Organic light-emitting device

Abstract

An organic light-emitting device including a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer includes an emission layer, the emission layer includes a host and a fluorescent dopant, the organic light-emitting device satisfies Equation 1, the host includes a compound represented by Formulae 1, 2, or 3, and the fluorescent dopant satisfies Equation 2, wherein Formulae 1-3 and Equations 1-2 are the same as described in the specification.

What is claimed is: 
     
         1 . An organic light-emitting device comprising:
 a first electrode,   a second electrode facing the first electrode, and   an organic layer disposed between the first electrode and the second electrode, wherein   the organic layer comprises an emission layer,   the emission layer comprises a host and a fluorescent dopant,   the organic light-emitting device satisfies Equation 1,   the host comprises a compound represented by Formulae 1, 2, or 3, and   the fluorescent dopant satisfies Equation 2:
   0.2 electron Volts≤ E   T1 ( H )− E   T1 ( FD )≤0.5 electron Volts,   Equation 1
 
   0 electron Volts≤ E   S1 ( FD )− E   T1 ( FD )≤0.2 electron Volts,   Equation 2
 
   wherein in Equation 1 and 2,   E T1 (H) is a triplet energy level of the host expressed in electron Volts,   E T1 (FD) is a triplet energy level of the fluorescent dopant expressed in electron Volts,   E S1 (FD) is a singlet energy level of the fluorescent dopant expressed in electron Volts, and   E T1 (H), E T1 (FD), and E S1 (FD) are evaluated by using a Density Functional Theory method of Gaussian program that is structurally optimized at a level of B3LYP/6-31G(d,p):   
       
         
           
           
               
               
           
         
         wherein Z 1  to Z 8  and Z 11  to Z 18  in Formula 1 are each independently selected from hydrogen, deuterium, and a cyano group (CN), 
         Z 21  to Z 24  in Formula 1 are each independently selected from hydrogen, deuterium, a cyano group, a group represented by Formula 2A, and a group represented by Formula 2B, 
         Z 31  to Z 40  in Formula 2 and Z 41  to Z 48  in Formula 3 are each independently selected from hydrogen, deuterium, a cyano group, and a group represented by Formula 2C, wherein at least two selected from Z 31  to Z 40  in Formula 2 and at least two selected from Z 41  to Z 48  in Formula 3 are each independently selected from groups represented by Formula 2C, 
         Z 51  to R 55  in Formulae 2A to 2C are each independently hydrogen or deuterium, 
         a1 to a5 in Formulae 2A to 2C are each independently an integer selected from 0 to 4, 
         b1 in Formula 2A is an integer selected from 1 to 5, 
         b2 to b5 in Formulae 2B and 2C are each independently an integer selected from 0 to 4, provided that the sum of b2 and b3 is 1 or more, 
         * in Formulae 2A to 2C indicates a binding site to a neighboring atom, and 
         the compound represented by Formula 1, the compound represented by Formula 2, and the compound represented by Formula 3 each independently comprise at least one cyano group. 
       
     
     
         2 . The organic light-emitting device of  claim 1 , wherein
 at least one selected from Z 3 , Z 6 , Z 13 , and Z 16  in Formula 1 is a cyano group.   
     
     
         3 . The organic light-emitting device of  claim 1 , wherein
 Z 21  in Formula 1 is selected from groups represented by Formula 2A-1 to 2A-10, and 2B-1 to 2B-15:   
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein * in Formulae 2A-1 to 2A-10 and 2B-1 to 2B-15 indicates a binding site to a neighboring atom. 
       
     
     
         4 . The organic light-emitting device of  claim 1 , wherein
 in Formula 2, i) one selected from Z 34  and Z 35  and ii) one selected from Z 39  and Z 40  are each independently a group represented by Formula 2C.   
     
     
         5 . The organic light-emitting device of  claim 1 , wherein
 in Formula 3, i) one selected from Z 41  and Z 42  and ii) one selected from Z 47  and Z 48  are each independently a group represented by Formula 2C.   
     
     
         6 . The organic light-emitting device of  claim 1 , wherein
 Z 31  to Z 40  in Formula 2 and Z 41  to Z 48  in Formula 3 are each independently selected from hydrogen, deuterium, a cyano group, and a group represented by one formula selected from Formulae 2C-1 to 2C-3, and at least two selected from Z 31  to Z 40  in Formula 2 and at least two selected from Z 41  to Z 48  in Formula 3 are each independently selected from groups represented by Formulae 2C-1 to 2C-3:   
       
         
           
           
               
               
           
         
         wherein * in Formulae 2C-1 to 2C-3 indicates a binding site to a neighboring atom. 
       
     
     
         7 . The organic light-emitting device of  claim 1 , wherein
 the host comprises a compound represented by Formula 1-1, 2-1, or 3-1:   
       
         
           
           
               
               
           
         
         wherein 
         Z 3 , Z 6 , Z 13 , and Z 16  in Formula 1-1 are each independently be hydrogen, deuterium, or a cyano group, 
         Z 21  in Formula 1-1 is selected from hydrogen, deuterium, a cyano group, and a group represented by one formula selected from Formulae 2A-1 to 2A-10, and 2B-1 to 2B-15, 
         Z 31  to Z 33 , Z 35  to Z 40 , and Z 61  to Z 64  in Formula 2-1 are each independently hydrogen, deuterium, or a cyano group, and 
         Z 41 , Z 43  to Z 46 , Z 48 , and Z 61  to Z 64  in Formula 3-1 are each independently hydrogen, deuterium, or a cyano group: 
       
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein * in Formulae 2A-1 to 2A-10 and 2B-1 to 2B-15 indicates a binding site to a neighboring atom. 
       
     
     
         8 . The organic light-emitting device of  claim 7 , wherein
 at least one selected from Z 3 , Z 6 , Z 13 , and Z 16  in Formula 1-1 is a cyano group;   Z 21  in Formula 1-1 is selected from groups represented by Formulae 2A-1 to 2A-10 and 2B-1 to 2B-15; or   at least one selected from Z 61  to Z 64  in Formulae 2-1 and 3-1 is a cyano group.   
     
     
         9 . The organic light-emitting device of  claim 1 , wherein
 the host is a compound selected from Compounds H1 to H14:   
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         10 . The organic light-emitting device of  claim 1 , wherein
 a highest occupied molecular orbital (HOMO) energy level of the host is in a range of −5.90 electron Volts to −5.50 electron Volts,   a lowest unoccupied molecular orbital (LUMO) energy level of the host is in a range of −2.30 electron Volts to −1.50 electron Volts,   a triplet energy level of the host is in a range of 2.90 electron Volts to 3.15 electron Volts, and   the HOMO energy level, LUMO energy level, and triplet energy level of the host are evaluated by using a Density Functional Theory method of Gaussian program that is structurally optimized at a level of B3LYP/6-31G(d,p).   
     
     
         11 . The organic light-emitting device of  claim 1 , wherein
 the fluorescent dopant is a compound represented by Formula 11:   
       
         
           
           
               
               
           
         
         wherein 
         ring A 1  in Formula 11 is a group represented by Formula 12A, 
         ring A2 in Formula 11 is a group represented by Formula 12B, 
         X 1  in Formula 12B is N-[(L 2 ) c2 -Ar 2 ], O, or S, 
         L 1  and L2 are each independently selected from a substituted or unsubstituted C 3 -C 10  cycloalkylene group, a substituted or unsubstituted C 1 -C 10  heterocycloalkylene group, a substituted or unsubstituted C 3 -C 10  cycloalkenylene group, a substituted or unsubstituted C 1 -C 10  heterocycloalkenylene group, a substituted or unsubstituted C 6 -C 60  arylene group, a substituted or unsubstituted C 1 -C 60  heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group, 
         c1 and c2 are each independently an integer selected from 0 to 4, 
         Ar 1  and Ar 2  are each independently selected from a substituted or unsubstituted C 3 -C 10  cycloalkyl group, a substituted or unsubstituted C 1 -C 10  heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10  cycloalkenyl group, a substituted or unsubstituted C 1 -C 10  heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60  aryl group, a substituted or unsubstituted C 1 -C 60  heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, 
         R 1  to R 10  are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C 1 -C 60  alkyl group, a substituted or unsubstituted C 2 -C 60  alkenyl group, a substituted or unsubstituted C 2 -C 60  alkynyl group, a substituted or unsubstituted C 1 -C 60  alkoxy group, a substituted or unsubstituted C 3 -C 10  cycloalkyl group, a substituted or unsubstituted C 1 -C 10  heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10  cycloalkenyl group, a substituted or unsubstituted C 1 -C 10  heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60  aryl group, a substituted or unsubstituted C 6 -C 60  aryloxy group, a substituted or unsubstituted C 6 -C 60  arylthio group, a substituted or unsubstituted C 1 -C 60  heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 1 )(Q 2 )(Q 3 ), —N(Q 4 )(Q 5 ), and —B(Q 6 )(Q 7 ), and at least one substituent selected from the substituted C 3 -C 10  cycloalkylene group, substituted C 1 -C 10  heterocycloalkylene group, substituted C 3 -C 10  cycloalkenylene group, substituted C 1 -C 10  heterocycloalkenylene group, substituted C 6 -C 60  arylene group, substituted C 1 -C 60  heteroarylene group, a substituted divalent non-aromatic condensed polycyclic group, a substituted divalent non-aromatic condensed heteropolycyclic group, substituted C 1 -C 60  alkyl group, substituted C 2 -C 60  alkenyl group, substituted C 2 -C 60  alkynyl group, substituted C 1 -C 60  alkoxy group, substituted C 3 -C 10  cycloalkyl group, substituted C 1 -C 10  heterocycloalkyl group, substituted C 3 -C 10  cycloalkenyl group, substituted C 1 -C 10  heterocycloalkenyl group, substituted C 6 -C 60  aryl group, substituted C 6 -C 60  aryloxy group, substituted C 6 -C 60  arylthio group, substituted C 1 -C 60  heteroaryl group, a substituted monovalent non-aromatic condensed polycyclic group and a substituted monovalent non-aromatic condensed heteropolycyclic group is selected from 
         deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60  alkyl group, a C 2 -C 60  alkenyl group, a C 2 -C 60  alkynyl group, and a C 1 -C 60  alkoxy group; 
         a C 1 -C 60  alkyl group, a C 2 -C 60  alkenyl group, a C 2 -C 60  alkynyl group, and a C 1 -C 60  alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 3 -C 10  cycloalkyl group, a C 1 -C 10  heterocycloalkyl group, a C 3 -C 10  cycloalkenyl group, a C 1 -C 10  heterocycloalkenyl group, a C 6 -C 60  aryl group, a C 6 -C 60  aryloxy group, a C 6 -C 60  arylthio group, a C 1 -C 60  heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 11 )(Q 12 )(Q 13 ), —N(Q 14 )(Q 15 ), and —B(Q 16 )(Q 17 ); 
         a C 3 -C 10  cycloalkyl group, a C 1 -C 10  heterocycloalkyl group, a C 3 -C 10  cycloalkenyl group, a C 1 -C 10  heterocycloalkenyl group, a C 6 -C 60  aryl group, a C 6 -C 60  aryloxy group, a C 6 -C 60  arylthio group, a C 1 -C 60  heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group; 
         a C 3 -C 10  cycloalkyl group, a C 1 -C 10  heterocycloalkyl group, a C 3 -C 10  cycloalkenyl group, a C 1 -C 10  heterocycloalkenyl group, a C 6 -C 60  aryl group, a C 6 -C 60  aryloxy group, a C 6 -C 60  arylthio group, a C 1 -C 60  heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C 1 -C 60  alkyl group, a C 2 -C 60  alkenyl group, a C 2 -C 60  alkynyl group, a C 1 -C 60  alkoxy group, a C 3 -C 10  cycloalkyl group, a C 1 -C 10  heterocycloalkyl group, a C 3 -C 10  cycloalkenyl group, a C 1 -C 10  heterocycloalkenyl group, a C 6 -C 60  aryl group, a C 6 -C 60  aryloxy group, a C 6 -C 60  arylthio group, a C 1 -C 60  heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —Si(Q 21 )(Q 22 )(Q 23 ), —N(Q 24 )(Q 25 ), and —B(Q 26 )(Q 27 ); and 
         —Si(Q 31 )(Q 32 )(Q 33 ), —N(Q 34 )(Q 35 ), and —B(Q 36 )(Q 37 ), 
         wherein Q 1  to Q 7 , Q 11  to Q 17 , Q 21  to Q 27 , and Q 31  to Q 37  are each independently selected from hydrogen, a substituted or unsubstituted C 1 -C 60  alkyl group, a substituted or unsubstituted C 2 -C 60  alkenyl group, a substituted or unsubstituted C 2 -C 60  alkynyl group, a substituted or unsubstituted C 1 -C 60  alkoxy group, a substituted or unsubstituted C 3 -C 10  cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10  cycloalkenyl group, a substituted or unsubstituted heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60  aryl group, a substituted or unsubstituted C 6 -C 60  aryloxy group, a substituted or unsubstituted C 6 -C 60  arylthio group, a substituted or unsubstituted C 1 -C 60  heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group. 
       
     
     
         12 . The organic light-emitting device of  claim 11 , wherein
 the fluorescent dopant is represented by one formula of Formulae 11-1 to 11-6:   
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein X 1 , L 1 , L 2 , c1, c2, Ar 1 , Ar 2 , and R 1  to R 10  in Formulae 11-1 to 11-6 are the same as in  claim 11 . 
       
     
     
         13 . The organic light-emitting device of  claim 11 , wherein
 L 1  and L 2  are each independently selected from   a phenylene group, a naphthylene group, a fluorenylene group, a pyridinylene group, a pyrimidinylene group, a pyrazinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a carbazolylene group, a dibenzofuranylene group, a dibenzothiophenylene group, and an indolocarbazolylene group;   a phenylene group, a naphthylene group, a fluorenylene group, a pyridinylene group, a pyrimidinylene group, a pyrazinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a carbazolylene group, a dibenzofuranylene group, a dibenzothiophenylene group, and an indolocarbazolylene group, each substituted with at least one selected from deuterium, a C 1 -C 10  alkyl group, a alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, an indolocarbazolyl group, —Si(Q 31 )(Q 32 )(Q 33 ), and —N(Q 34 )(Q 35 ),   wherein Q 31  to Q 35  are each independently selected from a C 1 -C 10  alkyl group, a alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group, and   c1 and c2 are each independently an integer selected from 0, 1, or 2.   
     
     
         14 . The organic light-emitting device of  claim 11 , wherein
 Ar 1  and Ar 2  are each independently selected from   a group represented by Formula 13;   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and an indolocarbazolyl group; and   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and an indolocarbazolyl group, each substituted with at least one selected from deuterium, a C 1 -C 10  alkyl group, a C 1 -C 10  alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, an indolocarbazolyl group, —Si(Q 31 )(Q 32 )(Q 33 ), and —N(Q 34 )(Q 35 ),   wherein Q 31  to Q 35  are each independently selected from a C 1 -C 10  alkyl group, a C 1 -C 10  alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group:   
       
         
           
           
               
               
           
         
         wherein in Formula 13, 
         X 11  is N or C-[(L 11 ) c11 -Ar 11 ], 
         X 12  is N or C-[(L 12 ) c12 -Ar 12 ], 
         X 13  is N or C-[(L 13 ) c13 -Ar 13 ], 
         X 14  is N or C-[(L 14 ) c14 -Ar 14 ], 
         X 15  is N or C-[(L 15 ) c15 -Ar 15 ], 
         provided that at least one selected from X 11  to X 15  is N, 
         L 11  to L 15  are each independently selected from 
         a phenylene group, a naphthylene group, a fluorenylene group, a pyridinylene group, a pyrimidinylene group, a pyrazinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a carbazolylene group, a dibenzofuranylene group, a dibenzothiophenylene group, and an indolocarbazolylene group; and 
         a phenylene group, a naphthylene group, a fluorenylene group, a pyridinylene group, a pyrimidinylene group, a pyrazinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a carbazolylene group, a dibenzofuranylene group, a dibenzothiophenylene group, and an indolocarbazolylene group, each substituted with at least one selected from deuterium, a C 1 -C 10  alkyl group, a alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and an indolocarbazolyl group; 
         c11 to c15 are each independently 0 or 1, 
         Ar 11  to Ar 15  are each independently selected from 
         a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and an indolocarbazolyl group; and 
         a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, an indolocarbazolyl group, each substituted with at least one selected from deuterium, a C 1 -C 10  alkyl group, a C 1 -C 10  alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, and an indolocarbazolyl group, and 
         * indicates a binding site to a neighboring atom. 
       
     
     
         15 . The organic light-emitting device of  claim 13 , wherein
 at least one selected from Ar 1  and Ar 2  is a group represented by Formula 13.   
     
     
         16 . The organic light-emitting device of  claim 11 , wherein
 R 1  to R 10  are each independently selected from hydrogen, deuterium, a C 1 -C 10  alkyl group, a C 1 -C 10  alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, an indolocarbazolyl group, —Si(Q 1 )(Q 2 )(Q 3 ), and —N(Q 4 )(Q 5 ),   wherein Q 1  to Q 5  are each independently selected from a C 1 -C 10  alkyl group, a C 1 -C 10  alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group.   
     
     
         17 . The organic light-emitting device of  claim 1 , wherein
 the fluorescent dopant is a compound represented by Formula 14A:   
       
         
           
           
               
               
           
         
         wherein R 21  to R 25  in Formula 14A are each independently selected from hydrogen, deuterium, a cyano group, a C 1 -C 10  alkyl group, a phenyl group, a biphenyl group, or a terphenyl group. 
       
     
     
         18 . The organic light-emitting device of  claim 11 , wherein
 the fluorescent dopant is selected from Compounds 1 to 81 and 201 to 203:   
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         19 . The organic light-emitting device of  claim 1 , wherein
 the fluorescent dopant is a thermally activated delayed fluorescence (TADF) dopant that emits blue light.   
     
     
         20 . The organic light-emitting device of  claim 1 , wherein
 an amount of the fluorescent dopant is in a range of 0.01 to 30 parts by weight of 100 parts by weight of the host.