CN109705666A - A kind of compound ink and preparation method thereof, device - Google Patents
A kind of compound ink and preparation method thereof, device Download PDFInfo
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- CN109705666A CN109705666A CN201711007462.6A CN201711007462A CN109705666A CN 109705666 A CN109705666 A CN 109705666A CN 201711007462 A CN201711007462 A CN 201711007462A CN 109705666 A CN109705666 A CN 109705666A
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Abstract
The present invention discloses a kind of compound ink and preparation method thereof, device, wherein the compound ink includes the p-type metal oxide nano particles and Nanoalloy particle being dispersed in alcohols solvent.The physical properties such as viscosity, surface tension and the boiling point of the compound ink can satisfy present ink jet printing device, and the compound ink can be used for preparing the hole injection layer and/or hole transmission layer of LED lighting device, the compound ink is after solvent anneal volatilization, p-type metal oxide nano particles and the Nanoalloy spheric granules can not will lead to the optical quenching of luminescent material with split-phase；And the compound ink has surface enhanced resonant effect, can be obviously improved the luminous efficiency of LED device.
Description
Technical field
The present invention relates to LED device fields more particularly to a kind of compound ink and preparation method thereof, device.
Background technique
Surface plasma enhancement effect (surface plasma enhancement, SPE) is the another of inorganic nano material
One special nature.For coin race metal, such as gold, silver or copper, the monomer under nano-scale can be to the outer of specific wavelength
The excitation of boundary's electromagnetic wave generates resonance, to achieve the effect that enhance signal.Therefore, the metallic of the Nano grade can
It is widely used in electrooptical device, for example, for luminescence display diode, the nano metal particles bring table
Face enhancement effect can be used for the light of amplification semiconductor material sending, to promote the luminous efficiency of device.
Zinc oxide is as a kind of wide-band gap material, and forbidden energy gap is about 3.37eV at room temperature, and exciton binding energy is high,
Belong to n-type semiconductor.Zinc oxide has the characteristics that light transmittance is high, resistance is small, (such as thin in photoelectric conversion and opto-electronic device
In film solar cell, organic film light emitting diode and quantum dot film light emitting diode) it is used as electron transfer layer, have wide
General and deep application.Similarly, nickel oxide is as wide-band gap material, equally there is outstanding chemical stability and excellent
Light, electricity, magnetic performance；Semiconductor material of the nickel oxide as p-type, is similarly subjected to the attention of semicon industry.Nano oxygen
Change the double grading that zinc has both nano material and macroscopical zinc oxide, the diminution of size is along with Electronic Structure and crystal structure
Variation, produce the skin effect, bulk effect, quantum size effect and macroscopical tunnel effect that macroscopical zinc oxide do not have
It answers, also has the characteristics that polymolecularity, can be dispersed in organic solvent, for the post-production technique carried out based on solution, such as spray
It applies, blade coating, inkjet printing create possibility.
In recent years, have many researchs both at home and abroad to be dedicated to for nano metal particles being supported on nano zine oxide or nickel oxide
In structure, to construct the nanocomposite for taking into account two kinds of material advantages, for manufacturing electron transfer layer or/and hole transport
Layer, to improve photoelectric device efficiency.However, the technique that the prior art uses is the systems such as vapor deposition, vapor deposition or etching mostly
Make at high cost, energy consumption is high, and stock utilization is low and the method that does not meet industrially scalable production requirement；And existing side
Method can't efficiently use the characteristics of nano-particle material is easy to solvation.
Inkjet printing technology has attracted extensive concern in opto-electronic device manufacturing in recent years, especially in film
It is considered as the effective way for solving cost problem and realizing scale in display device manufacturing technology, this technology is in combination with base
Film display screen is made in the functional material of solution and advanced ink jet printing device, can be improved the utilization rate of material, is dropped
Low cost improves production capacity.However, ink jet printing device is higher to the physical property requirements of ink, for example, it is suitable boiling point, viscous
Degree, surface tension and the solute dispersed evenly and stably, bring bigger difficulty to ink formulation；And existing ink pair
The luminous efficiency promotion of device is poor, while must also consider whether ink can be to other knot of device in ink jet printing process
It is configured to change and damage physically or chemically.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of compound ink and preparation method thereof,
Device, it is intended to solve existing ink and easily lead to the optical quenching of luminescent material and physics or change easily are caused to the other structures of device
The problem of learning the change and damage of property.
Technical scheme is as follows:
A kind of compound ink, wherein including the p-type metal oxide nano particles being dispersed in alcohols solvent and Nanoalloy
Grain.
The compound ink, wherein the Nanoalloy particle be gold, silver, aluminium, copper, iron, nickel and platinum in two kinds or
Multiple element alloying pellet.
The compound ink, wherein the Nanoalloy particle is spheric granules.
The compound ink, wherein the diameter of the Nanoalloy spheric granules is 2-100nm.
The compound ink, wherein the p-type metal oxide nano particles are nano nickel oxide particles, nano oxygen
Change molybdenum particle or nano oxidized tungsten particle.
The compound ink, wherein the alcohols solvent is methanol, ethyl alcohol, normal propyl alcohol, isopropanol, n-butanol, 2- fourth
Alcohol, the tert-butyl alcohol or 2- methyl-1-propyl alcohol.
The compound ink, wherein the concentration of the compound ink is 1-100mg/ml.
The compound ink, wherein the viscosity of the compound ink is 3-15cP and/or surface tension is 28-36mN/
m。
A kind of preparation method of compound ink, wherein comprising steps of
A kind of Nanoalloy particle solution is provided；
P-type metal oxide nano particles are dispersed in alcohols solvent, p-type metal oxide nano particles dispersion liquid is obtained；
The p-type metal oxide nano particles dispersion liquid is added in the Nanoalloy particle solution, is mixed to get multiple
Close ink.
A kind of LED device, including first electrode, hole injection layer and/or hole transmission layer, luminescent layer and
Second electrode, wherein the hole injection layer and/or hole transmission layer are prepared using the compound ink of any one of the above.
The utility model has the advantages that compound ink provided by the invention, the physical properties such as viscosity, surface tension and boiling point can expire
The present ink jet printing device of foot, and the compound ink can be used for preparing LED lighting device hole injection layer and/
Or hole transmission layer, the compound ink is after solvent anneal volatilization, p-type metal oxide nano particles and the Nanoalloy
Spheric granules can not will lead to the optical quenching of luminescent material with split-phase；And the compound ink is imitated with surface enhanced resonant
It answers, the luminous efficiency of LED device can be obviously improved.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the preparation method preferred embodiment of compound ink of the present invention；
Fig. 2 is the device luminescent spectrum figure in the embodiment of the present invention 1；
Fig. 3 is the device luminescent spectrum figure in the embodiment of the present invention 2；
Fig. 4 is the device luminescent spectrum figure in the embodiment of the present invention 3.
Specific embodiment
The present invention provides a kind of compound ink and preparation method thereof device, for make the purpose of the present invention, technical solution and
Effect is clearer, clear, and the present invention is described in more detail below.It should be appreciated that specific embodiment described herein
Only to explain the present invention, it is not intended to limit the present invention.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of the preparation method preferred embodiment of compound ink of the present invention, as schemed institute
Show, including step:
S10, a kind of Nanoalloy particle solution is provided；
S20, p-type metal oxide nano particles are dispersed in alcohols solvent, obtain p-type nano-metal-oxide dispersion liquid；
S30, the p-type metal oxide nano particles dispersion liquid is added in the Nanoalloy particle solution, is mixed
To compound ink.
Specifically, inkjet printing technology industrialized as existing thin-film display part, the effective way of large-scale production,
The production capacity that thin-film display part can be significantly improved reduces its production cost.However, since ink jet printing device is to the object of ink
Rationality can and chemical property it is more demanding, such as suitable boiling point, viscosity, surface tension and be uniformly dispersed and stable solute
Deng this brings bigger difficulty to the preparation of ink, and existing ink easily leads to the optical quenching of luminescent material and easily to device
The other structures of part cause change and damage physically or chemically.
To solve the problems of existing ink, present embodiments provide for a kind of preparation methods of compound ink, lead to
Cross and p-type metal oxide nano particles dispersion liquid be added in the Nanoalloy particle solution, mix 20-30h after to get
To compound ink；That is, the compound ink include the p-type metal oxide nano particles that are dispersed in alcohols solvent and
Nanoalloy particle.Due to the metallic particles under nano-scale can the excitation of external electromagnetic wave to specific wavelength generate resonance,
To achieve the effect that enhance signal, therefore, when compound ink provided by the invention is used to prepare LED device,
Surface enhanced effect brought by the Nanoalloy spheric granules can be used for the light of amplifying device luminescent layer sending, to be promoted
The luminous efficiency of device.
The solvent in Nanoalloy particle solution that present embodiment provides is alcohols solvent, in Nanoalloy particle solution
Alcohols solvent it is identical as the alcohols solvent range of choice in p-type metal oxide nano particles dispersion liquid, it is preferable that the alcohol
Class solvent is methanol, ethyl alcohol, normal propyl alcohol, isopropanol, n-butanol, 2- butanol, the tert-butyl alcohol or 2- methyl-1-propyl alcohol etc., but unlimited
In this.
Further, since the coin race metallic particles under nano-scale has the excitation to the external electromagnetic wave of specific wavelength
Resonance is generated, to reach the feature of enhancing signal effect.Different metallic elements is due to its electron energy level and electron density
The resonant wavelength of difference, corresponding excitation of plasma body is not also identical, therefore the composition of the element by changing nano-metal particle
Adjustable resonant wavelength, to achieve the effect that concurrently or separately to enhance different wavelengths of light light intensity.
In the present embodiment, the Nanoalloy particle is two or more in gold, silver, aluminium, copper, iron, nickel and platinum
The solid spherical particle of mischmetal.For example, for the device for emitting short-wavelength light (purple light or black light), it is necessary to using receiving
Rice aluminium leads to nanometer as excitation of plasma body carrier, however since the chemical stability of the aluminium simple substance under nano-scale is poor
Aluminium cannot be used alone, but need to be combined into alloy with other metallic elements such as gold, silver, copper, platinum, can be used as plasma
Excite carrier；Equally, for the device of transmitting long wavelength light (feux rouges or near-infrared), then the copper that chemical stability is poor is needed
Other metallic element component alloys such as metal nanoparticle and gold, silver, aluminium, platinum can be used as excitation of plasma carrier.
Specifically, the Nanoalloy particle that present embodiment uses is spheric granules, with isotropism, that is,
Say the identical spheric granules of these shapes after the excitation for receiving external electromagnetic wave the resonance wave that generates in all directions of space
Uniformly dissipate.
Preferably, the size by adjusting Nanoalloy spheric granules can change the position of formant spectrally, tool
Body, the diameter of the Nanoalloy spheric granules is 2-100nm, in the range, when the diameter of Nanoalloy spheric granules
When bigger, formant is mobile to long wave direction, and when the diameter of Nanoalloy spheric granules is smaller, formant is to shortwave side
To movement.In practical applications, it is corresponding to prepare to select the Nanoalloy spheric granules of suitable size according to actual needs
Luminescent device.
Specifically, two kinds of carriers, i.e. hole in electronics and valence band in conduction band are usually contained in semiconductor, when half
When the electric conductivity of conductor relies primarily on the hole in valence band, then the based semiconductor is known as P-type semiconductor.In present embodiment
In, the P-type semiconductor nano particle is primarily referred to as p-type metal oxide nanoparticles, the p-type metal oxide nano
Grain includes nano nickel oxide particles, nanoscale molybdenum oxide particle or nano oxidized tungsten particle, but not limited to this.With P-type semiconductor oxygen
For changing nickel, nickel oxide has outstanding chemical stability and excellent light, electricity and magnetics as a kind of wide-band gap material
Performance, in thin-film solar cells, organic film light emitting diode and quantum dot film light emitting diode, as hole
Transport layer has extensive and deep application.Further, nano nickel oxide particles are with nano material and macroscopical nickel oxide
Double grading, the diminution of size along with Electronic Structure and crystal structure variation, to produce macroscopical nickel oxide
Skin effect, bulk effect, quantum size effect and the macroscopical tunnel-effect not had；Nano nickel oxide particles also have height
The feature of dispersibility, can be dispersed in organic solvent, for the post-production technique carried out based on solution, such as spraying, blade coating or spray
Ink printing creates possibility.
In one embodiment, by the way that p-type metal oxide nano particles dispersion liquid is added to the Nanoalloy
In spheric granules solution, the compound ink of P-type semiconductor-Nanoalloy is arrived after mixing 20-30h；Present embodiment is preferably mixed
The conjunction time is 24-26h, and the compound ink of P-type semiconductor-Nanoalloy made from mixing 24-26h is used to prepare to the hole of device
Transport layer and/or hole injection layer, the hole transmission layer and/or hole injection layer of compound ink preparation can have through the invention
Effect promotes the transmission in hole, and makes the light issued from luminescent layer, after hole transmission layer and/or hole injection layer, light intensity
Effectively amplified, to promote the luminous efficiency of device.
Further, the concentration of the compound ink of P-type semiconductor-Nanoalloy of present embodiment preparation is in 1-100mg/ml
Between, the concentration refers to the total concentration in a solvent of all solutes in compound ink, and the solute includes p-type nano metal
Oxide particle and Nanoalloy particle；In the compound ink of P-type semiconductor-Nanoalloy, Nanoalloy particle and p-type
The ratio between mole of metal oxide nano particles is 1:(1-1000).Specifically, in order to guarantee that the compound ink has
The semiconductor property of p-type metal oxide itself, present embodiment preferred institute are not influenced while surface resonance reinforcing effect again
The ratio between mole of Nanoalloy particle and p-type metal oxide nano particles is stated for 1:(10-400), preferably, the ratio model
It is still exposed to p-type metal oxide nano particles largely in dicyandiamide solution in enclosing, to fully ensure that composite ink
The dispersibility of water.
Preferably, the compound ink of various concentration can greatly influence the print performance of ink, the present invention passes through experiment card
Bright, when the concentration of the compound ink of P-type semiconductor-Nanoalloy is between 10-60mg/ml, print performance is preferable.
Further, in the step S20, p-type metal oxide nano particles is dispersed in alcohols solvent, are obtained
P-type nano-metal-oxide dispersion liquid；Specifically, during preparing compound ink, the composition of ink itself is to printing
Technologic performance has a very important influence, and in the present invention, the alcohols solvent in the preferably described compound ink is methanol, second
Alcohol, normal propyl alcohol, isopropanol, n-butanol, 2- butanol, the tert-butyl alcohol or 2- methyl-1-propyl alcohol etc., but not limited to this；When described compound
When alcohols solvent in ink is lower alcohol solvent, the lower alcohol solvent has p-type metal oxide nano particles good
Peptizaiton, the solution of clear can be obtained, blocking printer nozzle is avoided, can guarantee prepared compound ink
Stability.
Simultaneously as the chain length of lower alcohol is shorter, the surface potential energy between composite material granular will not be increased considerably, and
It is easy to be detached from composite material in film forming, close structure can be constituted between composite material granular molecule, so that multiple
It is preferable to close ink filming performance；
Preferably, since lower alcohol solvent can not dissolve the sull to have formed a film, therefore composite ink prepared by the present invention
Water will not cause to damage when printing multilayer grading structure to understructure.
To advanced optimize InkJet printing processes, in another embodiment, the alcohols solvent is lower alcohol and height
The mixed solvent of grade alcohol, the present invention are used to prepare compound ink after mixing lower alcohol solvent and higher alcohol solvent, can be effective
Promote the filming performance of compound ink.Specifically, the higher alcohol and lower alcohol molecule can form part of the constant azeotrope combination, make
Compound ink be not easy it is too fast can send out, so that effectively containing that compound ink condense at nozzle leads to solute precipitation plug nozzle
Problem, while azeotropic mixture combination also can avoid compound ink in the drying process, the local turbulence formed by too fast volatilization
Disturb the composite material not yet to form a film.
Further, the higher alcohol molecule can also adjust surface tension and viscosity of compound ink etc. and beat with ink-jet
Print relevant physical property, in the present invention, the higher alcohol solvent be 1,2- butanediol, 1,3-BDO, 1,4-butanediol,
2,3-butanediol, 1,5-PD, glycerine, 1,2,4-butanetriol or 1,2,3- butantriols etc., but not limited to this, pass through control
The surface tension and viscosity of compound ink is adjusted in the dosage of higher alcohol solvent, partly leads preferably, the present invention adjusts the p-type
The viscosity of the compound ink of body-Nanoalloy is 3-15cP and/or surface tension is 28-36mN/m, and saturated vapor pressure is lower than
0.02kPa.It is preferred that the viscosity of the compound ink of P-type semiconductor-Nanoalloy be 6-12cP, surface tension 29-33mN/m,
Saturated vapor pressure is lower than 0.01kPa, and the physical property of the compound ink of P-type semiconductor-Nanoalloy is arranged in the range
It is interior, it may make composite ink water to can adapt to ink-jet and ink droplet volatilization in printing technology and solidify qualitative demand, and can avoid multiple
It closes ink and can not spray in nozzle, a variety of the phenomenon that of being unfavorable for printing such as droplet size is uneven, hangover and coffee ring.
Further, the present invention also provides a kind of LED device, the LED device is beaten by ink-jet
Print technology is prepared, wherein the light emitting diode includes first electrode, hole injection layer and/or hole transmission layer, shines
Layer and second electrode, the hole injection layer and/or hole transmission layer are prepared using above-mentioned compound ink.
The present invention prepares hole transmission layer and/or hole injection layer by compound ink, so that luminescent layer passes through radiation jump
The photon irradiation of generation is moved when on the hole transmission layer and/or hole injection layer, the freely electricity of metal nanoparticle surface
Son interacts with photon, generates local electric field, and the effective electric field in the local electric field and LED device generates resonance,
The recombination luminescence efficiency for promoting luminescent layer, enhances the luminous intensity of LED device.
Explanation is further explained to a kind of preparation method of compound ink of the present invention below by specific embodiment:
Embodiment 1
A kind of compound ink, including dispersing nano nickel oxide particles and nano silver copper alloying pellet in ethanol, the composite ink
The preparation method of water includes:
100mL is prepared, concentration is the ethanol solution of the nano nickel oxide particles of 20mg/mL；
5 mL are prepared, concentration is the ethanol solution for the nano silver copper alloying pellet that 35mg/mL has citrate to protect；
With vigorous stirring, the ethyl alcohol for nano silver copper alloying pellet being added dropwise to the ethanol solution of nano nickel oxide particles is molten
Liquid, and continue stirring 24 hours at room temperature；
It is washed 3 times, is then dispersed again with ethyl alcohol to get nano silver copper particle-compound ink of nano-nickel oxide repeatedly with ethyl alcohol.
Above-mentioned compound ink is deposited into film, tests its UV-Vis spectra graph discovery: being deposited by the compound ink
Film obtained has a stronger absorption peak at 620 nm.
A kind of preparation method of QLED device, including ito anode is provided, it is empty that above-mentioned compound ink production is printed on anode
Cave transport layer；Quantum dot layer is made, wherein dot layer material is to emit the red quantum dot that light is 620 nm；Make Ag electricity
Pole, obtains QLED device, and the luminescent spectrum figure of the QLED device is as shown in Figure 2.
Comparative example 1
A kind of preparation method of QLED device, difference from example 1 is that, hole transmission layer uses nano-nickel oxide material
Material.
QLED device made by embodiment 1 and comparative example 1 is tested under conditions of electric current is 2 mA respectively, is tested
Its brightness, for embodiment 1 compared to comparative example 1, brightness increases to 2265cd/m or so from 2040cd/m.
Embodiment 2
A kind of compound ink, including dispersing nanoscale molybdenum oxide particle and nanometer gold silver alloying pellet in ethanol, the composite ink
The preparation method of water includes:
60mL is prepared, concentration is the ethanol solution of the nanoscale molybdenum oxide particle of 25mg/mL；
15 mL are prepared, concentration is the ethanol solution for the nanometer gold silver alloying pellet that 10mg/mL has citrate to protect；
With vigorous stirring, the ethyl alcohol for nanometer gold silver alloying pellet being added dropwise to the ethanol solution of nanoscale molybdenum oxide particle is molten
Liquid, and continue stirring 24 hours at room temperature；
It is washed 3 times, is then dispersed again with ethyl alcohol to get nanometer gold silver particle-compound ink of nanoscale molybdenum oxide repeatedly with ethyl alcohol.
Above-mentioned compound ink is deposited into film, tests its UV-Vis spectra graph discovery: being deposited by the compound ink
Film obtained has a stronger absorption peak at 450 nm.
A kind of preparation method of QLED device, including ito anode is provided, it is empty that above-mentioned compound ink production is printed on anode
Cave transport layer；Quantum dot layer is made, wherein dot layer material is to emit the blue quantum dot that light is 450 nm；Make Ag electricity
Pole, obtains QLED device, and the luminescent spectrum figure of the QLED device is as shown in Figure 3.
Comparative example 2
A kind of preparation method of QLED device, the difference is that, hole transmission layer uses nano oxidized molybdenum materials with embodiment 2
Material.
QLED device made by embodiment 2 and comparative example 2 is tested under conditions of electric current is 2 mA respectively, is tested
Its brightness, for embodiment 2 compared to comparative example 2, brightness increases to 4271cd/m or so from 3500cd/m.
Embodiment 3
A kind of compound ink, including dispersing nano nickel oxide particles and nano silver aluminum alloy granule in ethanol, the composite ink
The preparation method of water includes:
100mL is prepared, concentration is the ethanol solution of the nano nickel oxide particles of 20mg/mL；
25 mL are prepared, concentration is the ethanol solution for the nano silver aluminum alloy granule that 5mg/mL has citrate to protect；
With vigorous stirring, the ethyl alcohol for nano silver aluminum alloy granule being added dropwise to the ethanol solution of nano nickel oxide particles is molten
Liquid, and continue stirring 24 hours at room temperature；
It is washed 3 times, is then dispersed again with ethyl alcohol to get nano silver alumina particles-compound ink of nano-nickel oxide repeatedly with ethyl alcohol.
Above-mentioned compound ink is deposited into film, tests its UV-Vis spectra graph discovery: being deposited by the compound ink
Film obtained has a stronger absorption peak at 420 nm.
A kind of preparation method of QLED device, including ito anode is provided, it is empty that above-mentioned compound ink production is printed on anode
Cave transport layer；Quantum dot layer is made, wherein dot layer material is to emit the purple quantum dot that light is 420 nm；Make Ag electricity
Pole, obtains QLED device, and the luminescent spectrum figure of the QLED device is as shown in Figure 4.
Comparative example 3
A kind of preparation method of QLED device, the difference is that, hole transmission layer uses nano-nickel oxide material with embodiment 3
Material.
QLED device made by embodiment 3 and comparative example 3 is tested under conditions of electric current is 2 mA respectively, is tested
Its brightness, for embodiment 3 compared to comparative example 3, brightness increases to 460cd/m or so from 400cd/m.
In conclusion the present invention provides a kind of compound ink and preparation method thereof, device, the viscosity of the compound ink,
The physical properties such as surface tension and boiling point can satisfy present ink jet printing device, and the compound ink can be used for making
The hole injection layer and/or hole transmission layer of standby LED lighting device, the compound ink is after solvent anneal volatilization, p-type
Metal oxide nano particles and the Nanoalloy spheric granules can not will lead to the optical quenching of luminescent material with split-phase；And
And the compound ink has surface enhanced resonant effect, can be obviously improved the luminous efficiency of LED device.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of compound ink, which is characterized in that including the p-type metal oxide nano particles being dispersed in alcohols solvent and receive
Rice alloying pellet.
2. compound ink according to claim 1, which is characterized in that the Nanoalloy particle be gold, silver, aluminium, copper,
Two or more mischmetal particles in iron, nickel and platinum.
3. compound ink according to claim 1 or 2, which is characterized in that the Nanoalloy particle is spheric granules.
4. compound ink according to claim 3, which is characterized in that the diameter of the Nanoalloy spheric granules is 2-
100nm。
5. compound ink according to claim 1, which is characterized in that the p-type metal oxide nano particles are nanometer
Nickel oxide particle, nanoscale molybdenum oxide particle or nano oxidized tungsten particle.
6. compound ink according to claim 1, which is characterized in that the alcohols solvent be methanol, ethyl alcohol, normal propyl alcohol,
Isopropanol, n-butanol, 2- butanol, the tert-butyl alcohol or 2- methyl-1-propyl alcohol.
7. compound ink according to claim 1, which is characterized in that the concentration of the compound ink is 1-100mg/ml.
8. compound ink according to claim 1, which is characterized in that the viscosity of the compound ink be 3-15cP and/or
Surface tension is 28-36mN/m.
9. a kind of preparation method of compound ink, which is characterized in that comprising steps of
A kind of Nanoalloy particle solution is provided；
P-type metal oxide nano particles are dispersed in alcohols solvent, p-type metal oxide nano particles dispersion liquid is obtained；
The p-type metal oxide nano particles dispersion liquid is added in the Nanoalloy particle solution, is mixed to get multiple
Close ink.
10. a kind of LED device, including first electrode, hole injection layer and/or hole transmission layer, luminescent layer and
Two electrodes, which is characterized in that the hole injection layer and/or hole transmission layer are using any one in the claim 1-8
Compound ink is prepared.
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