WO2013181897A1 - 有机电致发光器件及其制备方法以及显示装置 - Google Patents
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- WO2013181897A1 WO2013181897A1 PCT/CN2012/083893 CN2012083893W WO2013181897A1 WO 2013181897 A1 WO2013181897 A1 WO 2013181897A1 CN 2012083893 W CN2012083893 W CN 2012083893W WO 2013181897 A1 WO2013181897 A1 WO 2013181897A1
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 529
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 239000002346 layers by function Substances 0.000 claims abstract description 32
- 239000011159 matrix material Substances 0.000 claims description 140
- 239000000463 material Substances 0.000 claims description 80
- 230000005525 hole transport Effects 0.000 claims description 64
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 15
- -1 amine compound Chemical class 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 claims description 7
- 238000005401 electroluminescence Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 claims description 5
- NSMJMUQZRGZMQC-UHFFFAOYSA-N 2-naphthalen-1-yl-1H-imidazo[4,5-f][1,10]phenanthroline Chemical compound C12=CC=CN=C2C2=NC=CC=C2C2=C1NC(C=1C3=CC=CC=C3C=CC=1)=N2 NSMJMUQZRGZMQC-UHFFFAOYSA-N 0.000 claims description 4
- 239000007983 Tris buffer Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 150000002429 hydrazines Chemical class 0.000 claims description 4
- 150000002460 imidazoles Chemical class 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 125000005259 triarylamine group Chemical group 0.000 claims description 4
- 150000001716 carbazoles Chemical class 0.000 claims description 3
- 150000004696 coordination complex Chemical class 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
- AWXGSYPUMWKTBR-UHFFFAOYSA-N 4-carbazol-9-yl-n,n-bis(4-carbazol-9-ylphenyl)aniline Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(N(C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=C1 AWXGSYPUMWKTBR-UHFFFAOYSA-N 0.000 claims description 2
- LZDHIQDKAYUDND-UHFFFAOYSA-N biphenylene-1,2-diamine Chemical class C1=CC=C2C3=C(N)C(N)=CC=C3C2=C1 LZDHIQDKAYUDND-UHFFFAOYSA-N 0.000 claims description 2
- SKEDXQSRJSUMRP-UHFFFAOYSA-N lithium;quinolin-8-ol Chemical compound [Li].C1=CN=C2C(O)=CC=CC2=C1 SKEDXQSRJSUMRP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004770 highest occupied molecular orbital Methods 0.000 claims 6
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims 2
- 101000837344 Homo sapiens T-cell leukemia translocation-altered gene protein Proteins 0.000 claims 1
- 102100028692 T-cell leukemia translocation-altered gene protein Human genes 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 description 23
- 239000000969 carrier Substances 0.000 description 17
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 13
- 238000001704 evaporation Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 10
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- 108091006149 Electron carriers Proteins 0.000 description 7
- 239000002019 doping agent Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000007738 vacuum evaporation Methods 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UDQLIWBWHVOIIF-UHFFFAOYSA-N 3-phenylbenzene-1,2-diamine Chemical class NC1=CC=CC(C=2C=CC=CC=2)=C1N UDQLIWBWHVOIIF-UHFFFAOYSA-N 0.000 description 2
- VIZUPBYFLORCRA-UHFFFAOYSA-N 9,10-dinaphthalen-2-ylanthracene Chemical compound C12=CC=CC=C2C(C2=CC3=CC=CC=C3C=C2)=C(C=CC=C2)C2=C1C1=CC=C(C=CC=C2)C2=C1 VIZUPBYFLORCRA-UHFFFAOYSA-N 0.000 description 2
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 229920000144 PEDOT:PSS Polymers 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- COLNWNFTWHPORY-UHFFFAOYSA-M lithium;8-hydroxyquinoline-2-carboxylate Chemical compound [Li+].C1=C(C([O-])=O)N=C2C(O)=CC=CC2=C1 COLNWNFTWHPORY-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 2
- IWZZBBJTIUYDPZ-DVACKJPTSA-N (z)-4-hydroxypent-3-en-2-one;iridium;2-phenylpyridine Chemical compound [Ir].C\C(O)=C\C(C)=O.[C-]1=CC=CC=C1C1=CC=CC=N1.[C-]1=CC=CC=C1C1=CC=CC=N1 IWZZBBJTIUYDPZ-DVACKJPTSA-N 0.000 description 1
- IXHWGNYCZPISET-UHFFFAOYSA-N 2-[4-(dicyanomethylidene)-2,3,5,6-tetrafluorocyclohexa-2,5-dien-1-ylidene]propanedinitrile Chemical compound FC1=C(F)C(=C(C#N)C#N)C(F)=C(F)C1=C(C#N)C#N IXHWGNYCZPISET-UHFFFAOYSA-N 0.000 description 1
- RKVIAZWOECXCCM-UHFFFAOYSA-N 2-carbazol-9-yl-n,n-diphenylaniline Chemical compound C1=CC=CC=C1N(C=1C(=CC=CC=1)N1C2=CC=CC=C2C2=CC=CC=C21)C1=CC=CC=C1 RKVIAZWOECXCCM-UHFFFAOYSA-N 0.000 description 1
- 125000001622 2-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C(*)C([H])=C([H])C2=C1[H] 0.000 description 1
- 239000005725 8-Hydroxyquinoline Substances 0.000 description 1
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 150000007978 oxazole derivatives Chemical class 0.000 description 1
- 229960003540 oxyquinoline Drugs 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 150000007979 thiazole derivatives Chemical class 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/30—Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/90—Multiple hosts in the emissive layer
Definitions
- the present invention relates to an organic electroluminescent device, a method of fabricating the same, and a display device. Background technique
- OLED Organic Light-Emitting Device
- OLED Organic Electroluminescent Device: Organic Light-Emitting Device
- the structure of the existing OLED generally includes a substrate 1, an anode layer 2, a cathode layer 10, and an organic functional layer disposed between the anode layer 2 and the cathode layer 10.
- the organic functional layer includes an empty layer in sequence.
- the hole injection layer 3 is adjacent to the anode layer 2, and the electron injection layer 9 is adjacent to the cathode layer 10.
- the luminescence mechanism of the OLED is: when a voltage is applied between the anode layer 2 and the cathode layer 10, the holes injected from the anode layer 2 are driven to enter the luminescence through the hole injection layer 3 and the hole transport layer 4 under the driving of the external voltage.
- electrons injected from the cathode layer 10 enter the light-emitting layer 6 through the electron injecting layer 9 and the electron transporting layer 8, and holes and electrons entering the light-emitting layer 6 are combined to form excitons in the composite region, and exciton radiation transition Illumination produces a luminescence phenomenon, that is, electroluminescence is formed.
- the composite region is generally located in the vicinity of the interface with the electron transport layer in the light-emitting layer. After the excitons are formed, they diffuse to both sides of the interface, and a part of the excitons diffuse into the undoped luminescent material region, and then attenuate, so that no radiation transition occurs.
- An aspect of the invention provides an organic electroluminescent device comprising a substrate, an anode layer, a cathode layer, and an organic functional layer disposed between the anode layer and the cathode layer, the organic functional layer comprising a light-emitting layer, wherein
- the light-emitting layer includes three sequentially adjacent sub-light-emitting layers, that is, a first sub-light-emitting layer close to the anode layer, a second sub-light-emitting layer, and a third sub-light-emitting layer near the cathode layer.
- the three sub-emissive layers are made of a host material doped luminescent material; wherein the matrix material of the second sub-emissive layer is mixed with a matrix material, the mixed matrix material is composed of a matrix material having a hole transporting ability and a matrix material having electron transporting ability, wherein the matrix material in the first sub-light emitting layer is a matrix material having a hole transporting ability, and the third sub-light emitting layer is The matrix material is a matrix material having electron transporting ability.
- the position of the HOMO of the matrix material of the first sub-light-emitting layer is 0.2 ev or more higher than the position of the HOMO of the matrix material of the third sub-light-emitting layer
- the first sub- The position of the LUMO of the host material of the light-emitting layer is 0.2 ev or more higher than the position of the LUMO of the matrix material of the third sub-light-emitting layer.
- the matrix material having the hole transporting ability is the same as the matrix material in the first sub-luminescent layer
- the matrix material having electron transporting ability is the same as the matrix material in the third sub-light emitting layer.
- the mixing ratio of the matrix material having hole transporting ability to the matrix material having electron transporting ability is in the range of 1:9-9: 1.
- the host material in the first sub-light emitting layer and the matrix material having hole transporting ability in the second sub-light emitting layer an aromatic diamine compound, a triphenylamine compound An aromatic triamine compound, a biphenyldiamine derivative or a triarylamine polymer; a matrix material in the third sub-light emitting layer; and a matrix material having a electron transporting ability in the second sub-light emitting layer a complex, a carbazole derivative, an imidazole derivative, a phenanthroline derivative or a hydrazine derivative; the first sub luminescent layer, the second sub luminescent layer, and the third sub luminescent layer
- the luminescent material is made of a phosphorescent material based on Ir, Pt, Ru, Cu.
- the host material in the first sub-luminescent layer and The matrix material having hole transporting ability in the second sub-light emitting layer is: 9, 10-di-(2-naphthyl) anthracene (ADN), TAZ, CBP, MCP, 4, 4', 4"- Tris(carbazol-9-yl)triphenylamine (TCTA) or ruthenium, ⁇ '-diphenyl-fluorene, ⁇ '-bis(1-naphthyl)-1 ( ⁇ ); in the third sub-luminescent layer a matrix material and a matrix material having electron transporting ability in the second sub-light emitting layer: 8-hydroxyquinoline aluminum (Alq3), 8-hydroxyquinoline lithium (Liq), 1, 3, 5-three ( N-phenyl-2-benzimidazole-2)benzene (TPBI), BCP or Bphen.
- ADN 9, 10-di-(2-naphthyl) anthracene
- TAZ Tris(carbazol
- the thickness of the luminescent layer ranges from 3 to 300 nm
- the thickness of the first sub luminescent layer, the second sub luminescent layer, and the third sub luminescent layer ranges from 1 -100 ⁇ .
- the organic functional layer further includes a hole transport layer and an electron transport layer, the hole transport layer being located adjacent to the first sub-light-emitting layer and close to the anode a side, the electron transport layer is located on a side adjacent to the third sub-emissive layer and adjacent to the cathode, wherein an energy level of the hole transport layer matches an energy level of a matrix material of the first sub-emissive layer a hole is introduced into the first sub-light emitting layer; an energy level of the electron transport layer is matched with an energy level of a matrix material of the third sub-light emitting layer, so that electrons enter the third sub-light emitting layer .
- the position of the HOMO of the hole transporting layer differs from the position of the HOMO of the matrix material of the first sub-luminescent layer by no more than 0.5 ev
- the position of the LUMO of the electron transporting layer The position of the LUMO of the matrix material of the third luminescent layer differs by no more than 0.5 ev.
- the hole transport layer includes two or more sub-hole transport layers, and the sub-hole transport layer includes at least a first hole transport layer and a second hole a transport layer, the second hole transport layer is adjacent to the first sub-emissive layer, and a position of a HOMO of the second hole transport layer is different from a position of a HOMO of the matrix material of the first sub-emissive layer Not more than 0.2 ev; the position of the LUMO of the electron transport layer differs from the position of the LUMO of the matrix material of the third sub-light-emitting layer by no more than 0.2 ev.
- Another aspect of the present invention provides a display device comprising the above electroluminescent device. Still another aspect of the present invention provides a method of fabricating an organic electroluminescent device, comprising the steps of: forming a light-emitting layer, wherein the step of fabricating the light-emitting layer comprises:
- first sub-emissive layer made of a matrix material doped luminescent material having a hole transporting ability
- second sub-emissive layer on the first sub-emissive layer, the second sub-emissive layer being made of a matrix material having a hole transporting ability and a matrix material having electron transporting ability and doped with a luminescent material;
- FIG. 1 is a schematic structural view of an organic electroluminescent device in the prior art
- FIG. 2 is a schematic structural view of an organic electroluminescent device according to Embodiment 1 of the present invention.
- FIG. 3 is a schematic structural view of an organic electroluminescent device according to Embodiments 2 and 3 of the present invention
- FIG. 4 is a current density-current efficiency curve of the organic electroluminescent device according to Embodiment 2 of the present invention
- Fig. 5 is a graph showing the luminance-current efficiency of the organic electroluminescent device of Example 3 of the present invention.
- 6 is a schematic diagram showing the energy level structure of Embodiment 2;
- Embodiment 7 is a schematic diagram showing the energy level structure of Embodiment 3.
- Figure 8 is a flow chart showing a method of preparing an organic electroluminescent device of the present invention.
- the vacuum or infinity is defined as the energy zero, and all the carriers are in a negative energy level.
- the energy level value refers to the value after taking the absolute value thereof, that is, the value of the energy level is described by the magnitude of the absolute value, for example, the energy level value at the vacuum or infinity is 0, and the low work function.
- the energy level of the value refers to the energy level with the absolute value (level value) of the energy level.
- the energy level of the high power function value refers to the energy level with the absolute value of the energy level (energy level value);
- the level of the energy level is compared, for example: the position of the energy level of the low work function value is higher than the position of the energy level of the high work function value, or the position of the energy level of the 5 ev level value. It is lower than the energy level of the 3ev energy level.
- the organic electroluminescent device comprises a substrate 1, an anode layer 2, a cathode layer 10, and an organic functional layer disposed between the anode layer 2 and the cathode layer 10.
- the organic functional layer includes a hole injection layer 3, a hole transport layer 4, an electron blocking layer 5, a light emitting layer 6, a hole and exciton blocking layer 7, an electron transport layer 8, and an electron injecting layer 9.
- An external power source 11 is connected between the anode layer 2 and the cathode layer 10, and the organic electroluminescent device emits light under the driving of the external power source 11.
- the organic electroluminescent device of the present embodiment includes a substrate 1, an anode layer 2, a cathode layer 10, and an organic functional layer disposed between the anode layer 2 and the cathode layer 10, the organic functional layer Only the hole transport layer 4, the light-emitting layer 6, and the electron transport layer 8 may be included.
- the organic electroluminescent device of the present embodiment includes a substrate 1, an anode layer 2, a cathode layer 10, and an organic functional layer disposed between the anode layer 2 and the cathode layer 10, the organic functional layer Can also only A light emitting layer 6 is included.
- the light-emitting layer 6 includes three adjacent light-emitting layers, that is, a first sub-light-emitting layer 61 close to the anode layer 2, a third sub-light-emitting layer 63 near the cathode layer 10, and A second sub-emissive layer 62 between the sub-emissive layer 61 and the third sub-emissive layer 63.
- the three sub-emissive layers are each made of a matrix material doped luminescent material, wherein the matrix material of the second sub-emissive layer 62 is mixed with a matrix material composed of a matrix material having hole transporting ability and having electrons
- the matrix material of the transport capability is mixed
- the matrix material in the first sub-light-emitting layer 61 is a single-substrate material having a hole transporting ability
- the matrix material in the third sub-light-emitting layer 63 is a single substrate having electron transporting ability. material.
- the matrix material having a hole transporting ability means a matrix material having a hole transporting ability stronger than the electron transporting ability
- the matrix material having electron transporting ability means a matrix material having an electron transporting ability stronger than a hole transporting ability.
- having a hole transporting ability can be defined as a charge transporting ability when a mobility of holes is larger than a mobility of electrons, and can be measured by a conventional method such as a time-of-flight method; a matrix material having electron transporting ability or having a hole Transmission capacity can be similarly pushed.
- HOMO Highest Occupied Molecular
- the position of the Orbital, the highest occupied orbital is 0.2 ev or more higher than the position of the HOMO of the matrix material of the third sub-light-emitting layer 63, and the LUMO of the matrix material of the first sub-light-emitting layer 61 ( Lowest Unoccupied Molecular Orbital)
- the position of the substrate is 0.2 ev or more higher than the position of the LUMO of the matrix material of the third sub-light-emitting layer 63.
- the matrix material in the first sub-light-emitting layer 61 may be an aromatic diamine compound, a triphenylamine compound, an aromatic triamine compound, a biphenylenediamine derivative or a triarylamine polymer.
- the matrix material in the first sub-light-emitting layer 61 is: 9, 10-di-(2-naphthyl) anthracene (ADN), TAZ, CBP, MCP, 4, 4', 4"-three (carbazol-9-yl)triphenylamine (TCTA) or hydrazine, ⁇ '-diphenyl-hydrazine, ⁇ '-bis(1-naphthyl)-1 ( ⁇ ).
- the matrix material in the third sub-light-emitting layer 63 may be a metal complex, a carbazole derivative, an imidazole derivative, a phenanthroline derivative or a derivative of hydrazine.
- the matrix material in the third sub-light-emitting layer 63 is: 8-hydroxyquinoline aluminum (Alq3), 8-hydroxyquinolate lithium (Liq), 1, 3, 5-tris(N-phenyl -2- benzoamidazole-2) benzene (TPBI), BCP or Bphen.
- the matrix material having the hole transporting ability in the mixed matrix material of the second sub-light-emitting layer 62, is the same as the matrix material in the first sub-light-emitting layer 61, and has an electron.
- the substrate material for the transfer ability is the same as the matrix material of the third sub-light-emitting layer 63.
- the mixing ratio of the matrix material having a hole transporting ability to the matrix material having electron transporting ability may range from 1:9 to 9:1, and in the present embodiment, the ratio is 1:1.
- the luminescent material in the first sub luminescent layer 61, the second sub luminescent layer 62, and the third sub luminescent layer 63 may be a phosphorescent material based on Ir, Pt, Ru, or Cu.
- the phosphorescent material can be used with FIrpic, Fir6, Fir, FIrtaz, Ir(ppy) 3 , IrPi, Ir(ppy) 2 (acac), PtOEP, (btp) 2 Iracac, Ir(piq) 2 ( Acac), (MDQ) 2 Iracac et al.
- the thickness of the luminescent layer may range from 3 to 300 nm, and the thickness of the first sub luminescent layer 61, the second sub luminescent layer 62, and the third sub luminescent layer 63 may range from 1 to 100 nm. In this embodiment, the thicknesses of the first sub-light emitting layer 61, the second sub-light emitting layer 62, and the third sub-light emitting layer 63 may each be 10 nm.
- the energy level of the hole transport layer 4 matches the energy level of the matrix material of the first sub-light emitting layer 61, that is, the position of the HOMO of the hole transport layer 4 and the position of the HOMO of the matrix material of the first sub-light emitting layer 61.
- the position of the HOMO of the hole transport layer 4 is 0.5 ev or less higher than the position of the HOMO of the matrix material of the first sub-light-emitting layer 61, so that holes can smoothly enter the first sub-light-emitting layer 61;
- the energy level of the layer 8 is matched with the energy level of the matrix material of the third sub-light-emitting layer 63, that is, the position of the LUMO of the electron transport layer 8 is close to the position of the LUMO of the matrix material of the third sub-light-emitting layer 63, and the electron transport layer
- the position of LUMO of 8 is lower than the position of LUMO of the matrix material of the third sub-light-emitting layer 63 by 0.5 ev or less, so that electrons can smoothly enter the third sub-light-emitting layer 63.
- the injection barrier of hole carriers and electron carriers is reduced, which is advantageous for increasing the efficiency of injecting electron carriers and hole carriers into the light-emitting layer, thereby improving organic electricity.
- the luminous efficiency of the light-emitting device due to the above-mentioned energy level matching relationship, the injection barrier of hole carriers and electron carriers is reduced, which is advantageous for increasing the efficiency of injecting electron carriers and hole carriers into the light-emitting layer, thereby improving organic electricity.
- the position of the HOMO of one hole transport layer immediately adjacent to the light-emitting layer is different from the position of the HOMO of the matrix material of the first sub-light-emitting layer 61 (the former is higher than the latter) does not exceed 0.2 ev; or, when the electron transport layer includes two or more sub-electron transport layers, the position of the LUMO of one electron transport layer 8 adjacent to the light-emitting layer and the third sub-light-emitting layer
- the LUMO of the matrix material of 63 differs in position (the former is lower than the latter) and does not exceed 0.2 ev.
- the position of the HOMO of the hole transport layer immediately adjacent to the light-emitting layer is 0.2 ev or less higher than the position of the HOMO of the host material of the first sub-light-emitting layer 61, and the position of the LUMO of the electron transport layer 8 adjacent to the light-emitting layer is higher than that of the third sub-
- the LUMO bit of the matrix material of the light-emitting layer 63 Lower 0.2ev and below.
- the hole transport layer 4 or a hole transport layer adjacent to the light-emitting layer is made of the same material as the matrix material of the first sub-light-emitting layer 61, or the electron transport layer 8 or one of the adjacent light-emitting layers
- the electron transport layer is made of the same material as the matrix material of the third sub-light-emitting layer 63.
- the hole and exciton blocking layer 7 and the electron transporting layer 8 may be made of the same material, and the HOMO of the material is lower than the HOMO of the matrix material having the hole transporting ability in the light emitting layer. s position.
- the hole and exciton blocking layer 7 and the electron transporting layer 8 may be substituted with a phenanthroline derivative, an oxazole derivative, a thiazole derivative, an imidazole derivative, a metal complex, and a derivative of hydrazine.
- Alq3 8-hydroxyquinoline aluminum
- Liq 8-hydroxyquinolate lithium
- 8-hydroxyquinoline gallium bis[2-(2-hydroxyphenyl-1)-pyridine] fluorene, 2-(4-diphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1, 3, 5-tris(N-phenyl-2-phenyl And imidazole-2) benzene (TPBI), BCP, Bphen,
- the holes and the exciton blocking layer 7 and the electron transporting layer 8 may be provided in the same layer, which simultaneously functions as hole blocking, exciton blocking, and electron transport.
- the hole transport layer 4 can be made of an aromatic diamine compound, a triphenylamine compound, an aromatic triamine compound, a biphenyldiamine derivative, a triarylamine polymer, and a carbazole polymer. to make.
- aromatic diamine compound a triphenylamine compound
- aromatic triamine compound a biphenyldiamine derivative
- a triarylamine polymer a carbazole polymer.
- carbazole polymer such as NPB, TPD, TCTA, and polyvinylcarbazole or their monomers.
- the material of the electron blocking layer 5 can be selected in a range that is compatible with the material selection of the hole transport layer 4.
- the hole injection layer 3 may be made of a triphenylamine compound or a P-type doped organic layer or a polymer such as tris-[4-(5-phenyl-2-thienyl)benzene]amine, 4 ,4,4,,-Tris[2-naphthyl(phenyl)tt]triphenylamine (2-TNATA) or 4,4,,4,,-tris-(3-nonylphenylanilino)triphenylamine ( m- MTDATA ), beryllium copper (CuPc), Pedot: Pss, TPD or F4TCNQ.
- a triphenylamine compound or a P-type doped organic layer or a polymer such as tris-[4-(5-phenyl-2-thienyl)benzene]amine, 4 ,4,4,,-Tris[2-naphthyl(phenyl)tt]triphenylamine (2-TNATA) or 4,4,,4,
- the substrate 1 serves as an electrode layer and an organic functional layer, has good light transmission properties in the visible light region, has a certain ability to penetrate water vapor and oxygen, has good surface flatness, and may be glass or A flexible substrate or a TFT back sheet, wherein the flexible substrate can be made of one of a polyester type, a polyimide, or a thin metal.
- the anode layer 2 serves as a connection layer for the forward voltage of the organic electroluminescent device, and has good electrical conductivity, visible light transparency, and a high work function value.
- the anode layer 2 is usually made of an inorganic metal oxide (for example, indium tin oxide ITO, oxidized rhodium, etc.) or an organic conductive polymer (such as PEDOT: PSS, PANI, etc.) or metal materials with high work function values (such as: gold, copper, silver, platinum, etc.).
- the cathode layer 10 serves as a connection layer for the negative voltage of the organic electroluminescent device, and has good electrical conductivity and a low work function value.
- the cathode layer 10 is usually made of a metal material having a low work function value, such as lithium, magnesium, calcium, barium, aluminum, indium, or the like, or a metal material having a low work function value and an alloy of copper, gold, and silver.
- a metal material having a low work function value such as lithium, magnesium, calcium, barium, aluminum, indium, or the like, or a metal material having a low work function value and an alloy of copper, gold, and silver.
- the HOMO of the mixed matrix material is positioned to be the first one.
- the position of the HOMO of the host material of the light-emitting layer 61 is low, so that a part of hole carriers can be collected at the interface of the first sub-light-emitting layer 61 and the second sub-light-emitting layer 62; at the same time, the matrix of the first sub-light-emitting layer 61
- the position of the LUMO of the material is higher than the position of the LUMO of the mixed matrix material of the second sub-light-emitting layer 62, so that a part of the electron carriers can be collected at the above-mentioned interface, so the first sub-light-emitting layer 61 and the second sub-light-emitting layer
- the interface at 62 can form a carrier recombination zone.
- a carrier recombination zone can also be formed at the interface of the second sub-light-emitting layer 62 and the third sub-light-emitting layer 63.
- the matrix material since the matrix material is used, it has a matrix material mixed with two different carrier transporting capabilities, for example, a matrix material having 50% of hole transporting ability and 50% of electrons.
- the carrier material of the transport capability so that the second sub-emissive layer 62 can simultaneously transport two kinds of carriers, and the recombination area of the carriers is wide, so that the light-emitting layer 6 forms a wide carrier recombination zone.
- the concentration of carriers and excitons is reduced, and on the other hand, the range of carrier recombination is increased, thereby improving the efficiency of the organic electroluminescent device and reducing the efficiency at high current density.
- the method of preparing the organic electroluminescent device comprises the following steps.
- the substrate 1 was sequentially washed in a cleaning agent, an ethanol solution, an acetone solution, and deionized water, followed by drying with dry nitrogen.
- the substrate 1 is placed in a vacuum evaporation chamber for the preparation of the anode layer 2 or the cathode layer 10 or other treatment.
- the substrate 1 is transferred into a vacuum evaporation chamber, and an indium tin oxide (ITO) film is formed on the substrate 1, whereby the anode layer 2 of the organic electroluminescent device is formed on the substrate 1. among them,
- ITO indium tin oxide
- the sheet resistance of the ITO film was 25 ⁇ / ⁇ .
- step S1) and the step S2) may be completed in advance to form a corresponding substrate with an anode layer or a cathode layer to facilitate direct utilization in the subsequent processing.
- the substrate 1 on which the anode layer 2 is prepared is moved into a vacuum chamber, and the anode layer 2 is pretreated with oxygen plasma or pretreated with argon plasma to improve the cleanliness and surface smoothness of the ITO film. Degree, improve the surface properties of ITO film and increase its work function value.
- an organic functional layer is prepared on the treated anode layer 2 or cathode layer 10, wherein the light-emitting layer 6 includes three sub-light-emitting layers.
- the treated substrate 1 is transferred into a vacuum chamber, and then an organic functional layer is prepared.
- the evaporation order is as follows: hole injection layer 3, hole transport layer 4, electron blocking layer 5, light-emitting layer 6, hole and exciton blocking layer 7, electron The transport layer 8 and the electron injection layer 9.
- the light emitting layer 6 is a first sub-light emitting layer 61, a second sub-light emitting layer 62, and a third sub-light emitting layer 63 in order from bottom to top.
- the manufacturing process of the luminescent layer 6 includes:
- first sub-emissive layer 61 1) fabricating a first sub-emissive layer 61, the first sub-emissive layer being made of a base material doped luminescent material having a hole transporting ability;
- the third sub-emissive layer 63 is formed on the second sub-emissive layer, the third sub-emissive layer being made of a host material doped luminescent material having electron transporting ability.
- the substrate 1 is placed under high vacuum conditions to prepare the cathode layer 10.
- the vapor deposition rate and thickness of each of the organic functional layers constituting the organic electroluminescent device involved in the above step S2) - step S5) are monitored by a film thickness meter disposed in the vicinity of the substrate.
- the prepared organic electroluminescent device is transferred to a hand-operated box for packaging, and the hand-operated box is inert
- the body atmosphere in this embodiment, is a nitrogen atmosphere.
- a display device comprising the above electroluminescent device.
- the organic electroluminescent device of the present embodiment comprises a substrate 1, an anode layer 2, a cathode layer 10, and an organic functional layer disposed between the anode layer 2 and the cathode layer 10.
- the organic functional layer includes the light-emitting layer 6.
- the structure of the light-emitting layer 6 is the same as that of the light-emitting layer 6 in the first embodiment, that is, the light-emitting layer includes three sub-light-emitting layers (composite regions), that is, the first sub-light-emitting layer 61, The two sub-light emitting layers 62 and the third sub-light emitting layer 63.
- the matrix material of the second sub-light-emitting layer 62 is mixed with a matrix material composed of a matrix material having a hole transporting ability and a matrix material having electron transporting ability; the first sub-light emitting layer 61
- the matrix material is made of a matrix material having a hole transporting ability; and the matrix material in the third sub-light emitting layer 63 is made of a matrix material having electron transporting ability.
- the hole transport layer 4 in the organic functional layer includes two sub-hole transport layers, that is, the hole transport layer includes a first hole transport layer 41 and a second void.
- the hole transport layer 42 and the second hole transport layer 42 are adjacent to the light-emitting layer 6.
- the first hole transport layer 41 is adjacent to the hole injection layer 3
- the second hole transport layer 42 is adjacent to the first sub-light-emitting layer 61.
- the hole injecting layer 3 may not be included in the organic functional layer of the organic electroluminescent device of the present embodiment on the basis of that shown in Fig. 3.
- the organic functional layer of the organic electroluminescent device of the present embodiment may not have the electron blocking layer 5 on the basis of that shown in Fig. 3.
- the electron blocking layer 5 may be provided in practical applications, and the material selection of the electron blocking layer 5 may be the same as that of the hole transport layer 4 in the first embodiment.
- the above-mentioned organic functional layer may include only the hole transport layer 4, the light-emitting layer 6, and the electron transport layer 8.
- the hole transport layer includes a first hole transport layer 41 and a second hole transport layer 42.
- the material of the first hole transport layer 41 is made of the same material as that of the hole transport layer 4 of Embodiment 1; meanwhile, the position of the HOMO (highest occupied track) of the second hole transport layer 42 and the first sub-light-emitting layer 61
- the position of the HOMO is better matched.
- the positions of the energy levels of the two are different by less than 0.2 ev, that is, the position of the HOMO of the second hole transport layer 42 and the first sub-light emitting layer.
- the position of the HOMO of the matrix material of 61 differs by no more than 0.2 ev; and the position of the LUMO (lowest unoccupied orbit) of the matrix material having the hole transporting ability in the second hole transporting layer 42 and the first sub-light emitting layer 61 is higher.
- the position of the LUMO of the host material having the electron transporting ability in the second light emitting layer 62 That is, the position of the HOMO of the second hole transport layer 42 is 0.2 ev or less higher than the position of the HOMO of the matrix material of the first sub-light-emitting layer 61.
- the second hole transport layer 42 is made of the same material as the matrix material of the first sub-light-emitting layer 61, that is, a material having a hole transporting ability.
- the position of the LUMO of the electron transport layer 8 adjacent to the light-emitting layer is 0.2 ev or less lower than the position of the LUMO of the matrix material of the third sub-light-emitting layer 63.
- the hole and exciton blocking layer 7 adjacent to the third sub-light emitting layer 63 and the electron transporting layer 8 are made of the same material as the matrix material of the third sub-light emitting layer 63, that is, the electron transporting ability is used. material.
- the hole transport layer 4 in the embodiment of the present invention may include two or more sub-hole transport layers, the sub-hole transport layer includes at least a first hole transport layer 41, and a second a hole transport layer 42 (not shown), the first hole transport layer 41 is adjacent to the hole injection layer, and the second hole transport layer 42 is adjacent to the first sub-light emitting layer .
- the position of the HOMO of the second hole transport layer 42 is 0.2 ev or less higher than the position of the HOMO of the host material of the first sub-light emitting layer 61.
- the structures of the other layers of the organic electroluminescent device are the same as those of the embodiment 1, and are not described herein again.
- the specific composition of each layer in the organic electroluminescent device is as follows, and the preparation materials and thicknesses of the specific layers are as follows: Glass/ITO/2-TNATA (10 nm) / NPB (20 nm) / TCTA (10 nm) I TCTA: Ir(ppy) 3 (10 nm) / TCTA: TPBI: Ir(ppy) 3 (10 nm) / TPBI: Ir(ppy) 3 (10 nm) / TPBI ( 40 nm ) / LiF (0.5 ⁇ ) / Al (200 ⁇ ).
- the luminescent layer 62 is TCTA: TPBI: Ir(ppy) 3 It is made to have a thickness of 10 nm; the third sub-light-emitting layer 63 is made of TPBI: Ir(ppy) 3 and has a thickness of 10 nm; the hole and exciton blocking layer 7 also serves as an electron transport layer 8 and is made of TPBI.
- the thickness of the electron injecting layer 9 is made of LiF and has a thickness of 0.5 nm; the cathode layer 10 is made of A1 and has a thickness of 200 nm.
- the luminescent materials (ie, dopants) in the three sub-luminescent layers in the composite luminescent layer are all doped with the green phosphorescent dopant Ir(ppy) 3 .
- the substrate 1 was ultrasonically washed successively with a cleaning agent, an acetone solution, and deionized water, and washed and dried with dry nitrogen.
- the substrate 1 on which the anode layer 2 has been formed is subjected to ultraviolet light treatment for 25 minutes to improve the cleanliness and surface flatness of the surface of the ITO film, improve the surface characteristics of the ITO film, and improve the work function value.
- the vapor deposition sequence is as follows: Hole injection layer 3: ⁇ is made of a 2-TNATA material having a thickness of 10 nm and an evaporation rate of 0.08 nm/s; the first hole transport layer 41: ⁇ Made of NPB material, the thickness is 20 nm, the evaporation rate is 0.08 nm / s; The second hole transport layer 42: ⁇ is made of TCTA material, the thickness is 10 nm, the evaporation rate is 0.08 nm / s; In the light-emitting layer 6: the first sub-light-emitting layer 61: the host material is made of TCTA material, wherein the doped luminescent material Ir(ppy) 3 has a thickness of 10 nm and an evaporation rate of 0.08 nm/s; the second sub-luminescent layer 62: The mixed matrix material is a mixed material of TCTA and TPBI, wherein the doped luminescent material Ir(ppy) 3 is a
- the cathode layer 10 was formed by vapor deposition under a high vacuum condition of a vacuum of 5 ⁇ 10 4 .
- the cathode layer 10 is made of metal A1, and its thickness is 200 nm, and the evaporation rate is
- Fig. 4 is a graph showing the current density-current efficiency of the organic electroluminescent device of the present embodiment.
- the organic electroluminescent device of the prior art for example: specific structure: Glass/ITO/2-TNATA (10 ⁇ ) / NPB (20 ⁇ ) / TCTA (10 nm) / TCTA: Ir(ppy) 3 ( 15 nm) / TPBI: Ir(ppy) 3 (15 nm) / TPBI (40 nm ) / LiF (0.5 nm ) / Al (200 nm )
- the three sub-light-emitting layers have a wider composite region in the light-emitting layer, which can effectively reduce exciton quenching and improve the luminous efficiency of the organic electroluminescent device.
- the current efficiency of organic electroluminescent devices is significantly higher than that of prior art organic electroluminescent devices.
- FIG. 6 is a schematic diagram showing the energy level structure of the organic electroluminescent device of the present embodiment.
- the interface between the first sub-emissive layer 61 and the second sub-emissive layer 62 and the interface between the second sub-emissive layer 62 and the third sub-emissive layer 63 are significantly loaded.
- the carrier barrier, a portion of the carriers are blocked at the two interfaces to form a carrier recombination zone.
- the excitons Since the exciton diffusion length is generally less than 10 nm, the excitons generally do not diffuse into the region of the undoped dopant (luminescent material), that is, the main recombination region of the excitons is substantially located inside the luminescent layer, thereby reducing the non-radiative transition.
- the number of excitons avoids the influence of no radiation attenuation on the lifetime of the organic electroluminescent device, and also improves the luminous efficiency of the organic electroluminescent device.
- the injection barrier of the hole ensures that the hole can be efficiently injected into the light-emitting layer; at the same time, the hole and the exciton blocking layer/electron transport layer are respectively made of the same material as the matrix material in the third sub-light-emitting layer 63, thereby ensuring The electrons can be efficiently injected into the light-emitting layer 6, which greatly improves the light-emitting efficiency of the organic electroluminescent device.
- the organic electroluminescent device of this embodiment has the same structure as that of the organic electroluminescent device of Embodiment 2, which differs from Embodiment 2 in that the luminescent materials used in the luminescent layer are different.
- the luminescent material in the luminescent layer is coated with a daunting dopant IrPi, which has a short triplet lifetime (less than 500 nanoseconds), and the dopant content of each of the three sub-luminescent layers is 6%.
- the constituent materials of the organic electroluminescent device in this embodiment are as follows: Glass/ITO/2-TNATA (10 ⁇ ) / NPB (20 ⁇ ) / TCTA (10 ⁇ ) I TCTA: IrPi(10 ⁇ ) I TCTA: TPBI: IrPi (10 ⁇ ) / TPBI (40 ⁇ ) / LiF (0.5 ⁇ ) / Al (200 nm).
- the three sub-light-emitting layers in the light-emitting layer of the present embodiment are: the first sub-light-emitting layer 61 is made of TCTA:IrPi and has a thickness of 10 nm; and the second sub-light-emitting layer 62 is made of TCTA:TPBI:IrPi, The thickness is 10 nm; the third sub-light-emitting layer 63 is made of TPBI: IrPi and has a thickness of 10 nm.
- the luminescent material (dopant) is made of IrPi (green phosphorescent dopant).
- Fig. 7 is a view showing the energy levels of the structure of the organic electroluminescent device of Example 3.
- the organic electroluminescent device has a wide recombination zone which reduces the concentration of carriers and excitons, reduces exciton quenching, and increases hole current carrying. Sub-electron carrier Probability.
- the organic electroluminescent device of Embodiments 1-3 is not only applicable to Embodiment 1 by providing a matrix material having different carrier transporting ability in the light-emitting layer to form a plurality of sub-light-emitting layers.
- the bottom emission type organic electroluminescence device described in 3 is also applicable to a top emission type organic electroluminescence device.
- the efficiency of injecting electron carriers and hole carriers into the light-emitting layer increases the probability of recombination of electron carriers and hole carriers, improves the utilization efficiency of carriers, and finally improves the organic electroluminescent device.
- the luminous efficiency ensures that the organic electroluminescent device still has high current efficiency under high brightness, and the performance of the organic electroluminescent device is improved.
Abstract
Description
Claims
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US20140054570A1 (en) | 2014-02-27 |
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