CN115663092A - Quantum dot color conversion layer with static liquid drop array for reducing light crosstalk and preparation method thereof - Google Patents
Quantum dot color conversion layer with static liquid drop array for reducing light crosstalk and preparation method thereof Download PDFInfo
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Abstract
A quantum dot color conversion layer for reducing optical crosstalk of a static liquid drop array and a preparation method thereof relate to the technical field of Micro LED display and solve the problems of low photoluminescence efficiency, short service life and serious optical crosstalk effect in the prior art. Compared with the quantum dot color conversion layer prepared by the traditional microfluidic technology, the method adopts a special static droplet array design, can prepare mutually-separated droplet quantum dot pixels, avoids the serious optical crosstalk effect caused by end-to-end connection among the same pixel particles, has relatively simple preparation method and less material consumption, can avoid complex packaging, and can prepare the quantum dot color conversion layer in batches quickly.
Description
Technical Field
The invention relates to the technical field of Micro LED display, in particular to a quantum dot color conversion layer for reducing light crosstalk of a static liquid drop array and a preparation method thereof.
Background
Compared with Liquid Crystal Displays (LCDs) and Organic Light Emitting Diodes (OLEDs), micro LEDs have received much attention because of their advantages such as higher light emission brightness, longer lifetime, wider color gamut of emitted light, and are expected to become the next generation of display technologies. In commercial applications, micro LED displays have greater potential for applications due to their self-emissive properties, better outdoor visibility, extremely strong environmental tolerance, compact and stable microstructure, and excellent resolution.
Due to the lattice mismatch of the materials, monolithic integration of RGB Micro LED substrates on a single wafer is difficult to achieve by a single and efficient epitaxial technique. Therefore, the method is a very simple and effective method for realizing full-color display by taking a blue light or Ultraviolet (UV) Micro LED as an excitation light source and combining a red-green quantum dot color conversion layer. The preparation schemes of the quantum dot color conversion layer mainly comprise two schemes: one is to spray quantum dot solution on an LED or a transparent substrate to realize full-color display by an ink-jet printing technology; the other method is photolithography, in which quantum dots and photoresist are mixed and patterned by various photolithography methods. But it is difficult to achieve color conversion layer preparation with pixel size less than 30 microns by ink jet printing. The photolithography technique requires mixing with a photoresist material for photolithography and development, which causes the waste of quantum dots, and the doped photoresist easily degrades the performance of the quantum dots, thereby reducing the photoluminescence efficiency and greatly shortening the service life. At present, the quantum dot color conversion layer prepared by adopting the microfluidic technology is not separated because each pixel point with the same color is connected with each other, so that the serious optical crosstalk effect can exist and the display effect is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a quantum dot color conversion layer with a static liquid drop array for reducing optical crosstalk and a preparation method thereof, and solves the problems of low photoluminescence efficiency, short service life and serious optical crosstalk effect in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a quantum dot color conversion layer for reducing optical crosstalk by an array of static droplets, the quantum dot color conversion layer comprising: the transparent substrate and the micro-channel substrate are connected in a bonding manner; the micro flow channel substrate includes: the quantum dot micro-flow channels are of the same structure, do not intersect with each other and are distributed in a snake shape; each quantum dot position micro flow channel comprises: the auxiliary flow channel, the liquid drop generating point and the exhaust channel; the quantum dot solution circulating in the auxiliary flow channel sequentially enters the plurality of liquid drop generating point positions and is exhausted through an exhaust channel connected with the liquid drop generating point positions; the quantum dot solutions in the two quantum dot position micro flow channels with the same structure are respectively a red quantum dot solution and a green quantum dot solution.
Preferably, the droplet generation sites form a droplet quantum dot array, and two droplet generation sites with the same sequence and one or two adjacent auxiliary flow channels form an auxiliary flow channel transmission region to form a group of RGB pixels.
Preferably, the two quantum dot micro flow channels at least comprise one group of RGB pixel arrangement.
Preferably, each auxiliary flow passage is provided with a liquid inlet and a liquid outlet.
Preferably, the other end of the exhaust passage is connected to the auxiliary flow passage.
Preferably, the device further comprises a main exhaust channel, the main exhaust channel is located between the two quantum dot micro channels with the same structure, and the other end of the exhaust channel is connected with the main exhaust channel.
The preparation method of the quantum dot color conversion layer with the static liquid drop array to reduce the optical crosstalk comprises the following steps:
the method comprises the following steps: preparing a photoresist substrate containing a raised pixel array pattern by utilizing a photoetching process according to the arrangement of the liquid drop generating points, wherein the photoresist substrate is used as a template for micro-channel reverse molding;
step two: pouring, bubble removing, curing and mould reversing the sol for preparing the micro-channel substrate on the photoetching glue base plate to prepare the micro-channel substrate, and punching holes at the positions of the liquid inlet and the liquid outlet; bonding the micro-channel substrate and the transparent substrate to prepare a micro-fluidic chip;
step three: horizontally placing the bonded microfluidic chip, respectively injecting a red quantum dot solution and a green quantum dot solution from corresponding liquid inlet holes to fill the auxiliary flow channel and the liquid drop quantum dot array, and then flowing out from the liquid outlet holes, and discharging redundant air through an exhaust channel;
step four: after the quantum dot solution is injected, transparent sealing liquid is respectively injected from the two liquid inlets to occupy the auxiliary flow channel, and the quantum dot solution in the auxiliary flow channel is fully discharged;
step five: fully exposing the microfluidic chip after the step four to an ultraviolet environment, solidifying the quantum dot pixel positions of the liquid drops, heating the microfluidic chip at constant temperature, and solidifying the transparent sealing liquid to form a quantum dot color conversion layer;
step six: and aligning and bonding the quantum dot color conversion layer and the blue light Micro-LED to realize full-color display.
Preferably, the transparent substrate is made of PDMS, glass, quartz or acrylic plate material; the micro-channel substrate is made of PDMS, PMMA, PI and PVA materials.
Preferably, the refractive index of the transparent sealing liquid is 1.4 to 1.41, the refractive index of the PDMS micro flow channel substrate is 1.406, and the viscosity of the transparent sealing liquid is 350cs.
The invention has the beneficial effects that: compared with the quantum dot color conversion layer prepared by the traditional microfluidic technology, the method adopts a special static droplet array design, can prepare mutually-separated droplet quantum dot pixels, avoids the serious optical crosstalk effect caused by end-to-end connection among the same pixel particles, has relatively simple preparation method and less material consumption, can avoid complex packaging, and can prepare the quantum dot color conversion layer in batches quickly.
Drawings
FIG. 1 is a cross-sectional view of a micro flow channel substrate in a quantum dot color conversion layer with static droplet arrays to reduce optical crosstalk according to the present invention;
FIG. 2 is a top view of a micro flow channel substrate of a quantum dot color conversion layer embodiment of the invention with static droplet arrays to reduce optical crosstalk;
FIG. 3 is a top view of a micro flow channel substrate of a quantum dot color conversion layer embodiment of the invention with static droplet arrays to reduce optical crosstalk;
FIG. 4 is a flow chart of a method of making a quantum dot color conversion layer according to the present invention;
FIG. 5 is a kinetic diagram of quantum dot color conversion layer bonding and solution injection in accordance with the present invention;
fig. 6 is a schematic diagram of integration of a quantum dot color conversion layer and a blue light Micro-LED backlight array according to a third embodiment of the invention.
In the figure: 1. micro flow channel substrate, 2, photoresist substrate, 3, transparent substrate, 11, red droplet quantum dot site, 111, red droplet auxiliary flow channel, 112, red droplet exhaust channel, 113, red droplet auxiliary flow channel inlet, 114, red droplet auxiliary flow channel outlet, 12, green droplet quantum dot site, 121, green droplet auxiliary flow channel, 122, green droplet exhaust channel, 123, green droplet auxiliary flow channel inlet, 124, green droplet auxiliary flow channel outlet, 13, auxiliary flow channel transmission region, 14, first RGB pixel arrangement, 15, second RGB pixel arrangement, 16, main exhaust channel, 161, first exhaust port, 162, second exhaust port, 4, quantum dot color conversion layer, 41, red quantum dot solution, 42, green quantum dot solution, 43, transparent sealing liquid, 5, blue light Micro-LED array backlight layer, 51, blue light Micro-LED array substrate, 52, blue light Micro-LED array, 53, black isolation grid.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a static droplet array reduces light crosstalk for a quantum dot color conversion layer comprising: a transparent substrate 3 and a micro flow channel substrate 1 which are bonded; the micro flow channel substrate 1 includes: the quantum dot micro-flow channels are of the same structure, do not intersect with each other and are distributed in a snake shape; each quantum dot position micro flow channel comprises: the auxiliary flow channel, the liquid drop generating point and the exhaust channel; the quantum dot solution circulating in the auxiliary flow channel sequentially enters the plurality of liquid drop generating point positions and is exhausted through an exhaust channel connected with the liquid drop generating point positions; the quantum dot solutions in the two quantum dot position micro flow channels with the same structure are a red quantum dot solution 41 and a green quantum dot solution 42 respectively.
Example 1:
as shown in fig. 2, the specific pattern of the micro flow channel substrate 1 includes: a red drop quantum dot site microchannel and a green drop quantum dot site microchannel; wherein red liquid drop quantum dot position miniflow channel includes: a red drop quantum dot position 11, a red drop auxiliary flow channel 111, a red drop exhaust flow channel 112, a red drop auxiliary flow channel liquid inlet 113 and a red drop auxiliary flow channel liquid outlet 114. The green drop quantum dot site microchannel includes: a green drop quantum dot position 12, a green drop auxiliary flow channel 121, a green drop exhaust flow channel 122, a green drop auxiliary flow channel inlet 123 and a green drop auxiliary flow channel outlet 124. Further comprising: an auxiliary channel transmission region 13, a first RGB pixel arrangement 14 and a second GRB pixel arrangement 15. Wherein the red droplet quantum dot site 11 is respectively connected with the red droplet auxiliary flow channel 111 and the red droplet exhaust flow channel 112; one end of the red droplet exhaust channel 112 is connected to the red droplet quantum dot site 11, and the other end is connected to the red droplet auxiliary channel 111. The red light quantum dot solution 41 enters the red liquid drop auxiliary flow channel 111 through the red liquid drop auxiliary flow channel liquid inlet 113, and under the action of pressure, the red light quantum dot solution 41 flows forwards along with the red liquid drop auxiliary flow channel 111, sequentially enters the plurality of red liquid drop quantum dots 11, and flows out through the red liquid drop auxiliary flow channel liquid outlet 114. Each red droplet quantum dot site 11 is provided with a red droplet exhaust channel 112, so that the red droplet quantum dot solution 41 can be easily filled in all the red droplet quantum dot sites 11, and because the red droplet exhaust channel 112 has a small size relative to the red droplet auxiliary channel 111, because of a large pressure difference, the red droplet quantum dot solution 42 is not easy to enter the red droplet exhaust channel 112 after being filled in the red droplet quantum dot sites 11, but flows along the red droplet auxiliary channel 111 and flows out from the red droplet auxiliary channel outlet 114. The structure of the green quantum dot site micro flow channel and the direction of the green quantum dot solution 42 are completely the same as those of the red quantum dot site micro flow channel. Sequentially assigning a serial number to each quantum dot from the liquid inlet according to the sequence of injecting the quantum dot solution, wherein each quantum dot forms a liquid drop quantum dot array; the red drop quantum dot position 11 and the green drop quantum dot position 12 with the same serial number and one or two adjacent auxiliary flow channels form an auxiliary flow channel transmission area 13, and a group of RGB pixel arrangement is formed. A first RGB pixel arrangement 14 and a second GRB pixel arrangement 15 as shown in figure 2. And the auxiliary flow channel transmission area 13 is used for blue light Micro-LED backlight transmission.
Example 2:
as shown in fig. 3, the specific pattern of the micro flow channel substrate 1 includes: a red drop quantum dot site microchannel and a green drop quantum dot site microchannel; wherein red liquid drop quantum dot position miniflow channel includes: a red drop quantum dot position 11, a red drop auxiliary flow channel 111, a red drop exhaust flow channel 112, a red drop auxiliary flow channel liquid inlet 113 and a red drop auxiliary flow channel liquid outlet 114. The green drop quantum dot site microchannel includes: a green droplet quantum dot site 12, a green droplet auxiliary flow channel 121, a green droplet exhaust flow channel 122, a green droplet auxiliary flow channel liquid inlet 123, and a green droplet auxiliary flow channel liquid outlet 124. Further comprising: an auxiliary flow channel transmission region 13, a first RGB pixel arrangement 14, a second GRB pixel arrangement 15, a main exhaust channel 16, a first exhaust port 161, and a second exhaust port 162. Wherein the red droplet quantum dot site 11 is respectively connected with the red droplet auxiliary flow channel 111 and the red droplet exhaust flow channel 112; one end of the red droplet exhaust channel 112 is connected to the red droplet quantum dot 11, and the other end is connected to the main exhaust channel 16. The red light quantum dot solution 41 enters the red liquid drop auxiliary flow channel 111 through the liquid inlet 113 of the red liquid drop auxiliary flow channel, and under the action of pressure, the red light quantum dot solution 41 flows forwards along with the red liquid drop auxiliary flow channel 111, sequentially enters the plurality of red liquid drop quantum dot positions 11, and flows out through the liquid outlet 114 of the red liquid drop auxiliary flow channel. Each red droplet quantum dot site 11 is provided with a red droplet exhaust channel 112, so that the red droplet quantum dot solution 41 can be easily filled in all the red droplet quantum dot sites 11, and because the red droplet exhaust channel 112 has a small size relative to the red droplet auxiliary channel 111, because of a large pressure difference, the red droplet exhaust channel 112 is not easy to enter the red droplet exhaust channel 112 after the red droplet quantum dot solution 42 is filled in the red droplet quantum dot sites 11, but flows along the red droplet auxiliary channel 111 and flows out from the red droplet auxiliary channel outlet 114, and the redundant gas is transferred through the main exhaust channel 16 connected with the red droplet exhaust channel 112 and is exhausted through the first exhaust port 161 and the second exhaust port 162. The structure of the green quantum dot site micro flow channel and the direction of the green quantum dot solution 42 are completely the same as those of the red quantum dot site micro flow channel. Sequentially assigning a serial number to each quantum dot from the liquid inlet according to the sequence of injecting the quantum dot solution, wherein each quantum dot forms a liquid drop quantum dot array; the red drop quantum dot position 11 and the green drop quantum dot position 12 with the same serial number and one or two adjacent auxiliary flow channels form an auxiliary flow channel transmission area 13, and a group of RGB pixel arrangement is formed. A first RGB pixel arrangement 14 and a second GRB pixel arrangement 15 as shown in figure 3. And the auxiliary flow channel transmission area 13 is used for blue light Micro-LED backlight transmission.
The red droplet quantum dot 11 is used for converting blue light into red light, the green droplet quantum dot 12 is used for converting blue light into green light, and the auxiliary flow channel transmission area 13 is used for directly transmitting the blue light without changing the color of the blue light. One of the red drop quantum dots 11, one of the green drop quantum dots 12, and one of the auxiliary flow channel transmission regions 13 form one pixel. The micro-channel substrate 1 at least comprises one pixel point, and each pixel point comprises two circular liquid drop sub-pixel points and a blank sub-pixel point according to the three-primary-color principle. The two circular drop sub-pixel points are respectively used as a red drop quantum point 11 and a green drop quantum point 12, such as quantum dots, and then are cured to form red light quantum dots and green light quantum dots which respectively emit red light and green light when being backed with blue light. The blank sub-pixel point is used as a blue light quantum point, is a region formed by two opposite auxiliary flow channels, and allows the blue light Micro-LED to be directly transmitted as backlight.
When a plurality of pixel points exist, the pixel points are converted into circular liquid drop sub-pixel points with the same color, and the circular liquid drop sub-pixel points are mutually connected according to a liquid injection sequence through an auxiliary micro-channel structure communicated with the pixel points.
As shown in fig. 4, a method for preparing a quantum dot color conversion layer with a static droplet array to reduce optical crosstalk includes the following steps:
the method comprises the following steps: according to the arrangement of the liquid drop pixel points, a mask plate for photoetching is prepared, and then a photoresist substrate 3 containing a raised pixel array pattern is prepared by utilizing a photoetching process and is used as a template for micro-channel reverse molding. In particular, the photoresist pixel height can be determined by the spin-on photoresist speed, with the faster the speed, the thinner the photoresist.
Step two: pouring, bubble removing, curing and mold reversing sol, such as PDMS, PMMA, PI, PVA or other transparent materials, for preparing the micro-channel substrate on the photoresist substrate 3 to prepare the micro-channel substrate 1, and punching holes at the positions of the liquid inlet and the liquid outlet respectively. Then, the micro flow channel substrate 1 and the transparent substrate 2 are bonded to prepare a micro flow channel chip. Preferably, the prepared photoresist pixels are 100 microns in diameter and 20 microns in height; the transparent substrate 2 may be made of a transparent material such as PDMS, glass, quartz, acrylic, or the like. The diameter of the prepared liquid drop quantum dot is 5-500 micrometers, and the height of the prepared liquid drop quantum dot is 5-300 micrometers; the width of the exhaust channel is 1-100 microns.
Step three: and horizontally placing the bonded microfluidic chip, injecting the red quantum dot solution 41 and the green quantum dot solution 42 from corresponding liquid inlets respectively to fill the auxiliary flow channels and the liquid drop quantum dot arrays, and then flowing out from the liquid outlets. As shown in fig. 2, the pattern of the micro flow channel substrate 1 includes an exhaust channel, and the exhaust channel connects the auxiliary flow channel and the droplet generation sites, so that the quantum dot solution can easily fill the entire droplet generation sites. As shown in fig. 3, each exhaust passage is connected to the main exhaust passage 16, and the surplus gas is transferred through the main exhaust passage 16 connected to the exhaust flow passage and discharged through the first exhaust port 161 and the second exhaust port 162.
Step four: after the quantum dot solution injection is completed, the transparent sealing liquid 43 is injected from the two liquid inlets respectively, so that the transparent sealing liquid occupies the width of the whole micro flow channel, and the quantum dot solution in the auxiliary flow channel is fully discharged. Similarly, because the size of the exhaust channel is much smaller than that of the auxiliary flow channel, the sealing liquid is difficult to immerse into the liquid drop quantum dot positions due to the existence of huge pressure difference, but flows along the auxiliary flow channel, the quantum dot solution in the auxiliary flow channel is discharged, and only the quantum dot solution in the liquid drop generation dot positions is left as the liquid drop quantum dot pixel positions; preferably, the transparent sealing liquid 43 should be a transparent liquid with a relatively high viscosity, so that the transparent liquid has a relatively high adhesion with the sidewall of the flow channel, and further fully occupies the flow channel, drains the quantum dot solution in the auxiliary flow channel, and is not easy to flow into the quantum dot pixel site of the droplet; in addition, the transparent sealing liquid 43 should also be a solution with a refractive index close to that of the micro-channel substrate, because the blue light quantum dot vacancy is a region formed by two opposite auxiliary channels, when the blue light is carried on the back, if the refractive index difference between the two is too large, the blue light can form total reflection in the auxiliary channels, which causes light leakage or light crosstalk; on the contrary, if the refractive indexes of the blue quantum dot and the blue quantum dot are consistent, the blue quantum dot vacancy area can be regarded as a homogeneous material, and light cannot leak.
Step five: and fully exposing the injected micro-fluidic chip in an ultraviolet environment to cure the quantum dot pixel positions of the liquid drops, and heating the micro-fluidic chip at constant temperature to cure the transparent sealing liquid to form the quantum dot color conversion layer 4.
Step six: and aligning and bonding the quantum dot color conversion layer 4 and the blue light Micro-LED array backlight layer 5, so that the blue light Micro-LED array backlight layer 5 is respectively superposed with the red liquid drop quantum dot 11, the green liquid drop quantum dot 12 and the auxiliary flow channel transmission region 13 in the quantum dot color conversion layer, and full-color display is realized.
As shown in fig. 5, firstly, a photoresist micro-channel substrate 2 is prepared by using a photolithography technique, then a material for preparing the micro-channel is coated on the photoresist substrate 2, and a micro-channel substrate 1 is prepared by reverse molding; bonding the micro-channel substrate 1 and the transparent substrate 3 and punching to prepare a micro-fluidic chip;
then, red light quantum dot solution 41 and green light quantum dot solution 42 are respectively injected from the two liquid inlet holes to fill the whole auxiliary flow channel and the liquid drop pixel array, and then respectively flow out from the two liquid outlet holes;
then, the transparent sealing liquid 43 is injected from the two liquid inlets to drain the quantum dot solution in the auxiliary flow channel. And finally, curing the quantum dot solution in an ultraviolet environment, and then heating at constant temperature to cure the transparent sealing liquid.
As shown in fig. 6, the blue Micro-LED array backlight layer 5 includes: the LED comprises a blue light Micro-LED array substrate 51, a blue light Micro-LED array 52 and a black isolation grid 53. In particular, the black isolation gate is mainly used to reduce the optical crosstalk effect of the blue LED, including but not limited to black photoresist, black printing material, chrome plating, and the like.
Claims (9)
1. A quantum dot color conversion layer with a static droplet array to reduce optical crosstalk, the quantum dot color conversion layer comprising: the transparent substrate and the micro-channel substrate are connected in a bonding manner; the micro flow channel substrate includes: the quantum dot micro-flow channels are of the same structure, do not intersect with each other and are distributed in a snake shape; each quantum dot position micro flow channel comprises: the auxiliary flow channel, the liquid drop generating point and the exhaust channel; the quantum dot solution circulating in the auxiliary flow channel sequentially enters the plurality of liquid drop generating point positions and is exhausted through an exhaust channel connected with the liquid drop generating point positions; the quantum dot solutions in the two quantum dot position micro flow channels with the same structure are respectively a red quantum dot solution and a green quantum dot solution.
2. The quantum dot color conversion layer for reducing optical crosstalk according to claim 1, wherein the droplet generation sites form a droplet quantum dot array, and two droplet generation sites with the same order and one or two adjacent auxiliary flow channels form an auxiliary flow channel transmission region to form a set of RGB pixel arrangements.
3. The quantum dot color conversion layer for reducing optical crosstalk according to claim 1, wherein the two quantum dot microchannels comprise at least one set of RGB pixel arrangements.
4. The quantum dot color conversion layer for reducing optical crosstalk according to claim 1, wherein each of the auxiliary flow channels is provided with a liquid inlet and a liquid outlet.
5. The quantum dot color conversion layer for reducing optical crosstalk according to claim 1, wherein the other end of the exhaust channel is connected to the auxiliary flow channel.
6. The quantum dot color conversion layer for reducing optical crosstalk according to claim 1, further comprising a main exhaust channel, wherein the main exhaust channel is located between the two quantum dot micro channels with the same structure, and the other end of the exhaust channel is connected to the main exhaust channel.
7. The method for preparing a quantum dot color conversion layer with reduced optical crosstalk based on the static droplet array of any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: preparing a photoresist substrate containing a raised pixel array pattern by utilizing a photoetching process according to the arrangement of the liquid drop generating points, wherein the photoresist substrate is used as a template for micro-channel reverse molding;
step two: pouring, bubble removing, curing and reverse molding the sol for preparing the micro-channel substrate on a photoetching glue base plate to prepare the micro-channel substrate, and punching holes at the positions of the liquid inlet and the liquid outlet; bonding the micro-channel substrate and the transparent substrate to prepare a micro-fluidic chip;
step three: horizontally placing the bonded microfluidic chip, respectively injecting a red quantum dot solution and a green quantum dot solution from corresponding liquid inlet holes to fill the auxiliary flow channel and the liquid drop quantum dot array, and then flowing out from the liquid outlet holes, and discharging redundant air through an exhaust channel;
step four: after the quantum dot solution is injected, transparent sealing liquid is respectively injected from the two liquid inlets to occupy the auxiliary flow channel, and the quantum dot solution in the auxiliary flow channel is fully discharged;
step five: fully exposing the microfluidic chip after the step four to an ultraviolet environment, solidifying the quantum dot pixel positions of the liquid drops, heating the microfluidic chip at constant temperature, and solidifying the transparent sealing liquid to form a quantum dot color conversion layer;
step six: and aligning and bonding the quantum dot color conversion layer and the blue light Micro-LED to realize full-color display.
8. The method according to claim 7, wherein the transparent substrate is made of PDMS, glass, quartz, acrylic plate material; the micro-channel substrate is made of PDMS, PMMA, PI and PVA materials.
9. The method according to claim 7, wherein the transparent sealant has a refractive index of 1.4 to 1.41, a viscosity of 350cs, and a refractive index of 1.406.
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