CN113823727A - Fluorescent powder film with high moisture-proof characteristic and application thereof - Google Patents
Fluorescent powder film with high moisture-proof characteristic and application thereof Download PDFInfo
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- CN113823727A CN113823727A CN202111104470.9A CN202111104470A CN113823727A CN 113823727 A CN113823727 A CN 113823727A CN 202111104470 A CN202111104470 A CN 202111104470A CN 113823727 A CN113823727 A CN 113823727A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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Abstract
The invention discloses a fluorescent powder film with high moisture resistance and application thereof, wherein the fluorescent powder film comprises a transparent film, a waterproof layer and a fluorescent powder layer, wherein the fluorescent powder layer is clamped between the transparent film and the waterproof layer, the fluorescent powder layer comprises fluorescent powder particles and an adhesive, the fluorescent powder layer of the prepared fluorescent powder film can also manufacture and realize the fluorescent powder film with longer service life even when perovskite fluorescent powder which is easy to hydrolyze is used, and when the fluorescent powder film is used, the design of a light guide plate cannot be greatly influenced, the moisture resistance is good, and a wide color gamut liquid crystal display device is realized.
Description
Technical Field
The invention belongs to the field of fluorescent powder, and particularly relates to a fluorescent powder film with high moisture resistance and application thereof.
Background
Currently, liquid crystal display devices for low-to-medium resolution color images are generally used as mobile phones and mobile display devices. The liquid crystal display device is a non-self-luminous display device which does not emit light, and therefore, an illumination and display device is required, and a white LED is generally used as a light source.
In particular, in a mobile phone, a double-sided visible liquid crystal display device can be used for displaying image information on both front and rear sides of a reflective liquid crystal display device. Devices using white LEDs are mainly used for liquid crystal elements used for lighting and display liquid crystal devices. In the white LED, a green phosphor or a yellow phosphor is generally dispersed in a resin and coated on a light emitting surface of a blue LED light source element. The green or yellow light obtained from the green phosphor or the yellow phosphor is mixed with the blue light of the blue LED element to obtain white light. In the white LED having such a configuration, the intensity of light irradiated to the phosphor is high, and the phosphor is formed by being coated at a predetermined formation density on the rear surface of the light guide plate in order to prevent thermal failure of the phosphor. In addition, a wavelength conversion member is superimposed between the blue LED element and the light guide plate incident surface by performing wavelength conversion using a phosphor having a small particle diameter.
The liquid crystal display device selects and displays a desired color from light emitted from the white LED by using color filters of red (R), green (G), and blue (B) provided on the liquid crystal panel and a switching function of the liquid crystal element. Therefore, by changing the intensity of the blue light or adjusting the concentration of the yellow phosphor particles, and further adjusting the ratio of the intensity of the blue light to the intensity of the yellow light, a luminescent color of any chromaticity can be obtained on a line connecting the blue light and the yellow light. In this case, strictly speaking, components other than yellow light are obtained by changing blue light. Therefore, the chromaticity can be represented by a straight line connecting the widths of the blue light and the yellow light. However, the line connecting the blue and yellow light is not wide enough, and the wide color gamut of the triangle achieved by only the blue and yellow phosphors is lacking.
In order to solve these problems, it is preferable that green phosphor particles that convert blue light into green light and red phosphor particles that convert blue light into red light are mixed in a specific ratio in a binder for use. As such phosphor particles, sulfide phosphor particles formed by combining a sulfur compound, a selenium compound, a tellurium compound, or the like doped with a rare earth element can be selected. The green phosphor particles excited by the blue light emit green light; red phosphor particles excited by the blue light emit red light. The emission intensity of green and red light depends on the wavelength conversion efficiency and the mixture concentration of the green phosphor particles and the red phosphor particles, and the intensity of emitted blue light. Therefore, by adjusting the mixing ratio and mixing concentration of the green phosphor particles and the red phosphor particles and changing the intensity of blue light, light corresponding to all colors within a triangle connecting the blue light, the green light, and the red light can be obtained. These triangles cover a large portion of the area encompassed by RGB and may increase the color gamut.
The white light is obtained according to the additive color mixing, the light is converted from the light source through the wavelength of the film coated by the existing fluorescent powder, and particularly, the so-called sulfide is obtained by combining a sulfur mixture, a selenium mixture, a tellurium mixture and the like which are doped with rare earth elements and have higher light conversion efficiency. However, the perovskite compound phosphor particles are easily deteriorated in characteristics after absorbing moisture in the environment. Therefore, it is difficult to maintain efficient color development for a long time by using perovskite compound phosphor particles in the prior art.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a phosphor film having high moisture resistance, which can make the life of the phosphor film longer even when perovskite phosphors which are easily hydrolyzed are used, and which can make a liquid crystal display device exhibit a wider color gamut using the phosphor film, and an application thereof.
In order to realize the purposes, the adopted technical scheme is as follows:
one of the objectives of the present invention is to provide a phosphor film with high moisture resistance, comprising a transparent film, a moisture-impermeable layer, and a phosphor layer, wherein the phosphor layer is sandwiched between the transparent film and the moisture-impermeable layer, and the phosphor layer comprises phosphor particles and a binder.
Further, when the transparent film is thin, the transparent film may be formed by combining water-impermeable materials, that is, a second water-impermeable layer may be coated on the transparent film, a phosphor layer may be coated on the second water-impermeable layer, and the first water-impermeable layer may be additionally coated on the phosphor layer, so as to completely isolate the phosphor layer from ambient moisture. Therefore, the characteristics of the phosphor particles can be stably maintained for a long time.
Further, the impervious layer is at least one of silicon resin, cycloolefin resin, fluorine compound resin, glass sol and silicon tin dioxide, and the thickness of the impervious layer is 50-75 um.
Further, the material of the phosphor particles is appropriately selected and used in accordance with the wavelength of the excitation light to be used and the target emission wavelength, for example, blue light is used as the excitation light, yellow phosphor that converts blue light into yellow light is used as the phosphor particles, and the intensity of the excitation blue light is adjusted so that light of a desired chromaticity is obtained by additive color mixing of the excitation light and the wavelength-converted light. The fluorescent powder particles mainly comprise a substrate, an activator and a reaction auxiliary agent, wherein the substrate is at least one of oxide, sulfide, oxysulfide, nitride, oxynitride and silicate, the activator is at least one of calcium, silicon, manganese, chromium, europium, zinc, aluminum, lead, phosphorus, arsenic and cerium, and the reaction auxiliary agent is at least one of boric acid, sodium fluoride, barium fluoride, magnesium carbonate and barium chloride.
Further, the thickness of phosphor layer is 50 ~ 100um, transparent film is 25um ~ 500 um's transparent macromolecular material for thickness, transparent macromolecular material is any one of polyester resin, polycarbonate, acryl resin and polyurethane.
Further, the adhesive is at least one of a heat-curable adhesive, an ultraviolet-curable adhesive, and a natural-curable adhesive.
Further, the adhesive is an acrylic adhesive or an epoxy adhesive.
The invention also provides the application of the fluorescent powder film in a display device.
Further, a so-called edge light type lighting and display device in which a light source is disposed on a side surface of a light guide plate is described. The phosphor film is disposed between the light source and the light guide plate. Light emitted from the light source is converted into light of a desired wavelength by the phosphor film. The converted light is guided by the light guide plate, and is emitted from the radiation surface of the illumination and display device by the reflection plate and the prism sheet. In the phosphor film, a phosphor layer formed by mixing phosphor particles in a binder is coated on a transparent film. The transparent film is located somewhere between the light source and the emitting surface of the lighting device, and the phosphor film is on the light guide plate. In this case, light emitted from the light source passes through the light guide plate, and is emitted from the light guide plate to the upper side by the reflection plate to be irradiated. The light is converted into light of a desired wavelength by the phosphor film, and the converted light is converted into illumination light by the prism sheet.
Further, a first phosphor film is disposed between the light source and the light guide plate; the second fluorescent powder film is positioned between the reflecting plate and the light guide plate. The light guide plate is formed of a transparent polymer such as an acrylic resin, a polycarbonate resin, or a cycloolefin resin, and guides light of the light source from the light incident surface to the light guide plate. Generally, the light source is a blue LED, and a minute prism group and a scattering structure are formed on a light emitting surface or a back surface of a light guide plate, from which light is irradiated uniformly on a plane. Generally, two or more light sources are placed on the light incident surface of the light guide plate. The microprism array is placed on the back of a light guide plate, and light propagating within the light guide plate is extracted into this face in a specific proportion. Reflected by the reflecting plate and irradiated from the light radiating surface of the light guide plate through the light guide plate. As the reflective plate, a polymer substrate such as a polyester resin or a transparent polymer substrate mixed with a white pigment having a high reflectance can be used as a reflective layer of a sputtering film of aluminum and silver or an alloy of silver and palladium.
To further illustrate, two blue lights are placed at both ends of the light channel. The light beams emitted from these blue light sources are uniformly propagated through the light tunnel, and are uniformly irradiated on the light incident surface of the light guide plate, being deviated to the surface of the light tunnel of the light guide plate or the prism formed against the surface, and in the illumination and display device of this embodiment, the red phosphor is distributed in the light tunnel. Thus, blue light can be wavelength converted to red light within the light channel, achieving uniform wavelength conversion and color mixing. Blue light is repeatedly reflected in the optical channel, and the light intensity is high, which can perform efficient wavelength conversion. The impervious layer is distributed on the whole surface of the light channel to prevent the red fluorescent powder particles of the light channel from being cracked by the moisture in the environment. On the other hand, a second phosphor film is disposed on the back surface of the light guide plate. And uniformly forming a green phosphor layer on the surface of the second phosphor film. In addition, the surface of the green fluorescent powder layer is coated with a water-impermeable layer. With this configuration, a lighting and display device having good moisture resistance and good color gamut characteristics and color mixing characteristics can be realized.
Further, the ultraviolet LED and the blue LED are disposed close to each other, and the three light sources are disposed in parallel. The emission wavelength of the ultraviolet LED was set to 365nm, and the emission wavelength of the blue LED was set to 460 nm. The epoxy resin containing fluorine is further coated on the red phosphor particles and cured to form a first phosphor film. As the second phosphor film, the above-mentioned fluorine-containing epoxy resin-coated green phosphor film was obtained by screen printing and curing in the same manner as the first phosphor film. The red phosphor and the green phosphor are excited by the ultraviolet LED, and the generated light is mixed with blue light from the blue LED, thereby presenting a wide color gamut range illumination and display device. In particular, the uv light used as excitation light has no influence on the color reproduction, but only a blue light mixture of the excited red and green light and blue light is considered. Therefore, the color of the lighting and display device can be easily adjusted. When the liquid crystal display device is irradiated with light mixed with ultraviolet rays, the liquid crystal becomes hot and adversely affects the eyes of the observer. Therefore, in this specific example, the ultraviolet absorbing film should be placed between the second phosphor film and the light incident surface of the light guide plate.
Further, the phosphor is uniformly coated on the surface of the second phosphor film. In this case, for example, if blue light is wavelength-converted into red light by the red phosphor, energy required for the wavelength conversion is absorbed, and the intensity of the blue light is decreased. In order to convert blue light into green light, it is not possible to illuminate green phosphor with lower intensity for green light. Therefore, in this embodiment, the regions of the red phosphor and the green phosphor are selectively printed on the second phosphor film to prevent division and overlapping with each other on the film surface. This allows efficient use of the exciting light. Between the red phosphor coated area and the green phosphor coated area, printing is on the transparent film. The screen is printed by the adhesive of red fluorescent powder or green fluorescent powder dispersed in each area, and the adhesive is coated on the impermeable layer. With this configuration, wavelength conversion of two wavelengths can be efficiently performed from one light source using one phosphor film without mixing and dispersing the phosphor into the optical channel. The phosphors can absorb the excitation light, converting the wavelength to excitation light of sufficient intensity without weakening the intensity of each other. The geometry of the segmented regions need not always be square, but may be a dot geometry or a polygon geometry. By adjusting the area density of the divided regions, the intensity of the wavelength-converted light can be easily adjusted. The thickness of the printed phosphor layer and the concentration of phosphor particles dispersed in the binder can be switched. In order to achieve sufficient color mixing, the print area is preferably as small as possible. The size of the printing area can be adjusted to any size within the range of 50um to 200um by using screen printing, pad printing or ink-jet printing modes, so that sufficient color mixing is realized. By changing the size of the printing area and the concentration of the fluorescent powder particles in each area, the fluorescent powder layer with uniformly distributed fluorescent powder concentration can be easily formed. Therefore, even if the phosphor layer is not placed in the space between the light source and the light incident surface of the light guide sheet, the phosphor field can be dispersedly formed.
Further, a diffusion plate is disposed above the light guide plate, a liquid crystal display element is disposed above the diffusion plate, and a reflection plate is disposed below the light guide plate. These components are protected by a case, and a light source mounted on a wiring substrate is placed on one side of a light guide plate. The light source illuminates the light guide plate and a phosphor film may be placed at a peripheral position of the light guide plate.
Compared with the prior art, the invention has the beneficial effects that:
the invention prepares a fluorescent powder film structure with high moisture-proof characteristic, so that a fluorescent powder film with longer service life can be realized and manufactured even when perovskite fluorescent powder which is easy to hydrolyze is used, and the liquid crystal display device which does not generate great influence in the design of a light guide plate, has good moisture-proof performance and has wide color gamut is provided by using the fluorescent powder film.
When such an illumination device is used for a high-resolution liquid crystal display device, the color gamut characteristic and the moisture resistance of the liquid crystal display device can be improved, and the illumination device can be used as a general planar light source and a general illumination and display device.
Detailed Description
The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
Example 1
The first step is as follows: mixing red fluorescent powder particles and green fluorescent powder particles into acrylic resin according to the proportion of 2:1, wherein the concentration of the acrylic resin is 30-40%, and the materials are prepared according to the sequence of firstly mixing the acrylic resin and then mixing the fluorescent powder particles, and firstly mixing the fluorescent powder particles and the fluorescent powder particles in a green-red manner (the principle of firstly mixing the fluorescent powder particles in a liquid-solid manner, and firstly mixing the fluorescent powder particles in a small amount and then mixing the fluorescent powder particles in a large amount).
The second step is that: and (3) stirring and defoaming the acrylic resin mixed with the fluorescent powder by using a vacuum defoaming stirrer, setting the time to be 10min, setting the vacuum degree value to be less than or equal to-95 Kpa, setting the ratio of rotation to revolution to be 1:1, setting the program of the rotating speed to be 800 revolutions/2 min +1200 revolutions/6 min +600 revolutions/2 min, and taking out the acrylic resin after the operation is finished.
The third step: adding the uniformly mixed fluorescent powder layer into a diaphragm type glue supply metering pump, selecting 50um of silicon resin as a waterproof layer and selecting 50um of polyester resin for a transparent film, and starting an air compressor to coat the 50um of fluorescent powder layer on the polyester resin film by using a coating die head according to preset pressure of 5-7 KG and speed of 5 m/s.
The fourth step: and (3) starting a water chiller to confirm that the cold water system works normally, starting a main power supply of the UV curing equipment, confirming that the flow of cooling water is more than 9, and curing and forming to finish the whole process of preparing the fluorescent film.
Example 2
The difference from example 1 is that the water impermeable layer is a cycloolefin resin.
Comparative example 1
The difference from example 1 is that it does not contain a water impermeable layer.
Comparative example 2
The difference from example 2 is that it does not contain a water impermeable layer.
Testing
The results of the test of the transmitted light performance of the phosphor films of examples 1 to 2 and comparative examples 1 to 2 obtained by blue light irradiation of a blue LED at a humidity of 90% RH and a temperature of 60 ℃ in the initial test and the 1000-post test are shown in tables 1 and 2, where table 1 is the data of the test of the luminous flux of examples 1 to 2 and table 2 is the data of the test of the luminous flux of comparative examples 1 to 2.
TABLE 1 EXAMPLES 1-2 optical Properties test data
| Sample (I) | Time (h) test conditions: 60 deg.C&90％RH | IF(mA) | VF(V) | P(mW) | Φ(lm) | Light effect (lm/W) |
| Example 1 | 0 | 59.99 | 3.027 | 181.6 | 18.49 | 101.56 |
| Example 2 | 0 | 59.98 | 3.024 | 181.4 | 18.45 | 101.88 |
| Example 1 | 1000 | 60.02 | 3.025 | 181.6 | 18.48 | 101.54 |
| Example 2 | 1000 | 60.01 | 3.025 | 181.5 | 18.36 | 101.87 |
TABLE 2 comparative examples 1-2 optical Property test data
As can be seen from the data in tables 1 and 2, the luminous flux phi (lm) of the phosphor film using the impermeable layer in examples 1-2 is basically not attenuated after 1000h, and the luminous flux phi (lm) of the phosphor film without the impermeable layer in comparative examples 1-2 is attenuated by more than 50% after 1000 h.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible, and all changes, equivalents and modifications that fall within the true spirit and scope of the invention are therefore intended to be embraced therein.
Claims (10)
1. The fluorescent powder film with high moisture resistance is characterized by comprising a transparent film, a waterproof layer and a fluorescent powder layer, wherein the fluorescent powder layer is sandwiched between the transparent film and the waterproof layer, and the fluorescent powder layer comprises fluorescent powder particles and an adhesive.
2. The phosphor film of claim 1, wherein a moisture impermeable layer is disposed between the moisture impermeable layer and the phosphor particles.
3. The phosphor film of claim 1 or 2, wherein the impermeable layer is at least one of a silicone resin, a cyclic olefin resin, a fluorine compound resin, a glass sol, and a tin dioxide silicon, and the impermeable layer has a thickness of 50 to 75 um.
4. The phosphor film of claim 3, wherein the phosphor particles are composed of a matrix of at least one of an oxide, a sulfide, a oxysulfide, a nitride, an oxynitride, and a silicate, an activator of at least one of calcium, silicon, manganese, chromium, europium, zinc, aluminum, lead, phosphorus, arsenic, and cerium, and a reaction promoter of at least one of boric acid, sodium fluoride, barium fluoride, magnesium carbonate, and barium chloride.
5. The phosphor film of claim 3, wherein the thickness of the phosphor layer is 50-100 um, the transparent film is a transparent polymer material with a thickness of 25-500 um, and the transparent polymer material is any one of polyester resin, polycarbonate, acrylic resin and polyurethane.
6. The phosphor film of claim 3, wherein the adhesive is at least one of a heat-curable adhesive, an ultraviolet-curable adhesive, and a naturally-curable adhesive.
7. The phosphor film of claim 6, wherein the adhesive is an acrylic adhesive or an epoxy adhesive.
8. Use of the phosphor film of any of claims 1 to 7 in a display device.
9. The use of the phosphor film of claim 8 in a display device, wherein the phosphor film is disposed between a light source and a light guide plate.
10. The use of the phosphor film of claim 8 in a display device, wherein the phosphor film is disposed between a reflector plate and a light guide plate.
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Cited By (1)
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