CN107975763A - A kind of quantum dot film with anti-blue light effect - Google Patents

Abstract

The invention relates to an optical film, in particular to a quantum dot film with anti-blue light effect. In order to solve the problem of poor anti-blue light stability of the existing quantum dot film during use, the present invention provides a quantum dot film with anti-blue light effect. The quantum dot film includes a quantum dot layer, an upper barrier layer is provided on the upper surface of the quantum dot layer, and a lower barrier layer is provided on the lower surface of the quantum dot layer, and the quantum dot layer includes quantum dots and an adhesive; the upper barrier layer The layer includes an anti-blue light material, and the anti-blue light material is selected from one or a combination of at least two of anti-blue light additives or anti-blue light particles. The quantum dot film has better anti-blue light stability, and solves the problem of excessive blue light caused by quantum dot failure in the quantum dot film.

Description

A quantum dot film with anti-blue light effect

technical field

The invention relates to an optical film, in particular to a quantum dot film with anti-blue light effect.

Background technique

With the development of the optoelectronic industry, display technologies represented by OLED screens and quantum dot displays are emerging. Compared with traditional display technology, OLED screen and quantum dot display have a series of advantages of high color gamut, high brightness and high efficiency. In particular, quantum dot films are widely used in large-scale displays, and their color gamut can reach more than 90%.

The quantum dot film is composed of two layers of barrier films with a quantum dot layer sandwiched between them. The quantum dot layer is mainly composed of green quantum dots, red quantum dots and resin. With blue LEDs, the quantum dot film can convert part of the blue light into red and green light to form a mixed white light. However, quantum dots are prone to failure in the air, although the barrier film can block most of the oxygen and water vapor in the air. However, as time goes by, the quantum dots in the quantum dot film fail, and the blue light conversion efficiency gradually decreases, which eventually leads to excessive blue light in the mixed light.

And blue light has been confirmed by research to be the most harmful visible light. Medical research also shows that the human eye is not sensitive to the vision and color discrimination of violet light and some blue light in the 380-450nm band. Eye damage is greater. Therefore, it is very meaningful to provide a quantum dot film with anti-blue light effect.

Contents of the invention

In order to solve the problem of poor anti-blue light stability of the existing quantum dot film during use, the present invention provides a quantum dot film with anti-blue light effect. The quantum dot film has better anti-blue light stability, and solves the problem of excessive blue light caused by quantum dot failure in the quantum dot film.

The technical scheme provided by the present invention is described in detail as follows:

The invention provides a quantum dot film, the quantum dot film includes a quantum dot layer, an upper barrier layer is provided on the upper surface of the quantum dot layer, and a lower barrier layer is provided on the lower surface of the quantum dot layer, and the quantum dot layer includes a quantum dot layer and an adhesive; the upper barrier layer includes an anti-blue light material, and the anti-blue light material is selected from one or a combination of at least two of anti-blue light additives or anti-blue light particles.

Further, the quantum dots are selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, CdZnS, CdZnSe, CdZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, Ag2S, CuS , Cu2S, CuInS2, AgInS2, Ag2Se, CuSe, Cu2Se, CuInSe2, AgInSe2, Ag2Te, CuTe, Cu2Te, CuInTe2, AgInTe2, GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InAs, InSb, GaNP, GaNAs , InNP, InNAs, InNSb, InPAs, GaAlNP, GaAlNAs, SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, SnPbSTe or C One or a combination of at least two kinds of quantum dots; or a core-shell cladding structure or a doped structure of the aforementioned quantum dot materials.

Further, the size of the quantum dots is 1-500nm, preferably 2-50nm.

The upper barrier layer includes a bonding resin and an anti-blue light material, and the anti-blue light material is distributed in the bonding resin.

The barrier film has water vapor and oxygen barrier functions. The upper barrier layer or the lower barrier layer can be selected from a barrier film.

The bonding resin in the barrier layer can be selected from ethylene/vinyl alcohol copolymer and nylon materials. The barrier layer may be selected from PVA coated high barrier films.

Further, the quantum dots include red light quantum dots and green light quantum dots.

Further, the quantum dots include red light quantum dots and green light quantum dots, the size of the red light quantum dots is 6-9 nm, and the size of the green light quantum dots is 2-5 nm.

The red light quantum dots are also referred to as red quantum dots for short. The green light quantum dots are also referred to as green quantum dots for short.

The red light quantum dots refer to quantum dots that emit red light. The green light quantum dots refer to quantum dots that emit green light.

Further, in the quantum dot layer, the weight ratio of the red light quantum dots to the green light quantum dots is 1:1-1:15.

Further, in the quantum dot layer, the adhesive is selected from one or a mixture of at least two of polystyrene resin, polymethyl methacrylate, acrylic resin, polyurethane resin, and epoxy resin.

Further, the thickness of the quantum dot layer is 10-200 μm. Further, the thickness of the quantum dot layer is 75-200 μm.

The thickness of the upper barrier layer is 20-30 μm.

Further, the material of the quantum dot layer includes 1-10 parts by weight of red light quantum dots, 1-30 parts by weight of green light quantum dots, and 100 parts by weight of adhesive.

The upper barrier layer or the lower barrier layer can be selected from a barrier film. The barrier film is composed of one or several layers of films with water vapor and oxygen barrier capabilities, and the film materials include but are not limited to PVA coated high barrier films, polyvinylidene chloride films (PVDC), ethylene/vinyl alcohol copolymer Thin films (EOVH), nylon materials, inorganic oxide coating films, etc. The thickness of the barrier film is generally 10-100 μm. The barrier film can adopt the existing barrier film.

Further, in the quantum dot film, the anti-blue light additive is selected from one or both of azo, isoindolinone, quinophthalone, benzimidazolone yellow or green dyes. A combination of species; the anti-blue light particles are selected from one or a combination of tin oxide, titanium dioxide, cerium oxide, rubidium oxide, palladium oxide, platinum oxide, or chromium oxide.

Further, in the upper barrier layer, the weight of the anti-blue light material accounts for 0.01%-5% of the total weight of the upper barrier layer. The stated percentages are by weight.

Further, in the quantum dot film, the quantum dot layer includes 1-8 parts by weight of red light quantum dots and 5-20 parts by weight of green light quantum dots, and the weight ratio of the red light quantum dots to the green light quantum dots is 1:2.5-1:15.

Further, the adhesive in the quantum dot layer is selected from one or a mixture of at least two of polystyrene resin, polymethyl methacrylate, or polyurethane resin.

Further, the weight content of the anti-blue light additive or anti-blue light particles in the upper barrier layer is 0.01%-5%.

Further, the weight content of the anti-blue light additive or anti-blue light particles in the upper barrier layer is 1.5%-5%.

Further, the material and thickness of the lower barrier layer are the same as those of the upper barrier layer.

Further, the lower barrier layer does not add anti-blue light materials (anti-blue light additives or anti-blue light particles).

The present invention also provides the application of the above-mentioned quantum dot film, and the quantum dot film is applied to a backlight module.

Adding anti-blue light additives or anti-blue light particles to the upper barrier layer can effectively absorb excess blue light. No anti-blue light additives or anti-blue light particles are added to the lower barrier layer to ensure that blue light can pass through and convert into green in the quantum dot layer. light and red light. In this way, the quantum dot film with anti-blue light effect provided by the present invention has better anti-blue light stability, ensures high color gamut and high brightness, and can also prevent the problem of excessive blue light when the quantum dots fail. Moreover, the quantum dot film with anti-blue light effect provided by the present invention has better weather resistance and aging resistance.

Description of drawings

Fig. 1 is the structural representation of a kind of quantum dot film provided by the present invention;

Fig. 2 is a schematic diagram of the light conversion of the quantum dot film provided by the present invention.

Detailed ways

The technical solutions provided by the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

As shown in Figure 1, the present invention provides a quantum dot film, 101 is an upper barrier film added with anti-blue light additives or anti-blue light particles, 102 is a quantum dot layer, and the quantum dot layer includes quantum dots 1021 and adhesive 1022 , 103 is the lower barrier layer.

As shown in Figure 2, the schematic diagram of the light conversion of the quantum dot film provided by the present invention, 202 is the LED lamp bead that emits blue light, 201 is the quantum dot film provided by the present invention, the LED lamp emits blue light and passes through the lower barrier film, in the quantum dot The layer is converted, and most of the blue light is converted into green light and red light. When the mixed light passes through the upper barrier film, part of the blue light is absorbed, and the other part of blue light and green light is transmitted through the red light to form a mixed white light.

Quantum dot film provided by the invention adopts following method to test its performance:

Luminance test: Take an A4-sized quantum dot film, place it in the A4 backlight module, light it up at a rated voltage of 24V, and use a spectroscopic irradiance luminance meter (Konica Minolta Holdings Co., Ltd., model: CS2000 ) to measure its brightness.

Color gamut test: Take a 32-inch diaphragm and place it in a 32-inch monitor. After adjusting the monitor to the specified working state, input the red, green and blue signals of the whole field to the monitor, and use a light irradiation luminance meter (Konica Minolta Holdings Co., Ltd., model: CS2000) respectively test the chromaticity coordinates of the center point, and calculate the NTSC value through a fixed formula.

Blue light transmittance test: Take a 5-inch film to be tested and put it into a UV spectrophotometer to test the absorption of blue light with a wavelength of 380nm-450nm. The test result is the ratio of blue light transmission with a wavelength of 380nm-450nm, which is called the blue light transmittance. The lower the blue light transmittance, the more blue light it absorbs, and the better the anti-blue light effect.

High-temperature and high-humidity aging test: Put the finished diaphragm in a high-temperature and high-humidity box (Shanghai Linpin Instrument Co., Ltd. model: LRHS-010C-LJS), and age it at 65°C and 95% RH for 200 hours. Harsh conditions simulate accelerated aging of the diaphragm. From the difference between the test results of the performance before the high-temperature and high-humidity aging test and the performance after the test, it can be concluded that during the use of the quantum dot film provided by the present invention, when the quantum dots fail, whether there will be excessive blue light. Before and after the high-temperature and high-humidity aging experiment, the brightness decays, indicating that the quantum dots have failed, but the blue light absorption rate remains basically unchanged, indicating that the excess blue light is absorbed, and the blue light will not be excessive, indicating that the anti-blue light stability of the quantum dot film is good. . It shows that the quantum dot film provided by the present invention solves the problem of excessive blue light when the quantum dots fail during use.

In Examples 1-9, the size of the red light quantum dots is 6-9 nm, and the size of the green light quantum dots is 2-5 nm.

Example 1

The invention provides a quantum dot film with anti-blue light effect, which is made of 2 parts by weight of red light quantum dots CdSe, 12 parts by weight of green light quantum dots CdSe, and 100 parts by weight of polystyrene resin. The thickness of the layer is 100 μm, and the upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer. 2% of azo anti-blue light additives are added to the upper barrier. The upper and lower barrier films are all PVA-coated high-barrier films, and the thicknesses are respectively 20 μm.

Example 2

The invention provides a quantum dot film with an anti-blue light effect, which is made of 1 weight part of red light quantum dot CdS, 5 weight parts of green light quantum dot CdSe, and 100 weight parts of polymethyl methacrylate. The thickness of the quantum dot layer is 75 μm, and upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 1.5% of azo anti-blue light additives are added to the upper barrier, and the upper and lower barrier films are both ethylene/vinyl alcohol copolymer films ( EOVH) with a thickness of 25 μm, respectively.

Example 3

The invention provides a quantum dot film with an anti-blue light effect, which is made of 8 parts by weight of red light quantum dots CdSe, 20 parts by weight of green light quantum dots CdS, and 100 parts by weight of polymethyl methacrylate. The thickness of the quantum dot layer is 150 μm, and the upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 5% titanium dioxide is added in the upper barrier. The upper and lower barrier films are both ethylene/vinyl alcohol copolymer films (EOVH), and the thicknesses are respectively 30 μm.

Example 4

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 1 parts by weight of red light quantum dots ZnS, 15 parts by weight of green light quantum dots ZnS, and 100 parts by weight of polyurethane resin. The thickness of the formed quantum dot layer is 200 μm, and upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 3% isoindolinone anti-blue light additives are added to the upper barrier, and the upper and lower barrier films are nylon materials. The thickness was 23 μm, respectively.

Example 5

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 3 parts by weight of red light quantum dots CdSTe, 6 parts by weight of green light quantum dots CdSe, 100 parts by weight of epoxy resin, The thickness of the prepared quantum dot layer is 125 μm, and upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer. 1.5% rubidium oxide anti-blue light particles are added to the upper barrier. The upper and lower barrier films are all PVA coated high barrier films. The thickness is 25 μm, respectively.

Example 6

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 8 parts by weight of red light quantum dots CdZnSe, 8 parts by weight of green light quantum dots CdZnSe, 100 parts by weight of polymethacrylic acid Methyl ester, the thickness of the quantum dot layer made is 50 μm, the upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 2% of azo-type anti-blue light additives are added to the upper barrier, and the upper and lower barrier films are inorganic oxidation Thin coating films with a thickness of 28 μm, respectively.

Example 7

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 10 parts by weight of red light quantum dots CdSe, 30 parts by weight of green light quantum dots CdSe, and 100 parts by weight of polyurethane resin. The thickness of the formed quantum dot layer is 200 μm. The upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer. 5% quinophthalone anti-blue light additives are added to the upper barrier. The upper and lower barrier films are all PVA-coated high barrier films. Thin films, respectively, 20 μm in thickness.

Example 8

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 3 parts by weight of red light quantum dots ZnS, 5 parts by weight of green light quantum dots CdS, 100 parts by weight of epoxy resin, The thickness of the prepared quantum dot layer is 10 μm, and upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 0.01% of cerium oxide anti-blue light particles are added to the upper barrier, and the upper and lower barrier films are inorganic oxide coating films. The thickness was 24 μm, respectively.

Example 9

The quantum dot film with anti-blue light effect as provided in Example 1, wherein the quantum dot layer includes 1 part by weight of red light quantum dots CdSTe, 1 part by weight of green light quantum dots CdSTe, and 100 parts by weight of polymethacrylic acid Methyl ester, the thickness of the quantum dot layer made is 75 μm, the upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer, and 1% of benzimidazolone anti-blue light additives are added to the upper barrier, and the upper and lower barrier films are Nylon material with a thickness of 25 μm respectively.

Comparative example 1

A quantum dot film with an anti-blue light effect, selects 2 parts by weight of red light quantum dots, 12 parts by weight of green light quantum dots, and 100 parts by weight of polystyrene resin, and the thickness of the quantum dot layer made is 100 μm. The upper and lower barrier films are compounded on the upper and lower surfaces of the quantum dot layer. No anti-blue light additives are added to the upper barrier. The upper and lower barrier films are all PVA-coated high-barrier films with a thickness of 20 μm.

Table 1: Optical performance test comparison of quantum dot films obtained in Examples and Comparative Examples

From the experimental data in Table 1, it can be concluded that the quantum dot film with anti-blue light effect provided by the present invention has the characteristics of high brightness and high color gamut. At the same time, the addition of anti-blue light additives or particles can absorb excess blue light. Prevent blue light from harming human eyes. In particular, when the quantum dots in the quantum dot film gradually fail, the proportion of blue light in the backlight increases significantly. At this time, the absorption of blue light by the upper barrier layer is very meaningful. Among them, the comprehensive properties of the quantum dot films provided by Examples 1-4 of the present invention are better.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made according to the contents of the present invention are covered within the patent scope of the present invention.

Claims (10)

1. a quantum dot film, is characterized in that, described quantum dot film comprises quantum dot layer, is provided with upper barrier layer on quantum dot layer upper surface, and quantum dot layer lower surface is provided with lower barrier layer, and described quantum dot layer It includes quantum dots and an adhesive; the upper barrier layer includes an anti-blue light material, and the anti-blue light material is selected from one or a combination of anti-blue light additives or anti-blue light particles. 2. The quantum dot film according to claim 1, wherein the upper barrier layer comprises a bonding resin and an anti-blue light material, and the anti-blue light material is distributed in the bonding resin. 3. The quantum dot film according to claim 1, characterized in that no anti-blue light material is added to the lower barrier layer. 4. The quantum dot film according to claim 1, wherein the quantum dots include red light quantum dots and green light quantum dots, the particle size range of the red light quantum dots is 6-9nm, and the green light quantum dots The particle size range is 2-5nm. 5. The quantum dot film according to claim 4, wherein the weight ratio of the red light quantum dots to the green light quantum dots is 1:1-1:15. 6. quantum dot film according to claim 1, is characterized in that, the tackiness agent in described quantum dot layer is selected from polystyrene resin, polymethyl methacrylate, acrylic resin, polyurethane resin, epoxy resin one or a mixture of at least two. 7. quantum dot film according to claim 4, is characterized in that, the material of described quantum dot layer comprises the red light quantum dot of 1-10 weight part, the green light quantum dot of 1-30 weight part, the glue of 100 weight part adhesive. 8. The quantum dot film according to claim 1, wherein the anti-blue light auxiliary agent is selected from azos, isoindolinones, quinophthalones, benzimidazolones yellow or green dyes One or a combination of two; the anti-blue light particles are selected from one or a combination of tin oxide, titanium dioxide, cerium oxide, rubidium oxide, palladium oxide, platinum oxide, or chromium oxide. 9. The quantum dot film according to claim 1, characterized in that, the weight of the anti-blue light material accounts for 0.01%-5% of the total weight of the upper barrier layer, and the percentage is a percentage by weight. 10. An application of the quantum dot film according to any one of claims 1 to 9, characterized in that the quantum dot film is applied to a backlight module.