CN110041544B - Method for processing PEDOT-PSS, quantum dot light-emitting diode and display device - Google Patents

Method for processing PEDOT-PSS, quantum dot light-emitting diode and display device Download PDF

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CN110041544B
CN110041544B CN201910391856.9A CN201910391856A CN110041544B CN 110041544 B CN110041544 B CN 110041544B CN 201910391856 A CN201910391856 A CN 201910391856A CN 110041544 B CN110041544 B CN 110041544B
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苏亮
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Guangdong Juhua Printing Display Technology Co Ltd
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Abstract

The invention discloses a PEDOT-PSS processing method, a quantum dot light-emitting diode and a display device, and relates to the technical field of conductive materials. The method for processing PEDOT-PSS comprises the following steps: PEDOT-PSS materials are treated with a salt solution containing cations having a positive softness parameter to phase separate the PEDOT from the PSS. The invention aims to provide a method for improving the conductivity of PEDOT-PSS.

Description

Method for processing PEDOT-PSS, quantum dot light emitting diode and display device
Technical Field
The invention relates to the technical field of conductive materials, in particular to a method for processing PEDOT-PSS, a quantum dot light-emitting diode and a display device.
Background
At present, flexible, foldable, wearable and transparent electronic products increasingly catch the eye of people, and conductive polymer materials become an ideal choice for replacing brittle ITO transparent electrodes due to the advantages of good light transmission, flexibility and the like.
Polyethylene dioxythiophene (PEDOT) and poly (phenylene sulfonate) (PSS) are dissolved in water by mixing in a certain proportion, and a uniformly dispersed PEDOT-PSS solution can be formed. The PEDOT-PSS film prepared from the PEDOT-PSS solution has good flexibility and stability, and has high transparency in a visible light range, and the work function of the PEDOT-PSS is generally 5.0-5.1 eV, so that hole injection is facilitated. Because of its excellent properties, PEDOT-PSS is widely used in various light emitting devices, such as quantum dot light emitting diodes (QLEDs) having quantum dots as light emitting layers. However, intrinsic PEDOT-PSS has a low conductivity, usually less than 1S/cm, which limits the performance of light emitting devices made therefrom.
Disclosure of Invention
The invention mainly aims to provide a method for processing PEDOT-PSS, a quantum dot light-emitting diode and a display device, and aims to provide a method for improving the conductivity of the PEDOT-PSS.
To achieve the above object, the present invention provides a method for processing PEDOT-PSS, comprising the steps of:
PEDOT-PSS materials are treated with a salt solution containing cations having a positive softness parameter to phase separate the PEDOT from the PSS.
Optionally, the salt solution comprises at least one of the following cations: ag + 、Au + 、Tl + 、Cu 2+ 、Zn 2+ 、Cd 2 + 、Hg 2+ 、Sn 2+ 、Pb 2+ 、Pd 2+ 、Pt 2+ 、Mn 3+ 、Fe 3+ 、Co 3+ 、Ga 3+ 、In 3+ 、Tl 3+ 、Sb 3+ 、Bi 3+ 。
Optionally, the salt solution is HgCl 2 Solution, TlCl 3 Solution, SbCl 3 Solution and InCl 3 One or more of the solutions.
Optionally, the step of treating the PEDOT-PSS material with a salt solution comprises: and obtaining a PEDOT-PSS solution, and mixing a salt solution with the PEDOT-PSS solution to obtain a high-conductivity mixed solution.
Optionally, the concentration of the salt solution is 0.1mol/L to 1mol/L, and the volume ratio of the salt solution to the high-conductivity mixed solution is (1 to 30): 100.
optionally, the step of treating the PEDOT-PSS material with a salt solution comprises: and (3) obtaining a PEDOT-PSS film, dropwise adding a salt solution to the surface of the PEDOT-PSS film, uniformly coating, heating and drying to obtain the high-conductivity film.
Optionally, the heating temperature is 110-200 ℃; and/or the presence of a gas in the gas,
the concentration of the salt solution is 0.1 mol/L-1 mol/L.
Optionally, the concentration of the salt solution is 0.6mol/L to 1 mol/L.
In addition, the invention also provides a quantum dot light-emitting diode which comprises the PEDOT-PSS obtained by the processing method of the PEDOT-PSS.
In addition, the invention also provides a display device which comprises the quantum dot light-emitting diode.
The conductive material provided by the invention is prepared by treating PEDOT-PSS (polyethylene glycol terephthalate-PSS) by using salt solution containing specific cations (cations with positive softness parameters) so that the cations can replace PEDOT + And PSS - Binding of anions contained in the salt solution to PEDOT + And the PEDOT and the PSS are combined to separate the structure of the PEDOT and the PSS from a tightly-surrounded coil shape to a looser state, so that the conductivity of the PEDOT-PSS is obviously improved, and meanwhile, the flexibility, the light transmittance and the work function of the PEDOT-PSS are not obviously changed because the structure of the PEDOT-PSS is not damaged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram showing the structural changes of PEDOT-PSS before and after being treated by the method for treating PEDOT-PSS according to the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention provides a method for processing PEDOT-PSS, which is used for processing the PEDOT-PSS, so that the conductivity of the PEDOT-PSS is obviously improved, and the flexibility, the light transmittance and the work function are not influenced. FIG. 1 is a schematic diagram showing the structural changes of PEDOT-PSS before and after being processed by the method for processing PEDOT-PSS according to the present invention, wherein: 1 is the structure of PEDOT-PSS before processing; 2 is the structure of PEDOT-PSS processed by the method for processing PEDOT-PSS provided by the invention; wherein the thin lines indicate long PSS chains and the thick lines indicate short PEDOT chains.
The method for processing PEDOT-PSS comprises the following steps:
step S10, the PEDOT-PSS material is treated with a salt solution to phase separate the PEDOT from the PSS, wherein the salt solution contains cations with a positive softness parameter.
In this example, the PEDOT-PSS material was treated with a saline solution containing cations with positive softness parameters. The softness parameter represents the strong and weak binding energy of cations and anions, the positive softness parameter represents the strong binding energy, the more positive value, the stronger binding energy, when the PEDOT-PSS is treated by using the saline solution containing the cations with the positive softness parameter, the schematic diagram of the structure change of the PEDOT-PSS before and after the saline solution treatment shown in figure 1 is combined, and the cations replace the PEDOT + And PSS - Binding while substituting the PSS by the anion contained in the salt solution - And PEDOT + The bonding results in the separation of PEDOT from PSS, which loosens the original tightly wound coil structure, thus leading to a significant increase in the electrical conductivity of PEDOT-PSS, and the flexibility, optical transparency and work function of PEDOT-PSS have not been significantly changed since the structure of PEDOT-PSS has not been destroyed.
Due to Ag + 、Au + 、Tl + 、Cu 2+ 、Zn 2+ 、Cd 2+ 、Hg 2+ 、Sn 2+ 、Pb 2+ 、Pd 2+ 、Pt 2+ 、Mn 3+ 、Fe 3+ 、Co 3+ 、Ga 3+ 、In 3+ 、Tl 3+ 、Sb 3+ And Bi 3+ Softness parameters all having a large positive value, and PSS - The binding energy is strong, therefore, in this embodiment, the salt solution preferably contains at least one of the following cationsSalt solution of seed: ag + 、Au + 、Tl + 、Cu 2+ 、Zn 2+ 、Cd 2+ 、Hg 2+ 、Sn 2 + 、Pb 2+ 、Pd 2+ 、Pt 2+ 、Mn 3+ 、Fe 3+ 、Co 3+ 、Ga 3+ 、In 3+ 、Tl 3+ 、Sb 3+ 、Bi 3+ . That is, the salt solution may include any one of the above-listed cations, and may also include any two or more of the above-mentioned cations. It is to be understood that the ions contained in the salt solution include, but are not limited to, the cations listed above, and may also include any other anion, such as, for example, Cl - ，NO 3 - And the like. The anion is soluble in water when combined with any other cation in the salt solution.
Whereas anions and cations are associated with PEDOT, respectively + 、PSS - The strength of the binding energy directly affects the phase separation of PEDOT and PSS, and further affects the conductivity increase, and in view of the above situation and the toxicity of the ions themselves, in an embodiment of the present invention, the salt solution is preferably HgCl 2 Solution, TlCl 3 Solution, SbCl 3 Solution and InCl 3 One or more of the solutions.
In this embodiment, the method for processing PEDOT-PSS provided by the present invention is not limited to the existence form of the PEDOT-PSS material, and the existence form of the PEDOT-PSS material may be a PEDOT-PSS solution, or a PEDOT-PSS film made of the PEDOT-PSS solution, that is, the PEDOT-PSS solution may be processed by using a salt solution, or the PEDOT-PSS film may be processed by using a salt solution. The following steps S100 and S200 will be described separately. It should be noted that, step S100 and step S200 are two preferred embodiments of the method for processing PEDOT-PSS according to the present invention, and there is no order between them.
And S100, processing the PEDOT-PSS solution by adopting a salt solution.
In this embodiment, the step of processing the PEDOT-PSS material with the salt solution includes processing the PEDOT-PSS material with the salt solution, and the specific operation may be performed through the following steps:
and S110, obtaining a PEDOT-PSS solution, and mixing a salt solution with the PEDOT-PSS solution to obtain a high-conductivity mixed solution.
In this embodiment, the concentration of the salt solution is 0.1mol/L to 1mol/L, and the volume ratio of the salt solution to the highly conductive mixed solution is (1 to 30): 100. when the salt solution is mixed with the PEDOT-PSS solution, the anions and cations in the salt solution are respectively mixed with the PEDOT + 、PSS - Binding, high conductivity of anions, cations, PEDOT in the mixed solution + And PSS - The content of (A) will directly influence the anion and PEDOT + Cation and PSS - The combination condition of (2) and further influences the conductivity increase range of the high conductivity mixed liquid. Proved by verification, the concentration of the salt solution is 0.1-1 mol/L, and the volume ratio of the salt solution to the high-conductivity mixed solution is (1-30): at 100 f, the conductivity improvement effect is optimal.
Simultaneously, anion, cation, PEDOT + And PSS - In the solution state, the dissociation degree is higher, the contact area is larger, and the inter-ionic bonding is easier, so in the embodiment, the PEDOT-PSS solution is directly processed by mixing the two solutions.
Further, based on the step S110, in this embodiment, after the step S110, the following steps may be further included:
and step S120, dripping the high-conductivity mixed liquid on a substrate, spin-coating, and heating and drying to obtain the PEDOT-PSS high-conductivity film.
After being processed by the saline solution, the PEDOT-PSS solution needs to be made into a film and then used for preparing a light-emitting device, so that the application value of the PEDOT-PSS solution is realized. In this embodiment, the substrate is a flexible substrate, including but not limited to polyethylene terephthalate (PET), Polyimide (PI), and the like; the heating and drying temperature is 110-200 ℃, and the time is 30 min.
Specifically, the high-conductivity mixed solution is filtered by a filter with the aperture of 0.45um, and filtrate is taken; and (3) dripping the filter liquid on a pre-cleaned dry substrate, performing spin coating, and then baking for 30min at the temperature of 110-200 ℃ to obtain the PEDOT-PSS high-conductivity film.
And S200, processing the PEDOT-PSS film by adopting a salt solution.
In this embodiment, the step of processing the PEDOT-PSS material with the salt solution includes processing the PEDOT-PSS film with the salt solution, and the specific operations may be performed by the following steps:
and S210, obtaining a PEDOT-PSS film, dripping a salt solution on the PEDOT-PSS film, uniformly coating, heating and drying to obtain the high-conductivity film.
The PEDOT-PSS film is directly treated by the salt solution, so that the method is also applicable to the prepared PEDOT-PSS film, the application range of the method is widened, and the condition of scrapping the prepared PEDOT-PSS film is avoided.
In the embodiment, the heating temperature is 110-200 ℃, and under the heating condition, the salt solution can permeate into the PEDOT-PSS film, so that the PEDOT and the PSS are separated. In specific implementation, the method can be realized by the following steps: depositing a PEDOT-PSS solution on a pre-cleaned dry substrate by using a solution method, and baking the PEDOT-PSS solution for 30min at the temperature of 110-200 ℃ to form a PEDOT-PSS film; and then, dripping a salt solution on the surface of the PEDOT-PSS film at the temperature of 110-200 ℃ and uniformly coating the PEDOT-PSS film until the surface of the PEDOT-PSS film is dried to obtain the high-conductivity film. In this embodiment, the substrate is a flexible substrate, and includes but is not limited to polyethylene terephthalate (PET), Polyimide (PI), and the like.
In addition, in this embodiment, when the PEDOT-PSS film is treated with the salt solution, the concentration of the salt solution may be 0.1mol/L to 1mol/L, and preferably 0.6mol/L to 1 mol/L. Generally, in the concentration range of 0.1mol/L to 1mol/L, the conductivity of the PEDOT-PSS film treated by the salt solution increases along with the increase of the salt concentration, and particularly, when the concentration of the salt solution is 0.1mol/L to 0.6mol/L, the conductivity of the PEDOT-PSS film shows a sharp increase trend; when the concentration of the salt solution is 0.6mol/L to 1.0mol/L, the increase of the conductivity of the PEDOT-PSS film begins to tend to be slow, and when the concentration is 1.0mol/L, the increase of the conductivity of the PEDOT-PSS film is nearly saturated.
In addition, the invention also provides a quantum dot light-emitting diode which comprises the PEDOT-PSS obtained by the processing method of the PEDOT-PSS.
In this embodiment, a quantum dot light emitting diode (QLED) includes a substrate including a bottom electrode, a hole injection layer, a hole transport layer, a quantum dot light emitting layer, an electron transport layer, and a top electrode in this order, where PEDOT-PSS obtained by processing according to the method of the present invention is used as an electrode material. Because the PEDOT-PSS obtained by the processing method of the PEDOT-PSS has good conductivity, flexibility, light transmittance and work function, the quantum dot light-emitting diode made of the PEDOT-PSS has good luminous efficiency.
At a molar ratio of 1.0mol/LTlCl 3 The solution, the PET substrate and the PEDOT-PSS film are taken as examples, and the quantum dot light-emitting diode can be prepared by the following steps:
s1, taking the PET substrate, ultrasonically cleaning the PET substrate by using a washing liquid, deionized water, ethanol and isopropanol in sequence, and then drying the PET substrate in an oven at 80 ℃ for later use;
step S2, taking the PET substrate for later use, and carrying out ultraviolet-ozone treatment for 15 min;
s3, depositing a PEDOT-PSS solution on the PET substrate treated by the ultraviolet-ozone by using a solution method, and then annealing for 30min at 150 ℃;
Step S4, continuing to drip TlCl on the surface of the deposited PEDOT PSS film at 150 DEG C 3 The solution is evaporated and dried;
step S5, after the PET substrate is cooled to room temperature, the surface of the PET substrate is cleaned by deionized water and baked for 30min at 150 ℃ to obtain a substrate containing a bottom electrode;
step S6, depositing PEDOT-PSS as a hole injection layer on the substrate comprising the bottom electrode by a solution method, wherein the thickness of the hole injection layer is 30 nm;
step S7, depositing TFB on the hole injection layer by a solution method to form a hole transport layer, wherein the thickness of the hole transport layer is 30 nm;
s8, depositing CdSe/CdS quantum dots on the hole transport layer by a solution method to form a luminescent layer, wherein the thickness of the luminescent layer of the quantum dots is 25 nm;
s9, depositing ZnO on the quantum dot light-emitting layer by a solution method to form an electron transport layer, wherein the electron transport layer is 30nm thick;
and step S10, depositing Ag on the electron transport layer by using an evaporation method to be used as a top electrode, wherein the thickness of the top electrode is 100 nm.
In addition, the invention also provides a display device which can be a display screen, a computer or a television and the like, wherein the display device comprises the quantum dot light-emitting diode.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Comparative example
A PEDOT-PSS film prepared from the PEDOT-PSS solution is detected by taking a commercial PEDOT-PSS solution as a comparative example, and the PEDOT-PSS film has the advantages of electric conductivity of 0.16S/cm, light transmittance at 300nm of 82%, work function of 5.02eV and good flexibility.
Meanwhile, the commercial PEDOT-PSS solution is used as the PEDOT-PSS material to be processed in the embodiments 1-4; PEDOT-PSS films prepared from the commercial PEDOT-PSS solution were used as the PEDOT-PSS materials to be processed in examples 5-8.
Example 1
0.1mol/LHgCl 2 Mixing 1ml of the solution with 99ml of PEDOT-PSS solution to obtain high-conductivity mixed solution; filtering the high-conductivity mixed solution by using a filter with the aperture of 0.45um, and taking a filtrate; and (3) dripping the filter liquid on a pre-cleaned dry PET substrate, performing spin coating, and then baking at the temperature of 150 ℃ for 30min to obtain the PEDOT-PSS high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 612.87S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is measured by an ultraviolet spectrophotometer to be 80%, and compared with a comparative example, the light transmittance is not obviously changed;
When measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film was 5.06eV, and the film showed no significant change compared with the comparative example.
Example 2
1mol/LSbCl 3 Mixing 30ml of the solution with 70ml of PEDOT-PSS solution to obtain high-conductivity mixed solution; filtering the high-conductivity mixed solution by using a filter with the aperture of 0.45um, and taking a filtrate; and (3) dripping the filter liquid on a pre-cleaned dry PET substrate, performing spin coating, and then baking at the temperature of 150 ℃ for 30min to obtain the PEDOT-PSS high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 609.12S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 79 percent measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film is 5.01eV, and compared with the comparative example, the film has no obvious change.
Example 3
0.6mol/LInCl 3 Mixing 15ml of the solution with 85ml of PEDOT-PSS solution to obtain high-conductivity mixed solution; filtering the high-conductivity mixed solution by using a filter with the aperture of 0.45um, and taking a filtrate; and (3) dripping the filter liquid on a pre-cleaned dry PET substrate, performing spin coating, and then baking for 30min at the temperature of 110-200 ℃ to obtain the PEDOT-PSS high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 597.26S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 81 percent measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film is 5.01eV, and compared with the comparative example, the film has no obvious change.
Example 4
0.8mol/L salt solution (HgCl) 2 Solution and TlCl 3 Mixed solution of the solution) 20ml and PEDOT-PSS solution 80ml are mixed to obtain high conductivity mixed solution; filtering the high-conductivity mixed solution by using a filter with the aperture of 0.45um, and taking a filtrate; and (3) dripping the filter liquid on a pre-cleaned dry PET substrate, performing spin coating, and then baking for 30min at the temperature of 110-200 ℃ to obtain the PEDOT-PSS high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 623.07S/cm, compared with a comparative example, the conductivity is remarkably increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is remarkably improved;
The light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 83% measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film was 5.02eV, and the film showed no significant change compared with the comparative example.
Example 5
Depositing a PEDOT-PSS solution on a pre-cleaned dry PET substrate by using a solution method, and baking at 110 ℃ for 30min to form a PEDOT-PSS film; then, 0.1mol/LHgCl is dripped on the surface of the PEDOT-PSS film at the temperature of 110 DEG C 2 The solution is evenly coated until the surface of the film is dried, thus obtaining the high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 596.22S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 81 percent measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film is 5.01eV, and compared with the comparative example, the film has no obvious change.
Example 6
Depositing a PEDOT-PSS solution on a pre-cleaned dry PET substrate by using a solution method, and baking for 30min at 200 ℃ to form a PEDOT-PSS film; then, 1mol/LInCl was dropped on the surface of the PEDOT-PSS film at 200 deg.C 3 The solution is evenly coated until the surface of the film is dried, and the high-conductivity film is obtained.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 614.08S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 82% measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function was 5.03eV, which was not significantly changed from that of the comparative example.
Example 7
Depositing a PEDOT-PSS solution on a pre-cleaned dry PET substrate by using a solution method, and baking at 150 ℃ for 30min to form a PEDOT-PSS film; then, 0.6mol/LTlCl was dropped on the surface of the PEDOT-PSS film at 150 ℃ 3 The solution is evenly coated until the surface of the film is dried, thus obtaining the high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 597.26S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
the light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 81 percent measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function of the film is 5.01eV, and compared with the comparative example, the film has no obvious change.
Example 8
Depositing a PEDOT-PSS solution on a pre-cleaned dry PET substrate by using a solution method, and baking at 130 ℃ for 30min to form a PEDOT-PSS film; then, 0.9mol/L salt solution (SbCl) was dropped onto the surface of the PEDOT-PSS film at 130 deg.C 3 Solution and TlCl 3 Mixed solution of the solution) and evenly coated until the surface of the film is dried, thus obtaining the high-conductivity film.
And (3) performance detection:
the conductivity of the PEDOT-PSS high-conductivity film measured by a four-probe measuring instrument is 609.57S/cm, compared with a comparative example, the conductivity is obviously increased, and the conductivity of the PEDOT-PSS processed by the method provided by the invention is obviously improved;
The light transmittance of the PEDOT-PSS high-conductivity film at 300nm is 81 percent measured by an ultraviolet spectrophotometer, and compared with a comparative example, the light transmittance is not obviously changed;
when measured by photoemission spectroscopy (PES) on the PEDOT-PSS high-conductivity film, the work function was 5.04eV, which was not significantly changed from that of the comparative example.
Examples 9 to 23
Examples 9 to 16 except for SbCl 3 The procedure is as in example 2 except that the solution is changed to a salt solution corresponding to each example in the following table;
examples 16 to 23 preparation of TlCl 3 The procedure was as in example 7 except that the solution was changed to the salt solution corresponding to each example in the following table.
TABLE 1 cationic species in salt solutions used in the examples
Cations contained in salt solutions Cations contained in salt solutions
Example 9 Cu 2+ Example 17 Ga 3+
Example 10 Bi 3+ Example 18 Pd 2+
Example 11 Fe 3+ Example 19 Tl +
Example 12 Ga 3+ Example 20 Co 3+
Example 13 Sb 3+ 、Bi 3+ Example 21 Pb 2+
Example 14 Ag + Example 22 Zn 2+ 、Cd 2+
Example 15 Pt 2+ 、Mn 3+ Example 23 Au + 、Hg 2+
Example 16 Sn 2+ Example 24 Bi 3+ 、Sn 2+ 、Pd 2+
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims (9)

1. A method of processing PEDOT-PSS, comprising the steps of:
treating a PEDOT-PSS material with a salt solution to phase separate the PEDOT from the PSS, wherein the salt solution comprises cations having a positive softness parameter;
the salt solution comprises at least one of the following cations: ag + 、Au + 、Tl + 、Cu 2+ 、Zn 2+ 、Cd 2+ 、Hg 2+ 、Sn 2+ 、Pb 2+ 、Pd 2+ 、Pt 2+ 、Mn 3+ 、Fe 3+ 、Co 3+ 、Ga 3+ 、In 3+ 、Tl 3+ 、Sb 3+ 、Bi 3+ ；
The salt solution comprises at least one of the following anions: cl - ，NO 3 - 。
2. The method of processing PEDOT-PSS according to claim 1, wherein the salt solution is HgCl 2 Solution, TlCl 3 Solution, SbCl 3 Solution and InCl 3 One or more of the solutions.
3. The method of processing PEDOT-PSS according to claim 1 wherein the step of processing PEDOT-PSS material with salt solution comprises:
and obtaining a PEDOT-PSS solution, and mixing a salt solution with the PEDOT-PSS solution to obtain a high-conductivity mixed solution.
4. The method of PEDOT-PSS treatment according to claim 3, wherein the concentration of said salt solution is between 0.1mol/L and 1mol/L, the volume ratio of said salt solution to said highly conductive mixed solution is (1-30): 100.
5. the method of processing PEDOT-PSS according to claim 1 wherein the step of processing PEDOT-PSS material with salt solution comprises: and (3) obtaining a PEDOT-PSS film, dropwise adding a salt solution to the surface of the PEDOT-PSS film, uniformly coating, heating and drying to obtain the high-conductivity film.
6. The method of processing PEDOT-PSS according to claim 5,
the heating temperature is 110-200 ℃; and/or the presence of a gas in the gas,
the concentration of the salt solution is 0.1 mol/L-1 mol/L.
7. The method of processing PEDOT-PSS according to claim 6 wherein the concentration of said salt solution is between 0.6mol/L and 1 mol/L.
8. A quantum dot light emitting diode comprising PEDOT-PSS obtained by the method for processing PEDOT-PSS according to any one of claims 1 to 7.
9. A display device, characterized in that the display device comprises a quantum dot light emitting diode according to claim 8.
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CN106297968A (en) * 2016-08-26 2017-01-04 中国科学院上海硅酸盐研究所 A kind of PEDOT thin film of high thickness high conductivity and preparation method thereof
CN107046107A (en) * 2016-12-13 2017-08-15 Tcl集团股份有限公司 Handle PEDOT:PSS method, QLED and preparation method

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CN106297968A (en) * 2016-08-26 2017-01-04 中国科学院上海硅酸盐研究所 A kind of PEDOT thin film of high thickness high conductivity and preparation method thereof
CN107046107A (en) * 2016-12-13 2017-08-15 Tcl集团股份有限公司 Handle PEDOT:PSS method, QLED and preparation method

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