Manufacture method of quantum dots printing ink and quantum dots printing ink manufactured with the manufacture method

Abstract

Disclosed are a manufacture method of quantum dots printing ink and manufactured quantum dots printing ink manufactured with the manufacture method. In the manufacture method, by mixing the first solvent and the second solvent, the viscosity of the quantum dots printing ink is adjusted to be in a predetermined range. Then, by mixing the third solvent with the first and second solvent, the surface tension thereof is adjusted to be in a predetermined range while maintaining the viscosity to be in the predetermined range. Furthermore, by adding the fourth solvent in the quantum dots printing ink, the vapor pressure is adjusted to be in a reasonable range. With mixture of kinds of solvents, the quantum dots printing ink of which the performance indicators, the viscosity, the surface tension, the dry condition are suitable for jet ink printing can be formulated to avoid adding the surfactant in the ink.

Claims

1. A manufacture method of quantum dots printing ink, comprising steps of: step 1, providing quantum dots material and first solvent, and mixing the quantum dots material and the first solvent, together in uniform dispersion to obtain first mixed solution; step 2, providing second solvent, which is mutually dissolvable with the first solvent, and adding the second solvent in the first mixed solution according to a volume ratio that the first solvent and the second solvent is 1:2-2:1 in uniform mixture to obtain a second mixed solution, of which a viscosity is 1-10 cps; step 3, providing third solvent, which is mutually dissolvable with the first solvent and the second solvent, and adding the third solvent in the second mixed solution according to a volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 1:2-2:1 in uniform mixture to obtain the quantum dots printing ink, of which a viscosity is 1-10 cps, and a surface tension is 30-40 dyne/cm; and step 4, providing fourth solvent, which is mutually dissolvable with the first solvent, the second solvent and the third solvent, and adding the fourth solvent in the quantum dots printing ink according to a volume ratio that the fourth solvent and a sum of the first solvent, the second solvent and the third solvent is smaller than 1/9 in uniform mixture, so as to adjust a room temperature vapor pressure of the quantum dots printing ink under 100 mmHg as maintaining the viscosity of the quantum dots printing ink to be 1 -10 cps, and the surface tension to be 30-40 dyne/cm; wherein the first solvent is monoethylene glycol; the second solvent is 1-butanol; the third solvent is pyrrolidinone; the fourth solvent is propylene glycol propyl ether.

2. The manufacture method of the quantum dots printing ink according to claim 1, wherein both the viscosities of the first solvent and the second solvent cannot be less than 1 cps, and cannot be larger than 10 cps.

3. The manufacture method of the quantum dots printing ink according to claim 1, wherein in the quantum dots printing ink, a mass percentage of the quantum dots material is 0.1 wt %-10 wt %.

4. Quantum dots printing ink, comprising quantum dots material and first solvent, second solvent and third solvent, which are dissolvable with one another, and a volume ratio of the first solvent and the second solvent is 1:2-2:1, and a volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 1:2-2:1, and a viscosity of the quantum dots printing ink is 1-10 cps, and a surface tension is 30-40 dyne/cm; and further comprising fourth solvent, which is mutually dissolvable with the first solvent, the second solvent and the third solvent, and a volume ratio that the fourth solvent and a sum of the first solvent, the second solvent and the third solvent is smaller than 1/9 to make a room temperature vapor pressure of the quantum dots printing ink under 100 mmHg; wherein the first solvent is monoethylene glycol; the second solvent is 1-butanol; the third solvent is pyrrolidinone; the fourth solvent is propylene glycol propyl ether.

5. The quantum dots printing ink according to claim 4, wherein both the viscosities of the first solvent and the second solvent cannot be less than 1 cps, and cannot be larger than 10 cps.

6. The quantum dots printing ink according to claim 4, wherein a mass percentage of the quantum dots material is 0.1 wt %-10 wt %.

7. Quantum dots printing ink, comprising quantum dots material and first solvent, second solvent and third solvent, which are dissolvable with one another, and a volume ratio of the first solvent and the second solvent is 1:2-2:1, and a volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 1:2-2:1, and a viscosity of the quantum dots printing ink is 1-10 cps, and a surface tension is 30-40 dyne/cm; wherein both the viscosities of the first solvent and the second solvent cannot be less than 1 cps, and cannot be larger than 10 cps; wherein a mass percentage of the quantum dots material is 0.1 wt %-10 wt %; wherein the quantum dots printing ink further comprises fourth solvent, which is mutually dissolvable with the first solvent, the second solvent and the third solvent, and a volume ratio that the fourth solvent and a sum of the first solvent, the second solvent and the third solvent is smaller than 1/9 to make a room temperature vapor pressure of the quantum dots printing ink under 100 mmHg; and wherein the first solvent is monoethylene glycol; the second solvent is 1-butanol; the third solvent is pyrrolidinone; the fourth solvent is propylene glycol propyl ether.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to better understand the characteristics and technical aspect of the invention, please refer to the following detailed description of the present invention is concerned with the diagrams, however, provide reference to the accompanying drawings and description only and is not intended to be limiting of the invention.

(2) In drawings,

(3) FIG. 1 is a flowchart of a manufacture method of quantum dots printing ink according to the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(4) For better explaining the technical solution and the effect of the present invention, the present invention will be further described in detail with the specific embodiments.

(5) Please refer to FIG. 1. The present invention provides a manufacture method of quantum dots printing ink, comprising steps of:

(6) step 1, providing quantum dots material and first solvent, and mixing the quantum dots material and the first solvent, together in uniform dispersion to obtain first mixed solution.

(7) Specifically, the quantum dots material can be nanocrystals of II-VI elements, III-V elements, IV elements, or other compounds.

(8) Furthermore, the quantum dots material can be hole injecting layer (HIL) material, hole transporting layer (HTL) material, emission layer (EML) material or electron transporting layer (ETL) material.

(9) Specifically, in the step 1, the quantum dots material is uniformly dispersed in the first solvent by stirring with ultrasonic wave oscillation to obtain first mixed solution.

(10) step 2, providing second solvent, which is mutually dissolvable with the first solvent, and adding the second solvent in the first mixed solution according to a volume ratio that the first solvent and the second solvent is 1:2-2:1 in uniform mixture to obtain a second mixed solution, of which a viscosity is 1-10 cps.

(11) Specifically, both the viscosities of the first solvent and the second solvent cannot be less than 1 cps, and cannot be larger than 10 cps. The viscosity of the second mixed solution is adjusted to be 1-10 cps by adjusting the volume ratio of the first solvent and the second solvent.

(12) Preferably, the volume ratio of the first solvent and the second solvent is 2:1, 1:1 or 1:2.

(13) Specifically, in the step 2, the second solvent is uniformly mixed with the first mixed solution by stirring to obtain the second mixed solution.

(14) step 3, providing third solvent, which is mutually dissolvable with the first solvent and the second solvent, and adding the third solvent in the second mixed solution according to a volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 1:2-2:1 in uniform mixture to obtain the quantum dots printing ink, of which a viscosity is 1-10 cps, and a surface tension is 30-40 dyne/cm.

(15) Preferably, the volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 2:1, 1:1 or 1:2.

(16) By adjusting the volume ratio of the third solvent and a mixture of the first solvent and the second solvent, the surface tension of the quantum dots printing ink is adjusted to be 30-40 dyne/cm as maintaining the viscosity of the quantum dots printing ink to be 1-10 cps.

(17) Specifically, in the step 3, the third solvent is uniformly mixed with the second mixed solution by stirring to obtain the quantum dots printing ink.

(18) Preferably, the manufacture method of quantum dots printing ink according to the present invention further comprises step 4: providing fourth solvent, which is mutually dissolvable with the first solvent, the second solvent and the third solvent, and adding the fourth solvent in the quantum dots printing ink according to a volume ratio that the fourth solvent and a sum of the first solvent, the second solvent and the third solvent is smaller than 1/9 in uniform mixture, and adjusting a room temperature vapor pressure of the quantum dots printing ink under 100 mmHg as maintaining the viscosity of the quantum dots printing ink to be 1-10 cps, and the surface tension to be 30-40 dyne/cm. It can prevent the evaporation of the quantum dots printing ink is too fast in the jet ink printing process, and the ink drop can gather to form a film, and ultimately a thin film of uniform thickness is formed.

(19) Specifically, the fourth solvent can be propylene glycol propyl ether.

(20) Specifically, in the step 4, the fourth solvent and the quantum dots printing ink are uniformly mixed by stirring.

(21) Specifically, in the manufactured quantum dots printing ink of the present invention, a mass percentage of the quantum dots material is 0.1 wt %-10 wt %.

(22) Preferably, the first solvent is monoethylene glycol; the second solvent is 1-butanol; the third solvent is pyrrolidinone.

(23) In the aforesaid manufacture method of quantum dots printing ink, by mixing the first solvent and the second solvent, the viscosity of the quantum dots printing ink is adjusted to be in a predetermined range. Then, by mixing the third solvent with the first solvent and the second solvent, the surface tension of the quantum dots printing ink is adjusted to be in a predetermined range while maintaining the viscosity of the quantum dots printing ink to be in the predetermined range. Furthermore, by adding the fourth solvent in the quantum dots printing ink, the vapor pressure thereof is adjusted to be in a reasonable range. With mixture of kinds of solvents, the quantum dots printing ink of which the performance indicators, such as the viscosity, the surface tension, the dry condition are suitable for jet ink printing can be formulated to avoid adding the surfactant in the ink. The influence to the conductivity and light emitting performance of the thin film can be prevented with that the thin film, which is obtained by jet ink printing the ink, does not include the surfactant.

(24) On the basis of the aforesaid manufacture method, the present invention further provides quantum dots printing ink, comprising quantum dots material and first solvent, second solvent and third solvent, which are dissolvable with one another, and a volume ratio of the first solvent and the second solvent is 1:2-2:1, and a volume ratio that a sum of the first solvent and the second solvent, and the third solvent is 1:2-2:1, and a viscosity of the quantum dots printing ink is 1-10 cps, and a surface tension is 30-40 dyne/cm.

(25) Furthermore, the quantum dots printing ink further comprises fourth solvent, which is mutually dissolvable with the first solvent, the second solvent and the third solvent, and a volume ratio that the fourth solvent and a sum of the first solvent, the second solvent and the third solvent is smaller than 1/9 to make a room temperature vapor pressure of the quantum dots printing ink under 100 mmHg. It can prevent the evaporation of the quantum dots printing ink is too fast in the jet ink printing process, and the ink drop can gather to form a film, and ultimately a thin film of uniform thickness is formed.

(26) Specifically, the fourth solvent can be propylene glycol propyl ether.

(27) Specifically, both the viscosities of the first solvent and the second solvent cannot be less than 1 cps, and cannot be larger than 10 cps. Preferably, the first solvent is monoethylene glycol; the second solvent is 1-butanol; the third solvent is pyrrolidinone.

(28) Specifically, in the quantum dots printing ink, a mass percentage of the quantum dots material is 0.1 wt %-10 wt %.

(29) Specifically, the quantum dots material can be nanocrystals of II-VI elements, III-V elements, IV elements, or other compounds.

(30) Furthermore, the quantum dots material can be hole injecting layer (HIL) material, hole transporting layer (HTL) material, emission layer (EML) material or electron transporting layer (ETL) material.

(31) The aforesaid quantum dots printing ink, in which the solvent is a mixed solvent including kinds of solvents, is the quantum dots printing ink of which the performance indicators, such as the viscosity, the surface tension, the dry condition are suitable for jet ink printing. The quantum dots printing ink does not includes surfactant and possesses better conductivity and light emitting performance with that the thin film, which is obtained by jet ink printing the ink, does not include the surfactant.

(32) In conclusion, the present invention provides a manufacture method of quantum dots printing ink. By mixing the first solvent and the second solvent, the viscosity of the quantum dots printing ink is adjusted to be in a predetermined range. Then, by mixing the third solvent with the first solvent and the second solvent, the surface tension of the quantum dots printing ink is adjusted to be in a predetermined range while maintaining the viscosity of the quantum dots printing ink to be in the predetermined range. Furthermore, by adding the fourth solvent in the quantum dots printing ink, the vapor pressure thereof is adjusted to be in a reasonable range. With mixture of kinds of solvents, the quantum dots printing ink of which the performance indicators, such as the viscosity, the surface tension, the dry condition are suitable for jet ink printing can be formulated to avoid adding the surfactant in the ink. The influence to the conductivity and light emitting performance of the thin film can be prevented with that the thin film, which is obtained by jet ink printing the quantum dots printing ink, does not include the surfactant. The present invention provides quantum dots printing ink, including kinds of solvents, and is the quantum dots printing ink of which the performance indicators, such as the viscosity, the surface tension, the dry condition are suitable for jet ink printing. The quantum dots printing ink does not includes surfactant and possesses better conductivity and light emitting performance with that the thin film, which is obtained by jet ink printing the ink, does not include the surfactant.

(33) Above are only specific embodiments of the present invention, the scope of the present invention is not limited to this, and to any persons who are skilled in the art, change or replacement which is easily derived should be covered by the protected scope of the invention. Thus, the protected scope of the invention should go by the subject claims.