CN103427025B - A kind of organic electroluminescence device and preparation method thereof - Google Patents
A kind of organic electroluminescence device and preparation method thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of organic electroluminescence device, this organic electroluminescence device has inverted structure, include substrate of glass, negative electrode, electron injecting layer, electron transfer layer, luminescent layer, hole transmission layer, hole injection layer and anode successively, the material of electron transfer layer is poly-3, the composite material that 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, in the material of electron transfer layer, the doping mass fraction of charcoal-aero gel is 0.1 ~ 1%. Separately, the preparation method that the embodiment of the invention also discloses a kind of organic electroluminescence device. Organic electroluminescence device provided by the invention, by being arranged on inverted negative electrode by charcoal-aero gel suspension, improves light extraction efficiency, simultaneously because charcoal-aero gel not easily reacts with air, is effectively increased device stability. Organic electroluminescence device preparation method provided by the invention, technique is simple, is suitable for large-scale industrial production.
Description
Technical field
The present invention relates to electronic device association area, particularly relate to a kind of organic electroluminescence device and preparation method thereof.
Background technology
1987, C.W.Tang and the VanSlyke of EastmanKodak company of the U.S. reported the breakthrough in organic electroluminescent research. Ultrathin film technology is utilized to prepare high brightness, high efficiency double-deck organic electroluminescence device (OLED). In this double-deck device, under 10V, brightness reaches 1000cd/m2, its luminous efficiency is that 1.51lm/W, life-span were more than 100 hours.
The principle of luminosity of OLED is based under the effect of extra electric field, and electronics is injected into organic lowest unocccupied molecular orbital (LUMO) from negative electrode, and hole is injected into organic highest occupied molecular orbital (HOMO) from anode. Meet at luminescent layer in electronics and hole, compound, formation exciton, and exciton migrates under electric field action, transfer energy to luminescent material, and excite electronics from ground state transition to excited state, and excited energy passes through Radiation-induced deactivation, produce photon, discharge luminous energy.
In traditional luminescent device, being typically all with anode glass substrate for exiting surface, in this structure, the outgoing of light can first pass through the absorption reflection of anode conducting material, carry out subvitreous absorption and a reflection again, finally just can shine in air, and owing to glass surface is more smooth, and thickness of glass is bigger, light path is made to strengthen, so that more light reflects away toward glass both sides, cause the probability of the light shining device in glass to decline, finally affect luminous efficiency. Therefore, it is very low that light shines the exitance in air, and most light is all lost in device inside, and the luminous efficiency making this kind of luminescent device is all on the low side.
Summary of the invention
Embodiment of the present invention technical problem to be solved is in that, a kind of organic electroluminescence device and preparation method thereof is provided, by charcoal-aero gel suspension is arranged on inverted negative electrode, improve light extraction efficiency, simultaneously because charcoal-aero gel not easily reacts with air, it is effectively increased device stability.
Embodiments provide a kind of organic electroluminescence device, this organic electroluminescence device has inverted structure, include substrate of glass, negative electrode, electron injecting layer, electron transfer layer, luminescent layer, hole transmission layer, hole injection layer and anode successively, the material of described electron transfer layer is poly-3, the composite material that 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, in the material of described electron transfer layer, the doping mass fraction of described charcoal-aero gel is 0.1 ~ 1%.
Preferably, substrate of glass is commercially available simple glass.
Preferably, negative electrode is silver (Ag), aluminum (Al), platinum (Pt) or gold (Au); It is highly preferred that negative electrode is silver (Ag).
Preferably, the thickness of negative electrode is 5 ~ 20nm; It is highly preferred that the thickness of negative electrode is 10nm.
Preferably, the material of electron injecting layer is cesium carbonate (Cs2CO3), cesium fluoride (CsF) or lithium fluoride (LiF); It is highly preferred that the material of electron injecting layer is cesium fluoride (CsF).
Preferably, the thickness of electron injecting layer is 1 ~ 20nm; It is highly preferred that the thickness of electron injecting layer is 10nm.
The material of electron transfer layer is the composite material that poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, and in the material of electron transfer layer, the doping mass fraction of charcoal-aero gel is 0.1 ~ 1%.
Preferably, charcoal-aero gel is central hole structure, and aperture is 20 ~ 200nm.
Charcoal-aero gel is central hole structure, aperture is bigger, electron transfer layer as organic electroluminescence device is arranged on inverted negative electrode, be conducive to the transmission of electronics, electric conductivity is good, when adopting inverted structure, electron transfer layer is in substrate of glass side, and light is from this direction outgoing, after electron transfer layer, owing to charcoal-aero gel aperture is bigger, light can being scattered, go back other granular boundaries by the light scattering being partially larger than critical angle, makes the angle of light of this part within critical angle range, such that it is able to shine in air, it is effectively improved light extraction efficiency. Simultaneously as charcoal-aero gel is pure metals, purity is high, and synthesis cost is low, and stable in properties not easily reacts with air, can be effectively improved luminescent device stability.
Preferably, the mass fraction of poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) is 1 ~ 10%.
Preferably, the thickness of electron transfer layer is 200 ~ 400nm.
In the material of electron transfer layer, poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) is main body, and charcoal-aero gel is object.
Preferably, poly-3,4-dioxyethylene thiophene (PEDOT) described in poly-3,4-dioxyethylene thiophene (PEDOT)/polyphenyl sulfonate (PSS) aqueous solution are 2:1 with the mass ratio of described polyphenyl sulfonate (PSS).
Preferably, the material of luminescent layer is the composite material that electron transport material doped luminescent material is formed.
Preferably, electron transport material is 4,7-diphenyl-1,10-phenanthroline (Bphen) or N-aryl benzimidazole (TPBI).
Preferably, luminescent material is double; two (4,6-difluorophenyl pyridinato-N, C2) pyridinecarboxylic closes iridium (FIrpic), two (2-methyl-diphenyl [f, h] quinoxaline) (acetylacetone,2,4-pentanediones) close iridium (Ir (MDQ)2(acac)) or three (2-phenylpyridines) close iridium (Ir (ppy)3)��
Preferably, the material of luminescent layer is that N-aryl benzimidazole (TPBI) three (the 2-phenylpyridines) that adulterate close iridium (Ir (ppy)3) composite material that formed.
Preferably, in the material of luminescent layer, the doping mass fraction of luminescent material is 1%-20%; It is highly preferred that in the material of luminescent layer, the doping mass fraction of luminescent material is 10%.
Preferably, the thickness of luminescent layer is 5 ~ 30nm; It is highly preferred that the thickness of luminescent layer is 20nm.
Preferably, the hole mobile material of hole transmission layer is 1,1-bis-[4-[N, N '-two (p-tolyl) amino] phenyl] hexamethylene (TAPC), 4,4 ', 4 "-three (carbazole-9-base) triphenylamine (TCTA), N, N '-(1-naphthyl)-N; N '-diphenyl-4,4 '-benzidine (NPB); It is highly preferred that the hole mobile material of hole transmission layer is 1,1-bis-[4-[N, N '-two (p-tolyl) amino] phenyl] hexamethylene (TAPC).
Preferably, the thickness of hole transmission layer is 20 ~ 60nm; It is highly preferred that the thickness of hole transmission layer is 50nm.
Preferably, the material of hole injection layer is molybdenum trioxide (MoO3), Tungstic anhydride. (WO3) or vanadic anhydride (V2O5); It is highly preferred that the material of hole injection layer is Tungstic anhydride. (WO3).
Preferably, the thickness of hole injection layer is 20 ~ 80nm; It is highly preferred that the thickness of hole injection layer is 40nm.
Preferably, anode is silver (Ag), aluminum (Al), platinum (Pt) or gold (Au); It is highly preferred that anode is aluminum (Al).
Preferably, the thickness of anode is 80 ~ 300nm; It is highly preferred that the thickness of anode is 150nm.
Correspondingly, the preparation method that the embodiment of the present invention additionally provides a kind of organic electroluminescence device, comprise the following steps:
There is provided the substrate of glass of cleaning, evaporation cathode and electron injecting layer successively in processed substrate of glass;
On described electron injecting layer, electron transfer layer is prepared in coating, the material of described electron transfer layer is poly-3, the composite material that 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, in the material of described electron transfer layer, the doping mass fraction of described charcoal-aero gel is 0.1 ~ 1%;
It is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
Preferably, substrate of glass is commercially available simple glass.
Specifically, the clean operation of substrate of glass is: substrate of glass is carried out photoetching treatment, is cut into required size, successively with liquid detergent, and deionized water, acetone, ethanol, each ultrasonic 15min of isopropanol, removes the organic pollution of glass surface.
Preferably, negative electrode is silver (Ag), aluminum (Al), platinum (Pt) or gold (Au); It is highly preferred that negative electrode is silver (Ag).
Preferably, the thickness of negative electrode is 5 ~ 20nm; It is highly preferred that the thickness of negative electrode is 10nm.
Preferably, the evaporation of negative electrode is vacuum evaporation, and evaporation temperature is 500 ~ 1000 DEG C, and vacuum is 1 �� 10-3��1 �� 10-5Pa��
Preferably, the material of electron injecting layer is cesium carbonate (Cs2CO3), cesium fluoride (CsF) or lithium fluoride (LiF); It is highly preferred that the material of electron injecting layer is cesium fluoride (CsF).
Preferably, the thickness of electron injecting layer is 1 ~ 20nm; It is highly preferred that the thickness of electron injecting layer is 10nm.
Preferably, the evaporation of electron injecting layer is vacuum evaporation, and evaporation temperature is 100 ~ 500 DEG C, and vacuum is 1 �� 10-3��1 �� 10-5Pa��
The material of electron transfer layer is the composite material that poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, and in the material of electron transfer layer, the doping mass fraction of charcoal-aero gel is 0.1 ~ 1%.
Preferably, electron transfer layer adopts the mode of spin coating or blade coating to be arranged on electron injecting layer.
Preferably, in spin coating process, rotating speed is 500 ~ 6000 revs/min, and the time is 5 ~ 30s.
Preferably, after electron transfer layer preparation, baking oven is adopted to dry.
Preferably, charcoal-aero gel is central hole structure, and aperture is 20 ~ 200nm.
Preferably, the mass fraction of poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) is 1 ~ 10%.
Preferably, the thickness of electron transfer layer is 200 ~ 400nm.
In the material of electron transfer layer, poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) is main body, and charcoal-aero gel is object.
Preferably, poly-3,4-dioxyethylene thiophene (PEDOT) described in poly-3,4-dioxyethylene thiophene (PEDOT)/polyphenyl sulfonate (PSS) aqueous solution are 2: 1 with the mass ratio of described polyphenyl sulfonate (PSS).
It is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively.
Preferably, the material of luminescent layer is the composite material that electron transport material doped luminescent material is formed.
Preferably, electron transport material is 4,7-diphenyl-1,10-phenanthroline (Bphen) or N-aryl benzimidazole (TPBI).
Preferably, luminescent material is double; two (4,6-difluorophenyl pyridinato-N, C2) pyridinecarboxylic closes iridium (FIrpic), two (2-methyl-diphenyl [f, h] quinoxaline) (acetylacetone,2,4-pentanediones) close iridium (Ir (MDQ)2(acac)) or three (2-phenylpyridines) close iridium (Ir (ppy)3)��
Preferably, the material of luminescent layer is that N-aryl benzimidazole (TPBI) three (the 2-phenylpyridines) that adulterate close iridium (Ir (ppy)3) composite material that formed.
Preferably, in the material of luminescent layer, the doping mass fraction of luminescent material is 1%-20%; It is highly preferred that in the material of luminescent layer, the doping mass fraction of luminescent material is 10%.
Preferably, the thickness of luminescent layer is 5 ~ 30nm; It is highly preferred that the thickness of luminescent layer is 20nm.
Preferably, the hole mobile material of hole transmission layer is 1,1-bis-[4-[N, N '-two (p-tolyl) amino] phenyl] hexamethylene (TAPC), 4,4 ', 4 "-three (carbazole-9-base) triphenylamine (TCTA), N, N '-(1-naphthyl)-N; N '-diphenyl-4,4 '-benzidine (NPB); It is highly preferred that the hole mobile material of hole transmission layer is 1,1-bis-[4-[N, N '-two (p-tolyl) amino] phenyl] hexamethylene (TAPC).
Preferably, the thickness of hole transmission layer is 20 ~ 60nm; It is highly preferred that the thickness of hole transmission layer is 50nm.
Preferably, the material of hole injection layer is molybdenum trioxide (MoO3), Tungstic anhydride. (WO3) or vanadic anhydride (V2O5); It is highly preferred that the material of hole injection layer is Tungstic anhydride. (WO3).
Preferably, the thickness of hole injection layer is 20 ~ 80nm; It is highly preferred that the thickness of hole injection layer is 40nm.
Preferably, the evaporation of luminescent layer, hole transmission layer and hole injection layer is vacuum evaporation, and evaporation temperature is 100 ~ 500 DEG C, and vacuum is 1 �� 10-3��1 �� 10-5Pa��
Preferably, anode is silver (Ag), aluminum (Al), platinum (Pt) or gold (Au); It is highly preferred that anode is aluminum (Al).
Preferably, the thickness of anode is 80 ~ 300nm; It is highly preferred that the thickness of anode is 150nm.
Preferably, the evaporation of anode is vacuum evaporation, and evaporation temperature is 500 ~ 1000 DEG C, and vacuum is 1 �� 10-3~1��10-5Pa��
Implement the embodiment of the present invention, have the advantages that
(1) organic electroluminescence device with inverted structure provided by the invention, electron transfer layer utilizes the material charcoal-aero gel and poly-3 of nanostructured, 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) carries out doping preparation, it is arranged on inverted negative electrode, make charcoal-aero gel electron transfer layer in substrate of glass side, light is scattered, improves light extraction efficiency;
(2) organic electroluminescence device with inverted structure provided by the invention, owing to charcoal-aero gel is pure metals, purity is high, synthesis cost is low, and stable in properties not easily reacts with air, can being effectively improved luminescent device stability, technique is simple, is suitable for large-scale industrial production.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure chart of the organic electroluminescence device that the embodiment of the present invention 1 provides;
Fig. 2 is the graph of a relation of the organic electroluminescence device of the embodiment of the present invention 1 offer voltage with comparative example's organic electroluminescence device and brightness.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1
The preparation method of a kind of organic electroluminescence device, comprises the following steps:
(1) by substrate of glass successively with liquid detergent, deionized water, ultrasonic 15min, removes the organic pollution of glass surface, evaporation cathode and electron injecting layer successively in processed substrate of glass;
Negative electrode is silver (Ag), and thickness is 10nm. The material of electron injecting layer is cesium fluoride (CsF), and thickness is 10nm; The evaporation of negative electrode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa. The evaporation of electron injecting layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa��
(2) on electron injecting layer, electron transfer layer is prepared in spin coating, is then placed on oven for drying moisture.
Specifically, in the present embodiment, the material of electron transfer layer is mass fraction be 6% poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) adulterate charcoal-aero gel formed composite material, wherein, poly-3,4-dioxyethylene thiophene (PEDOT) are 2: 1 with the mass ratio of polyphenyl sulfonate (PSS), the doping mass fraction of charcoal-aero gel is 0.5%, and the aperture of charcoal-aero gel is 40nm; The thickness of electron transfer layer is 300nm. In spin coating process, rotating speed is 2000 revs/min, and the time is 18s.
(3) it is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
The evaporation of luminescent layer, hole transmission layer and hole injection layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa. The evaporation of anode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa��
Wherein, the material of luminescent layer is TPBi doping (Ir (ppy)3) composite material (TPBi:(Ir (ppy) that formed3)), (Ir (ppy)3) doping mass fraction be 10%, light emitting layer thickness is 20nm; The material of hole transmission layer is TAPC, and thickness is 50nm; The material of hole injection layer is Tungstic anhydride. (WO3), thickness is 40nm; Anode is aluminum (Al), and thickness is 150nm.
Fig. 1 is the structural representation of the organic electroluminescence device of the present embodiment. As it is shown in figure 1, the structure of this organic electroluminescence device includes, substrate of glass 10, negative electrode 20, electron injecting layer 30, electron transfer layer 40, luminescent layer 50, hole transmission layer 60, hole injection layer 70 and anode 80. Wherein, the material of electron transfer layer is mass fraction be 6% poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) adulterate the composite material that charcoal-aero gel formed, the thickness of electron transfer layer is 300nm. The structure of this organic electroluminescence device is: simple glass/Ag/CsF/(PEDOT/PSS): charcoal-aero gel (0.5wt%)/TPBi:(Ir (ppy)3) (10wt%)/TAPC/WO3/Al��
In order to the good characteristic of embodiment of the present invention organic electroluminescence device is better described, spy arranges following comparative example:
Preparing organic electroluminescence device, structure is: ITO/WO3/TAPC/TPBi:(Ir(ppy)3) (10wt%)/Bphen/CsF/Ag. Concrete preparation process is: by ito glass substrate successively with liquid detergent, deionized water, ultrasonic 15min, remove the organic pollution of glass surface, then substrate is moved in vacuum coating system, be deposited with hole injection layer, hole transmission layer, luminescent layer, electron transfer layer, electron injecting layer and negative electrode successively. Wherein, the material of hole injection layer is WO3, thickness is 40nm; The material of hole transmission layer is TAPC, and thickness is 50nm; The material of luminescent layer is TPBi:Ir (ppy)3, Ir (ppy)3Doping ratio be 10%, thickness is 20nm; The material of electron transfer layer is Bphen, and thickness is 300nm; The material of electron injecting layer is CsF, and thickness is 10nm; Negative electrode is Ag, and thickness is 150nm. Finally obtain required electroluminescent device.
Fig. 2 is the graph of a relation of the organic electroluminescence device of the present embodiment and the voltage of comparative example's organic electroluminescence device with brightness. Wherein, curve 1 is the voltage graph of a relation with brightness of the present embodiment organic electroluminescence device; Curve 2 is the voltage graph of a relation with brightness of comparative example's organic electroluminescence device.
From fig. 2 it can be seen that under the voltage of 8 ~ 16V, the brightness of the present embodiment organic electroluminescence device all big than comparative example organic electroluminescence device, wherein, under the voltage of 10V, the brightness of the present embodiment organic electroluminescence device is 3830cd/m2, and comparative example be only 2380cd/m2. This explanation, there is the charcoal-aero gel electron transfer layer as device of central hole structure, aperture is bigger, be conducive to the transmission of electronics, when adopting inverted structure, owing to charcoal-aero gel aperture is relatively big, light can be scattered, go back other granular boundaries by the light scattering being partially larger than critical angle, improves light extraction efficiency.
Embodiment 2
The preparation method of a kind of organic electroluminescence device, comprises the following steps:
(1) by substrate of glass successively with liquid detergent, deionized water, ultrasonic 15min, removes the organic pollution of glass surface, evaporation cathode and electron injecting layer successively in processed substrate of glass;
Negative electrode is aluminum (Al), and thickness is 5nm. The material of electron injecting layer is lithium fluoride (LiF), and thickness is 20nm; The evaporation of negative electrode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa. The evaporation of electron injecting layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa��
(2) on electron injecting layer, electron transfer layer is prepared in spin coating, is then placed on oven for drying moisture.
Specifically, in the present embodiment, the material of electron transfer layer is mass fraction be 1% poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) adulterate charcoal-aero gel formed composite material, wherein, poly-3,4-dioxyethylene thiophene (PEDOT) are 2:1 with the mass ratio of polyphenyl sulfonate (PSS), the doping mass fraction of charcoal-aero gel is 0.1%, and the aperture of charcoal-aero gel is 200nm; The thickness of electron transfer layer is 400nm. In spin coating process, rotating speed is 500 revs/min, and the time is 5s.
(3) it is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
The evaporation of luminescent layer, hole transmission layer and hole injection layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa. The evaporation of anode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa��
Wherein, the material of luminescent layer is TPBi doping (Ir (MDQ)2(acac) composite material (TPBi:(Ir (MDQ)) formed2(acac))), (Ir (MDQ)2(acac) doping mass fraction) is 2%, and light emitting layer thickness is 20nm; The material of hole transmission layer is TCTA, and thickness is 60nm; The material of hole injection layer is V2O5, thickness is 20nm; Anode is silver (Ag), and thickness is 300nm.
The structure of the organic electroluminescence device that the present embodiment provides is: simple glass/Al/LiF/(PEDOT/PSS): charcoal-aero gel (0.1wt%)/TPBi:(Ir (MDQ)2(acac)) (2wt%)/TCTA/V2O5/ Ag, under the voltage of 10V, the brightness of the present embodiment organic electroluminescence device is 2456cd/m2��
Embodiment 3
The preparation method of a kind of organic electroluminescence device, comprises the following steps:
(1) by substrate of glass successively with liquid detergent, deionized water, ultrasonic 15min, removes the organic pollution of glass surface, evaporation cathode and electron injecting layer successively in processed substrate of glass;
Negative electrode is platinum (Pt), and thickness is 20nm. The material of electron injecting layer is cesium carbonate (Cs2CO3), thickness is 15nm; The evaporation of negative electrode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa. The evaporation of electron injecting layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa��
(2) on electron injecting layer, electron transfer layer is prepared in spin coating, is then placed on oven for drying moisture.
Specifically, in the present embodiment, the material of electron transfer layer is mass fraction be 10% poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) adulterate charcoal-aero gel formed composite material, wherein, poly-3,4-dioxyethylene thiophene (PEDOT) are 2: 1 with the mass ratio of polyphenyl sulfonate (PSS), the doping mass fraction of charcoal-aero gel is 2%, and the aperture of charcoal-aero gel is 20nm; The thickness of electron transfer layer is 200nm. In spin coating process, rotating speed is 6000 revs/min, and the time is 30s.
(3) it is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
The evaporation of luminescent layer, hole transmission layer and hole injection layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa. The evaporation of anode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa��
Wherein, the material of luminescent layer is the TPBi doping FIrpic composite material (TPBi:FIrpic) formed, and the doping mass fraction of FIrpic is 20%, and light emitting layer thickness is 30nm; The material of hole transmission layer is NPB, and thickness is 20nm; The material of hole injection layer is molybdenum trioxide (MoO3), thickness is 80nm; Anode is gold (Au), and thickness is 100nm.
The structure of the organic electroluminescence device that the present embodiment provides is: simple glass/Pt/Cs2CO3/ NPB/MoO/(PEDOT/PSS): charcoal-aero gel (2wt%)/TPBi:FIrpic(20wt%)3/ Au, under the voltage of 10V, the brightness of the present embodiment organic electroluminescence device is 3152cd/m2��
Embodiment 4
The preparation method of a kind of organic electroluminescence device, comprises the following steps:
(1) by substrate of glass successively with liquid detergent, deionized water, ultrasonic 15min, removes the organic pollution of glass surface, evaporation cathode and electron injecting layer successively in processed substrate of glass;
Negative electrode is gold (Au), and thickness is 15nm. The material of electron injecting layer is lithium fluoride (LiF), and thickness is 1nm; The evaporation of negative electrode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa. The evaporation of electron injecting layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa��
(2) on electron injecting layer, electron transfer layer is prepared in spin coating, is then placed on oven for drying moisture.
Specifically, in the present embodiment, the material of electron transfer layer is mass fraction be 10% poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution (PEDOT/PSS) adulterate charcoal-aero gel formed composite material, wherein, poly-3,4-dioxyethylene thiophene (PEDOT) are 2: 1 with the mass ratio of polyphenyl sulfonate (PSS), the doping mass fraction of charcoal-aero gel is 2%, and the aperture of charcoal-aero gel is 150nm; The thickness of electron transfer layer is 200nm. In spin coating process, rotating speed is 3500 revs/min, and the time is 15s
(3) it is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
The evaporation of luminescent layer, hole transmission layer and hole injection layer is vacuum evaporation, and evaporation temperature is 400 DEG C, and vacuum is 1 �� 10-5Pa. The evaporation of anode is vacuum evaporation, and evaporation temperature is 800 DEG C, and vacuum is 1 �� 10-4Pa��
Wherein, the material of luminescent layer is Bphen doping (Ir (ppy)3) composite material (Bphen:(Ir (ppy) that formed3)), (Ir (ppy)3) doping mass fraction be 6%, light emitting layer thickness is 12nm; The material of hole transmission layer is TAPC, and thickness is 45nm; The material of hole injection layer is molybdenum trioxide (MoO3), thickness is 45nm; Anode is gold (Au), and thickness is 120nm.
The structure of the organic electroluminescence device that the present embodiment provides is: simple glass/Au/LiF/(PEDOT/PSS): charcoal-aero gel (2wt%)/Bphen:(Ir (ppy)3) (6wt%)/TAPC/MoO3/ Au, under the voltage of 10V, the brightness of the present embodiment organic electroluminescence device is 3670cd/m2��
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. an organic electroluminescence device, it is characterized in that, described organic electroluminescence device has inverted structure, include substrate of glass, negative electrode, electron injecting layer, electron transfer layer, luminescent layer, hole transmission layer, hole injection layer and anode successively, the material of described electron transfer layer is poly-3, the composite material that 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, in the material of described electron transfer layer, the doping mass fraction of described charcoal-aero gel is 0.1��1%.
2. organic electroluminescence device as claimed in claim 1, it is characterised in that described charcoal-aero gel is central hole structure, and aperture is 20��200nm.
3. organic electroluminescence device as claimed in claim 1, it is characterised in that the mass fraction of described poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution is 1��10%.
4. organic electroluminescence device as claimed in claim 3, it is characterised in that described in described poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution, poly-3,4-dioxyethylene thiophene are 2:1 with the mass ratio of described polyphenyl sulfonate.
5. organic electroluminescence device as claimed in claim 1, it is characterised in that the thickness of described electron transfer layer is 200��400nm.
6. the preparation method of an organic electroluminescence device, it is characterised in that comprise the following steps:
There is provided the substrate of glass of cleaning, evaporation cathode and electron injecting layer successively in processed substrate of glass;
On described electron injecting layer, electron transfer layer is prepared in coating, the material of described electron transfer layer is poly-3, the composite material that 4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution doping charcoal-aero gel is formed, in the material of described electron transfer layer, the doping mass fraction of described charcoal-aero gel is 0.1��1%;
It is deposited with luminescent layer, hole transmission layer, hole injection layer and metal anode on the electron transport layer successively, obtains organic electroluminescence device.
7. the preparation method of organic electroluminescence device as claimed in claim 6, it is characterised in that described charcoal-aero gel is central hole structure, and aperture is 20��200nm.
8. the preparation method of organic electroluminescence device as claimed in claim 6, it is characterised in that the mass fraction of described poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution is 1��10%.
9. the preparation method of organic electroluminescence device as claimed in claim 6, it is characterised in that described in described poly-3,4-dioxyethylene thiophene/polyphenyl sulfonate aqueous solution, poly-3,4-dioxyethylene thiophene are 2:1 with the mass ratio of described polyphenyl sulfonate.
10. the preparation method of organic electroluminescence device as claimed in claim 6, it is characterised in that the thickness of described electron transfer layer is 200��400nm.
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| CN101359722A (en) * | 2008-09-23 | 2009-02-04 | 吉林大学 | Encapsulation method for top radiation organic EL part |
| CN101562077A (en) * | 2009-05-11 | 2009-10-21 | 湘潭大学 | Carbon aerogel composite pair electrode used for dye-sensitized solar cell and preparation method thereof |
| CN101647134A (en) * | 2007-03-30 | 2010-02-10 | 密执安州立大学董事会 | OLED with improved light outcoupling |
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| CN101359722A (en) * | 2008-09-23 | 2009-02-04 | 吉林大学 | Encapsulation method for top radiation organic EL part |
| CN101562077A (en) * | 2009-05-11 | 2009-10-21 | 湘潭大学 | Carbon aerogel composite pair electrode used for dye-sensitized solar cell and preparation method thereof |
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