ## 15 ## str48 ## 16 ## str49 ## 17 ## str50 ## 18 ## str51 ## 19 ## str52 ## 20 ## str53 ## 21 ## str54 ## 22 ## str55 ## 23 ## str56 ## 24 ## str57 ## 25 ## str58 ## 26 ## str59 ## 27 ## str60 ## 28 ## str61 ## 29 ## str62 ## 30 ## str63 ## 31 ## str64 ## 32 ## str65 ## 33 ## str66 ## 34 ## str67 ## 35 ## str68 ## 36 ## str69 ## 37 ## str70 ## 38 ## str71 ## 39 ## str72 ## 40 ## str73 ## 41 ## str74 ## 42 ## str75 ## 43 ## str76 ## 44 ## str77 ## 45 ## str78 ## 46 ## str79 ## __________________________________________________________________________47 ## str80 ## 48 ## str81 ## 49 ## str82 ## 50 ## str83 ## 51 ## str84 ## 52 ## str85 ## 53 ## str86 ## 54 ## str87 ## 55 ## str88 ## 56 ## str89 ## 57 ## str90 ## 58 ## str91 ## 59 ## str92 ## 60 ## str93 ## 61 ## str94 ## 62 ## str95 ## 63 ## str96 ## 64 ## str97 ## 65 ## str98 ## 66 ## str99 ## 67 ## str100 ## 68 ## str101 ## 69 ## str102 ## 70 ## str103 ## 71 ## str104 ## 72 ## str105 ## 73 ## str106 ## 74 ## str107 ## 75 ## str108 ## 76 ## str109 ## 77 ## str110 ## 78 ## str111 ## 79 ## str112 ## 80 ## str113 ## 81 ## str114 ## 82 ## str115 ## 83 ## str116 ## 84 ## str117 ## 85 ## str118 ## 86 ## str119 ## 87 ## str120 ## 88 ## str121 ## 89 ## str122 ## 90 ## str123 ## 91 ## str124 ## 92 ## str125 ## 93 ## str126 ## 94 ## str127 ## 95 ## str128 ## 96 ## str129 ## 97 ## str130 ## 98 ## str131 ## 99 ## str132 ## 100 ## str133 ## 101 ## str134 ## 102 ## str135 ## 103 ## str136 ## 104 ## str137 ## 105 ## str138 ## 106 ## str139 ## 107 ## str140 ## 108 ## str141 ## 109 ## str142 ## 110 ## str143 ## __________________________________________________________________________111 ## str144 ## 112 ## str145 ## 113 ## str146 ## 114 ## str147 ## 115 ## str148 ## 116 ## str149 ## 117 ## str150 ## 118 ## str151 ## 119 ## str152 ## 120 ## str153 ## 121 ## str154 ## 122 ## str155 ## 123 ## str156 ## 124 ## str157 ## 125 ## str158 ## 126 ## str159 ## 127 ## str160 ## 128 ## str161 ## 129 ## str162 ## 130 ## str163 ## 131 ## str164 ## 132 ## str165 ## 133 ## str166 ## 134 ## str167 ## 135 ## str168 ## 136 ## str169 ## 137 ## str170 ## 138 ## str171 ## 139 ## str172 ## 140 ## str173 ## 141 ## str174 ## 142 ## str175 ## 143 ## str176 ## 144 ## str177 ## 145 ## str178 ## 146 ## str179 ## 147 ## str180 ## 148 ## str181 ## 149 ## str182 ## 150 ## str183 ## 151 ## str184 ## 152 ## str185 ## 153 ## str186 ## 154 ## str187 ## 155 ## str188 ## 156 ## str189 ## 157 ## str190 ## 158 ## str191 ## 159 ## str192 ## 160 ## str193 ## 161 ## str194 ## 162 ## str195 ## 163 ## str196 ## 164 ## str197 ## 165 ## str198 ## 166 ## str199 ## 167 ## str200 ## 168 ## str201 ## 169 ## str202 ## 170 ## str203 ## 171 ## str204 ## 172 ## str205 ## 173 ## str206 ## 174 ## str207 ## __________________________________________________________________________ the layer constituting the luminescence ( light emission ) of the electroluminescent device according to the present invention comprises at least one of the ingredients represented by the formula ( i ) and , if necessary , may also contain at least one known luminescent material for the stabilization of film crystallization . the layer constituting the luminescence of the electroluminescent device according to the present invention means a luminescent layer , or light - emitting electron transporting layer and hole transporting layer . the thickness of the layer constituting the luminescence of the present invention is not more than 2 μm , preferably , from 0 . 05 to 0 . 5 μm . for improving the charge injection efficiency from the electrode , a conventional charge injecting and transporting layer can be independently disposed between an anode and a cathode . as the charge injecting and transporting layer , there cen be exemplified a hole transporting layer for properly transporting holes to the cathode when the holes are injected and an electron transporting layer for properly transporting electrons to the anode . as the electroluminescent device according to the present invention , for example , the electroluminescent device having at least one conventional hole transporting layer , at least one conventional electron transporting layer , or at least one conventional hole transporting layer and at least one conventional electron transporting layer other than the luminescent layer of the present invention may be exemplified . as the electron transporting substance constituting the conventional electron transporting layer in the present invention , those compounds as disclosed in u . s . pat . nos . 4720432 and 4539507 can be used . as preferred conventional electron transporting substance , there can be mentioned aluminum trisoxine , perylene tetracarboxylic acid derivatives . the thickness of the electron transporting layer of the present invention is not more than 2000 å . as the hole transporting substance constituting the conventional hole transporting layer in the present invention , those compounds as disclosed in u . s . pat . nos . 4539507 and 4 , 720 , 432 can be used . as preferred conventional hole transporting compounds , there can be mentioned those having a hole mobility coefficient of at least 10 - 5 cm 2 / v - sec between electrodes applied with an electric field of 10 4 - 10 6 v / cm , for example , aromatic amine compound : n , n &# 39 ;- diphenyl - n , n &# 39 ;- bis ( 3 - methylphenyl )- 1 , 1 &# 39 ;- biphenyl 4 , 4 &# 39 ;- diamine . the thickness of the hole transporting layer in the present invention is not more than 2000 å . the anode , in the present invention comprises metal of great work function , alloys or compounds thereof , electroconductive polymers of great work function , etc . as specific examples , there can be mentioned nickel , gold , platinum and palladium and alloys thereof , tin oxide ( sno 2 ), indium - tin oxide ( ito ), copper iodide , poly ( 3 - methylthiophene ), polypyrrole , etc . the thickness of the anode of the present invention is from 100 to 5000 å , preferably , 200 to 2000 å . for the cathode in the present invention , metals of small work function may be used . for example , silver , tin , lead , magnesium , manganese and aluminum or alloys thereof may be used . the thickness of the cathode of the present invention is not less than 500 å . it is preferable that at least one of substances used for the anode and the cathode has a sufficient transparency in the region of a luminous wavelength ( light emitting wavelength ) of the device . specifically , it is preferable that the substance has a light transmittance of not lower than 80 %. the electroluminescent device according to the present invention is manufactured by successively laminating the respective layers described above on a transparent substrate such as glass in accordance with a customary method . for instance , the luminescent layer ( organic compound layer ) in the present invention is prepared by forming the foregoing compounds into thin films by means of vacuum vapor deposition , solution coating , etc . for the improvement of the stability , particularly , for the protection against moisture in air of the device , there may be mentioned a method of laminating a protecting layer , or a method of placing the entire device into a cell and sealing silicon oil , etc . therein . in a case where the compound used has hole transporting property , electron transporting property and luminescent property by itself , or compounds having respective property are used in admixture , a constitution as shown in fig1 ( 1 : luminescent layer , 2 : cathode , 3 : anode and 4 : substrate ) can be taken . fig2 ( 1 : luminescent layer , 2 : cathode , 3 : anode , 4 : substrate , 5 : electron transporting compound layer and 6 : hole transporting compound layer ) shows a constitution in which a luminescent layer 1 is formed by the combination of a hole transporting compound layer 6 and an electron transporting compound layer 5 . preferred properties of organic compounds are combined in this constitution , intended for the development of a device of excellent luminescence property in which holes or electrons can be transported smoothly from the electrode by the combination of layers of excellent hole transporting compound and / or electron transporting compound . either one of the compound layers emits light depending on the combination of the compound layers . fig3 ( 1 : luminescent layer , 1 &# 39 ;: luminescent compound layer , 2 : cathode , 3 : anode , 4 : substrate , 5 : electron transporting compound layer and 6 : hole transporting compound layer ) shows a structure in which a luminescent layer 1 is formed by the combination of a hole transporting compound layer 6 , a luminescent compound layer 1 &# 39 ; and an electron transporting compound layer 5 , which is based on an improvement for the concept of the function separation described above . by the function separation the selection for the compounds facilitates while taking notice of the hole transporting , electron transporting and luminescent properties , and as a result a wide range of compounds can be used and the versatility of the wavelength of luminescence is increased . any of the organic compounds according to the present invention is excellent in luminescent property and can be constituted , as occasion demand , as shown in fig1 and 3 . further , the compound represented by the formula ( i ) according to the present invention is excellent in the hole transporting property or the electron transporting property depending on b , ar in the formula ( i ). accordingly , two or more kinds of compounds according to the present invention may be used in the constitution as shown in fig2 and 3 . the electroluminescent device according to the present invention emits light under the application of an electric bias to the luminescent layer , but even slight pinholes , if any , will cause short circuit making the device to function no more . accordingly , it is desired to use a compound of excellent film - forming property for constituting the luminescent layer and , if necessary , the luminescent layer may be formed in combination with a compound of good film - forming property , for example , a polymer binder . as the polymer binder usable herein , there can be exemplified polystyrene , polyvinyl toluene , poly - n - vinyl carbazole , polymethyl methacrylate , polymethyl acrylate , polyester , polycarbonate and polyimide . in the electroluminescent device according to the present invention , since the compound represented by the formula ( i ) is used as the material for constituting the luminescent layer , light - emission at high luminance can be obtained for a long period even with a low driving voltage . the electroluminescent devices according to the present invention emits light of various tones by using the compounds according to the present invention . further , since in the present invention the devices can easily be prepared by means of vacuum vapor deposition , etc . there is provided a merit that inexpensive devices of large area can be produced efficiently . the present invention will be more precisely explained while referring to examples as follows . however , the present invention is not restricted to examples under mentioned . from the foregoing description , one skilled in the art can easily asserting the essential characteristics of the present invention , and without departing from the spirit and scope thereof , can make various changes and modifications of the invention to adapt it to various usages and conditions . a device was manufactured by forming an anode sized 3 mm × 3 mm , 500 å in thickness comprising indium tin oxide ( ito ) on a glass substrate , and forming , thereover , a hole transporting layer of 500 å in thickness comprising a benzidine derivative represented by the following formula ( a ), a luminescent layer of 1000 å in thickness comprising the compound no . 8 described above and an anode of 1500 å in thickness comprising silver - magnesium alloy ( silver : 7 . 7 atm %, and purity : 99 . 9 %) respectively by means of vacuum vapor deposition . the vacuum degree was about 1 × 10 - 6 torr and the substrate temperature was at a room temperature upon vapor deposition . a dc power source was connected by way of lead wires to the anode and the cathode of the thus manufactured device and , when 30 v of voltage was applied , a current density of 70 ma / cm 2 flowed to the device and clear blue luminescence was confirmed for a long period . ## str208 ## in this example , the compound ( no . 8 ) according to the present invention functioned as electron transporting and luminescent material . devices were manufactured in the same manner as in example 1 except for using the compounds shown below instead of the compound no . 8 used in example 1 . the results thereof are set forth below . ______________________________________example no . compound no . tone of emitted light______________________________________2 no . 162 blue3 no . 77 blue4 no . 63 yellow5 no . 62 yellow______________________________________ a device was manufactured in the same manner as in example 1 except for using the compound no . 9 as the ingredient for forming the luminescent layer and the perylene derivative represented by the following formula ( b ) as the ingredient for forming the electron transporting layer . the film thickness of the electron transporting layer was 500 å . when the device was driven in the same manner as in example 1 , a current of 30 ma / cm 2 flowed to the device under a voltage of 20 v , and clear blue luminescence was observed for long period . ## str209 ## in this example , the compound ( no . 9 ) according to the present invention functioned as hole transporting and luminescent material . devices were manufactured in the same manner as in example 6 except for using the compounds shown below instead of the compound no . 9 used in example 6 . the results thereof are set forth below . ______________________________________example no . compound no . tone of emitted light______________________________________7 no . 10 blue8 no . 11 blue9 no . 44 orange10 no . 65 blue______________________________________ using the substrate having an anode as in example 1 , a luminescent layer of 1000 å in thickness comprising the compound no . 9 and a silver - magnesium alloy layer of 1500 å in thickness as the cathode were respectively formed on the anode under the same conditions as described above by means of vacuum vapor deposition . when the device was driven in the same manner as in example 1 , a current of 20 ma / cm 2 flowed to the device at a voltage of 20 v , and clear blue luminescence was observed for long period . in this example , the compound ( no . 8 ) according to the present invention functioned as a luminescent layer . a device was manufactured in the same manner as in example 11 except for using the compound no . 119 instead of the compound no . 9 used in example 11 . the result thereof is set forth below . a device was manufactured by using the substrate having an anode as in example 1 and then vapor - depositing under vacuum , on the anode , a hole transporting layer of 600 å in thickness comprising a triphenylamine derivative represented by the following formula ( c ), a luminescent layer of 600 å in thickness comprising the compound no . 120 , an electron transporting layer of 600 å in thickness comprising perylene derivative represented by the formula ( b ) and a silver - magnesium alloy as the cathode were successively formed under the same conditions as those in example 1 . when the device was driven in the same manner as in example 1 , a current of 20 ma / cm 2 flowed to the device at a voltage of 30 v and blue luminescence was observed for a long period . ## str210 ## devices were manufactured in the same manner as in example 13 except for using the compounds shown below instead of the compound no . 120 used in example 13 . the results thereof are set forth below . ______________________________________example no . compound no . tone of emitted light______________________________________14 no . 159 blue15 no . 57 blue______________________________________