CN111965748B - Optically variable pigment - Google Patents

Optically variable pigment Download PDF

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Publication number
CN111965748B
CN111965748B CN202010648010.1A CN202010648010A CN111965748B CN 111965748 B CN111965748 B CN 111965748B CN 202010648010 A CN202010648010 A CN 202010648010A CN 111965748 B CN111965748 B CN 111965748B
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oxide
refractive index
index film
film layer
optically variable
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CN111965748A (en
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蔡宏亮
陈章荣
潘硕
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Huizhou Foryou Optical Technology Co ltd
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Huizhou Foryou Optical Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films

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Abstract

The application provides an optically variable pigment. The optically variable pigment comprises a plurality of film layers including a plurality of high refractive index film layers and a plurality of low refractive index films which are alternately stackedThe refractive index of the high refractive index film layer is larger than that of the low refractive index film layer, and the film layer of the optically variable pigment is (a)1Hb1L)n(a1Hb2L)m(a1Hb3La1H)s(b2La1H)m(b1La1H)nThe arrangement is that the plurality of film layers are in a multi-peak structure, and the peak value of the visible light spectrum is greater than or equal to 2, so that the display color of the optically variable pigment at a first visual angle is achromatic, and the display color at a second visual angle is chromatic. The optically variable pigment of the present application can realize the conversion of display colors from achromatic colors to chromatic colors with angle changes according to the principle of light interference and the subtractive color method and the complementary achromatic method of colors.

Description

Optically variable pigment
Technical Field
The application relates to the field of color-changing pigments, in particular to an optically variable pigment.
Background
The optically variable pigment is prepared by depositing multiple layers of film structures with interference effect on a proper substrate by vapor deposition or other methods in a certain order, and when the observation angle changes, the optical path difference changes, so that the light with different wavelengths at different angles is subjected to constructive interference, and the color variation along with the angle is realized.
The optically variable pigment can be applied to currency, securities, invoices and other situations needing anti-counterfeiting. With the development of economy, optically variable pigments have been expanded to be applied to the decoration industry, such as cosmetic pigments, automobile coating pigments, high-end toy pigments, and the like.
With the wider application, the requirements on the color change performance of the optically variable pigment are higher and higher.
Disclosure of Invention
The application provides an optically variable pigment, which can realize that the display color at a first visual angle is achromatic and the display color at a second visual angle is chromatic.
In order to solve the technical problem, the application adopts a technical scheme that: the optically variable pigment comprises a plurality of film layers, wherein the film layers comprise a plurality of high-refractive-index film layers and a plurality of low-refractive-index film layers which are alternately stacked, and the refractive index of the high-refractive-index film layers is greater than that of the low-refractive-index film layersRefractive index, a plurality of film layers1Hb1L)n(a1Hb2L)m(a1Hb3La1H)s(b2La1H)m(b1La1H)nArranging a plurality of film layers in a multi-peak structure, wherein the peak value of a visible light spectrum is greater than or equal to 2, so that the display color of the optically variable pigment at a first visual angle is achromatic, the display color at a second visual angle is chromatic, H is a high-refractive-index film layer with the optical thickness of one fourth of a design wavelength, L is a low-refractive-index film layer with the optical thickness of one fourth of the design wavelength, and a1、b1、b2And b3Is the film thickness coefficient, m, n and s are the stacking period of the film, 0 < a1＜3，0＜b1＜3，0＜b2B3 is more than 3, b is more than 0 and less than 3, m and s are positive integers, n is more than or equal to 0, and n is an integer.
The material of the high-refractive-index film layer is a material with a refractive index larger than 1.65; the material of the low-refractive-index film layer is a material with a refractive index less than or equal to 1.65.
Wherein the material of the high-refractive-index film layer comprises at least one of lanthanum titanate, titanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, ferroferric oxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide and tungsten trioxide; the material of the low refractive index film layer comprises at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride and lithium fluoride.
Wherein the physical thickness of the high refractive index film layer is 10-400nm, and the physical thickness of the low refractive index film layer is 10-700 nm.
In order to solve the above technical problem, another technical solution adopted by the present application is: an optically variable pigment is provided, which comprises a plurality of film layersComprises a plurality of high refractive index film layers and a plurality of low refractive index film layers which are alternately stacked, wherein the refractive index of the high refractive index film layers is greater than that of the low refractive index film layers, and the film layers are (a)1Lb1H)n(a2Lb2Ha2L)m(b1Ha1L)nArranged such that the display colour of the optically variable pigment at a first viewing angle is achromatic and at a second viewing angle is chromatic, wherein a1、a2、b1And b2The film thickness coefficient is shown in the specification, H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, m and n are the stacking period of the film layers, and a is more than 01＜3，0＜a2＜3，0＜b1＜3，0＜b2Less than 3, m is a positive integer, n is not less than 0, and n is an integer.
The material of the high-refractive-index film layer is a material with a refractive index larger than 1.65; the material of the low-refractive-index film layer is a material with a refractive index less than or equal to 1.65.
Wherein the material of the high-refractive-index film layer comprises at least one of lanthanum titanate, titanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, ferroferric oxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide and tungsten trioxide; the material of the low refractive index film layer comprises at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride and lithium fluoride.
Wherein the physical thickness of the high refractive index film layer is 10-400nm, and the physical thickness of the low refractive index film layer is 10-700 nm.
In order to solve the above technical problem, the present application adopts another technical solution: an optically variable pigment is provided, which comprises a plurality of film layers including a plurality of high folds alternately stackedA high refractive index film layer having a refractive index higher than that of the low refractive index film layer, and a plurality of low refractive index film layers of (a)1Hb1L)n(a2Hb2La2H)mArranging that the visible spectrum peak is greater than or equal to 2 such that the optically variable pigment exhibits a neutral color at a first viewing angle and a colored color at a second viewing angle, wherein a1、a2、b1And b2The film thickness coefficient is shown in the specification, H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, m and n are the stacking period of the film layers, and a is more than 01＜3，0＜a2＜3，0＜b1＜3，0＜b2< 3, m and n are positive integers, a1≠a2，b1≠b2。
Wherein the physical thickness of the high refractive index film layer is 10-400nm, and the physical thickness of the low refractive index film layer is 10-700 nm.
The beneficial effect of this application is: be different from prior art, the photochromic pigment of this application is including alternately piling up the high refracting index rete and the low refracting index rete that set up, according to the subtractive method and the complementary achromatism of the interference principle and the colour of light, and this photochromic pigment can show achromatic at first visual angle, shows colouredly at the second visual angle, and the photochromic pigment of this application has better color development effect, and has higher anti-fake performance, but this photochromic pigment wide application in anti-fake field and decoration trade.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of one embodiment of optically variable pigments provided herein;
fig. 2 is a schematic structural view of another embodiment of an optically variable pigment provided herein;
fig. 3 is a schematic structural view of another embodiment of the optically variable pigment provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The present application first provides an optically variable pigment, and referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the optically variable pigment provided herein. The optically variable pigment of the present embodiment includes a plurality of film layers, the plurality of film layers includes a plurality of high refractive index film layers 11 and a plurality of low refractive index film layers 12 alternately stacked, the refractive index of the high refractive index film layers 11 is greater than the refractive index of the low refractive index film layers 12, that is, the optically variable pigment of the present embodiment is a multi-film structure including a plurality of high refractive index film layers 11 and a plurality of low refractive index film layers 12.
In this embodiment, the plurality of film layers of the optically variable pigment may be (a)1Hb1L)n(a1Hb2L)m(a1Hb3La1H)s(b2La1H)m(b1La1H)nAnd (4) arranging. H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, and a1、b1、b2And b3Is the film thickness coefficient, m, n and s are the stacking period of the film, 0 < a1＜3，0＜b1＜3，0＜b2＜3，0＜b3Less than 3, m and s are both positive integers, n is more than or equal to 0, and n is an integer. The optically variable pigment of the embodiment has a multimodal structure, i.e. the visible light spectrum has a plurality of peaks, and the peak of the visible light spectrum is greater than or equal to 2. According to the principle of light interference, the color reduction method and the complementary color reduction method, the film structure of the optically variable pigment of the present embodiment is designed such that the display color of the optically variable pigment at the first viewing angle is achromatic and the display color at the second viewing angle is chromatic. The achromatic color may be silver white, gray, black, or transparent, and the chromatic color may be red, yellow, blue, or green.
In this embodiment, the optical thickness of each film layer is one quarter of the design wavelength multiplied by the thickness factor. For example, film a1The optical thickness of H is one quarter of the design wavelength multiplied by a1. m, n and s are stacking periods of the film layers, e.g., (a)1Hb1L)nRepresents: basic stacking period of a quarter1High refractive index layer 11 and quarter-b of designed wavelength thickness1Designing the low refractive index layer 12 with a wavelength thickness, and repeating the basic stacking period n times, wherein n may be 1 time, 2 times, 3 times, and the like, and may be selectively set according to actual needs.
Specifically, the first viewing angle may be a viewing angle (front side of the optically variable pigment) where the viewing angle is perpendicular to the optically variable pigment, and the second viewing angle may be a viewing angle (side of the optically variable pigment) where the viewing angle is not perpendicular to the optically variable pigment, that is, the optically variable pigment may realize that the front display color is achromatic and the side display color is chromatic. In other embodiments, the first viewing angle may be a viewing angle (side of the optically variable pigment) not perpendicular to the optically variable pigment, and the second viewing angle may be a viewing angle (front of the optically variable pigment) perpendicular to the optically variable pigment, that is, the optically variable pigment may also realize the effect that the front display color is chromatic and the side display color is achromatic.
Further, the high refractive index film layer 11 may be a high refractive index layer, and the low refractive index film layer 12 may be a low refractive index layer. Specifically, the material of the high refractive index film layer 11 is a material having a refractive index greater than 1.65, and the material of the low refractive index film layer 12 is a material having a refractive index less than or equal to 1.65. The optically variable pigment comprises high refractive index film layers 11 and low refractive index film layers 12 which are alternately stacked, wherein the film structure can start with the high refractive index film layers 11 or the low refractive index film layers 12 and can also end with the high refractive index film layers 11 or the low refractive index film layers 12.
Further, the physical thickness of the high refractive index film layer 11 may be 10 to 400nm, and the physical thickness of the low refractive index film layer 12 may be 10 to 700 nm. The thicknesses and the stacking modes of the high refractive index film layer 11 and the low refractive index film layer 12 are reasonably set, in light interference, interference light is subjected to multi-stage interference, and multi-stage interference and color fading phenomena of complementary colors (for example, red corresponds to green, blue corresponds to orange, and purple corresponds to yellow) are generated, so that the optically variable pigment displays an achromatic color at a first visual angle and displays a chromatic color at a second visual angle.
The material of the high refractive index film layer 11 may include at least one of lanthanum titanate, trititanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, triiron tetroxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide, and tungsten trioxide.
The material of the low refractive index film layer 12 may include at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride, and lithium fluoride.
The optically variable pigment of the present embodiment is capable of displaying a color, such as silver white or gray white, etc., at a first viewing angle and displaying a color at a second viewing angle. Namely, the film layer structure of the embodiment can realize the effect that silvery white or gray white is displayed on the front surface of the optically variable pigment, and color is displayed on the side surface; the effect of displaying color on the front surface and displaying silver white or gray white on the side surface of the optically variable pigment can be realized by reasonably configuring the thickness of the film layer.
In a specific embodiment, a1、b1、b2And b3Can satisfy the following formula a1＝b1＝b2，2a1＝b3In the embodiment, wherein a1Can be 0.5, 1, etc. In the film layer structure of the present embodiment, interference light also undergoes multi-level interference in light interference, and multi-level interference achromatic phenomenon occurs in complementary colors (red corresponds to green, blue corresponds to orange, and purple corresponds to yellow). The visible light spectrum of the main white object should be a high reflection flat line, and if one pair of complementary color light waves is extracted to only influence the color gray scale perceived by naked eyes and not destroy the achromatic balance to cause the color to appear, the optically variable pigment can display an achromatic color, such as silver white, at a first viewing angle. However, the color balance is lost due to the inconsistency of the equivalent phase change in the side view process, and colors appear. For example, the sensitivity of human eyes to 520nm (green) color is very high and the sensitivity to red is not high, and when the color is reduced, the bandwidth is reduced, the red is more and the green is less, so that the effect that the second visual angle of the optically variable pigment displays cyan can be realized. The optically variable pigment of the embodiment can display silvery white at a first visual angle, display a cyan-green effect at a second visual angle, and has a good display effect and a high anti-counterfeiting performance.
In another embodiment, a1、b1、b2And b3The following formula can be satisfied: a is1＝b1，2a1＝b2，3a1＝b3. Alternatively, a1May be 0.5 or 0.2, etc. The optically variable pigment of this embodiment can realize showing grey white at optically variable pigment's first visual angle, shows purple green's effect at the second visual angle, and the color development effect is better.
In yet another embodiment, a1、b1、b2And b3The following formula can be satisfied: 1.5a1＝b1，a1＝b2，2a1＝b3. Alternatively, a1May be 0.5 or 1, etc. The optically variable pigment of the embodiment can display gray white at the first visual angle of the optically variable pigment, and display orange red at the second visual angle, and the color development effect is good.
In other embodiments, the optically variable pigment also includes high refractive index film layers 11 and low refractive index film layers 12 stacked alternately, and the optically variable pigment can also be implemented by other film layer structures to display achromatic color at a first viewing angle and chromatic color at a second viewing angle, which is not limited herein.
In summary, the optically variable pigment of the present embodiment includes the high refractive index film layer 11 and the low refractive index film layer 12 stacked alternately, and according to the principle of light interference, a color reduction method and a complementary color reduction method are adopted, the film structure of the optically variable pigment of the present embodiment is reasonably arranged, so that the optically variable pigment displays an achromatic color, such as silver white or gray white, at a first viewing angle, and displays a color at a second viewing angle, that is, the optically variable pigment can realize a conversion from the achromatic color (such as silver white or gray white) to a color or from the color to the achromatic color (such as silver white or gray), thereby improving the display effect of the optically variable pigment, and having a high anti-counterfeiting performance.
The present application further provides another optically variable pigment, as shown in fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the optically variable pigment provided in the present application, and different from the previous embodiment, the plurality of film layers of the optically variable pigment of the present embodiment are (a)1Lb1H)n(a2Lb2Ha2L)m(b1Ha1L)nArranging that the optically variable pigment is of a multimodal structure and the peak of the visible spectrum is greater than or equal to 2, such that the optically variable pigment exhibits a neutral display colour at a first viewing angle and a coloured display colour at a second viewing angle, wherein a1、a2、b1And b2The film thickness coefficient is shown in the specification, H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, m and n are the stacking period of the film layers, and a is more than 01＜3，0＜a2＜3，0＜b1＜3，0＜b2Less than 3, m is a positive integer, n is not less than 0, and n is an integer.
Specifically, the optically variable pigment of the present embodiment includes a high refractive index film layer 11 and a low refractive index film layer 12 alternately stacked, and the film structure is configured to enable the optically variable pigment to display a transparent color at a first viewing angle and a color at a second viewing angle.
Wherein the first visual angle can be the front surface of the optically variable pigment, and the second visual angle can be the side surface of the optically variable pigment; in other embodiments, the first viewing angle may also be the side of the optically variable pigment; the second viewing angle is the front side of the optically variable pigment. Namely, the film layer structure of the embodiment can realize the effect of displaying transparent color on the front surface and displaying colorful color on the side surface of the optically variable pigment; the effect of displaying color on the front surface and transparent color on the side surface of the optically variable pigment can be realized by reasonably configuring the thickness of the film layer.
Through the inconsistent equivalent phase change in the side observation process, the effects that the visible spectrum is completely transmitted but the near infrared has certain reflection, namely the front is transparent and the side is red, can be designed. In a specific embodiment, 2a1＝3b1＝3a2，4b1＝b2. The optically variable pigment of the embodiment can realize the effect of displaying transparent color at the first visual angle of the optically variable pigment and displaying colorful color at the second visual angle of the optically variable pigment, and the display effect is better.
In this embodiment, the high refractive index film layers 11 and the low refractive index film layers 12 are alternately stacked, the refractive index of the high refractive index film layers 11 is greater than that of the low refractive index film layers 12, and the high refractive index film layers 11 may be made of a material having a refractive index greater than 1.65; the material of the low refractive index film layer 12 may be a material having a refractive index of less than or equal to 1.65. The physical thickness of the high refractive index film layer 11 is 10-400nm, and the physical thickness of the low refractive index film layer 12 is 10-700 nm.
The material of the high refractive index film layer 11 may include at least one of lanthanum titanate, trititanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, triiron tetroxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide, and tungsten trioxide. The material of the low refractive index film layer 12 may include at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride, and lithium fluoride.
Different from the prior art, the optically variable pigment of the embodiment can display transparent color at a first visual angle and display color at a second visual angle, namely, the optically variable pigment can realize the conversion from the transparent color to the color and also realize the conversion from the color to the transparent color along with the change of the angle, so that the optically variable pigment has stronger anti-counterfeiting performance and better color display effect.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the optically variable pigment provided in the present application. The optically variable pigment comprises a plurality of film layers, wherein the film layers comprise a plurality of high-refractive-index film layers 11 and a plurality of low-refractive-index film layers 12 which are alternately stacked, the refractive index of the high-refractive-index film layers 11 is greater than that of the low-refractive-index film layers 12, and the film layers are (a)1Hb1L)n(a2Hb2La2H)mArranging the visible light spectrum peak value to be more than or equal to 2 so that the display color of the optically variable pigment at a first visual angle is achromatic and the display color at a second visual angle is chromatic, wherein a1, a2, b1 andb2 is a film thickness coefficient, H is a high refractive index film with the optical thickness being one fourth of the design wavelength, L is a low refractive index film with the optical thickness being one fourth of the design wavelength, m and n are the stacking period of the films, 0 is more than a1 and less than 3, 0 is more than a2 and less than 3, 0 is more than b1 and less than 3, 0 is more than b2 and less than 3, m and n are positive integers, a1 is not equal to a2, and b1 is not equal to b 2.
The optically variable pigment of the embodiment has an asymmetric structure, simplifies the structure of the film layer, saves the production cost, can realize the effect of changing color into achromatic color, has a good display effect and has high anti-counterfeiting performance. In addition, the two film stacks of the embodiment can realize the effect of changing the color into the achromatic color by changing the front and the back positions.
Other parameter information of the film structure of this embodiment is the same as that of the above embodiment, and is not described herein again.
The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims (7)

1. An optically variable pigment comprising a plurality of film layers including a plurality of high refractive index film layers and a plurality of low refractive index film layers alternately stacked, the high refractive index film layers having a refractive index higher than that of the low refractive index film layers, the plurality of film layers being (a)1Hb1L)n(a1Hb2L)m(a1Hb3La1H)s(b2La1H)m(b1La1H)nArranging the plurality of film layers to be of a multi-peak structure, wherein the peak value of a visible light spectrum is greater than or equal to 2, so that the display color of the optically variable pigment at a first visual angle is achromatic and the display color at a second visual angle is chromatic according to the interference principle of light, the subtractive color method of color and the complementary achromatic method, wherein H is a high-refractive-index film layer with the optical thickness being one fourth of the design wavelength, and L is a high-refractive-index film layer with the optical thickness being the design wavelengthA low refractive index film layer of one quarter of the wavelength, wherein a1、b1、b2And b3Is the film thickness coefficient, m, n and s are the stacking period of the film, 0 < a1＜3，0＜b1＜3，0＜b2＜3，0＜b3Less than 3, m and s are both positive integers, n is more than or equal to 0 and is an integer, the physical thickness of the high-refractive-index film layer is 10-400nm, and the physical thickness of the low-refractive-index film layer is 10-700 nm.
2. The optically variable pigment of claim 1, wherein the material of the high refractive index film layer is a material with a refractive index of more than 1.65; the low-refractive-index film layer is made of a material with a refractive index smaller than or equal to 1.65.
3. Optically variable pigments according to claim 2,
the material of the high-refractive-index film layer comprises at least one of lanthanum titanate, trititanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, ferroferric oxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide and tungsten trioxide;
the material of the low-refractive-index film layer comprises at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride and lithium fluoride.
4. An optically variable pigment comprising a plurality of film layers including a plurality of high refractive index film layers and a plurality of low refractive index film layers alternately stacked, the high refractive index film layers having a refractive index higher than that of the low refractive index film layers, the plurality of film layers being (a)1Lb1H)n(a2Lb2Ha2L)m(b1Ha1L)nArranged so that the optically variable pigment exhibits an achromatic color at a first viewing angle and a chromatic color at a second viewing angle according to the principle of interference of light, subtractive color of color, and complementary achromatic color, wherein a1、a2、b1And b2The film thickness coefficient is shown in the specification, H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, m and n are the stacking period of the film layers, and a is more than 01＜3，0＜a2＜3，0＜b1＜3，0＜b2Less than 3, m is a positive integer, n is more than or equal to 0 and is an integer, the physical thickness of the high refractive index film layer is 10-400nm, and the physical thickness of the low refractive index film layer is 10-700 nm.
5. The optically variable pigment of claim 4, wherein the material of the high refractive index film layer is a material with a refractive index of more than 1.65; the low-refractive-index film layer is made of a material with a refractive index smaller than or equal to 1.65.
6. Optically variable pigments according to claim 5,
the material of the high-refractive-index film layer comprises at least one of lanthanum titanate, trititanium pentoxide, niobium pentoxide, zinc sulfide, zinc oxide, zirconium oxide, titanium dioxide, carbon, indium oxide, indium tin oxide, tantalum pentoxide, cerium oxide, yttrium oxide, europium oxide, iron oxide, ferroferric oxide, hafnium nitride, hafnium carbide, hafnium oxide, lanthanum oxide, magnesium oxide, neodymium oxide, praseodymium oxide, samarium oxide, antimony trioxide, silicon carbide, silicon nitride, silicon monoxide, selenium trioxide, tin oxide and tungsten trioxide;
the material of the low-refractive-index film layer comprises at least one of silicon dioxide, aluminum oxide, magnesium fluoride, aluminum fluoride, cerium fluoride, lanthanum fluoride, neodymium fluoride, samarium fluoride, barium fluoride, calcium fluoride and lithium fluoride.
7. An optically variable pigment, characterized in that said optically variable pigmentThe pigment comprises a plurality of film layers, the film layers comprise a plurality of high-refractive-index film layers and a plurality of low-refractive-index film layers which are alternately stacked, the refractive index of the high-refractive-index film layers is greater than that of the low-refractive-index film layers, and the film layers are (a)1Hb1L)n(a2Hb2La2H)mArranging that the visible spectrum peak is greater than or equal to 2 so that the display color of the optically variable pigment is achromatic at a first viewing angle and chromatic at a second viewing angle according to the principle of light interference, subtractive color and complementary achromatic method, wherein a1、a2、b1And b2The film thickness coefficient is shown in the specification, H is a high refractive index film layer with the optical thickness of one fourth of the design wavelength, L is a low refractive index film layer with the optical thickness of one fourth of the design wavelength, m and n are the stacking period of the film layers, and a is more than 01＜3，0＜a2＜3，0＜b1＜3，0＜b2< 3, m and n are each a positive integer, a1≠a2，b1≠b2The physical thickness of the high refractive index film layer is 10-400nm, and the physical thickness of the low refractive index film layer is 10-700 nm.
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ES2356735T3 (en) * 2002-05-31 2011-04-12 Jds Uniphase Corporation OPTICALLY DIFRACTIVE PIGMENTS FULLY DIELECTRIC.

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