Optical rotation film, preparation method thereof and photoelectric device

A technology of photoelectric devices and optical films, applied in the field of optical films, can solve problems such as insufficient rigidity, changing polarized light, and increasing the number of replacements of polarizing films, etc.

Pending Publication Date: 2021-10-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is not enough to just solve the rigidity problem
[0003] On the other hand, the angle at which the polarization plane can be rotated by the polarizing film on the market is often fixed, and the polarization plane of polarized light cannot be changed at multiple angles or cycles.
This will increase the replacement frequency of the polarizing film

Method used

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  • Optical rotation film, preparation method thereof and photoelectric device
  • Optical rotation film, preparation method thereof and photoelectric device
  • Optical rotation film, preparation method thereof and photoelectric device

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preparation example Construction

[0039] The present invention also provides a method for preparing the above-mentioned optically active film, including:

[0040] S1, providing a solution containing polyurethane, the polyurethane includes a soft segment and a hard segment, and the soft segment is composed of molecular chains formed by chiral polypolyols;

[0041] S2. Provide a substrate, place the solution on the substrate, and form an optically active film.

[0042] In step S1, the solvent of the solution includes at least one of dichloroethane, trichloroethane, tetrachloroethane, tetrahydrofuran, and N,N-dimethylformamide, preferably trichloroethane. The mass ratio of the polyurethane to the solvent is 1:5˜1:10, preferably 1:8 in order to make the forming process of the optically active film more perfect.

[0043] In step S2, the substrate is preferably a single crystal silicon wafer, the forming temperature is 0° C. to 60° C., the forming time is 24 hours to 72 hours, and different processing temperatures ...

Embodiment 1

[0048] Polyurethane and trichloroethane are configured into a solution at a mass ratio of 1:5. Among them, polyurethane is obtained by copolymerization of L-polylactic acid polyol, polytetrahydrofuran polyol, 1,4-butanediol, and 4,4'-dicyclohexylmethane diisocyanate, with a number average molecular weight of 30,000 g / mol, including soft segments and hard segments. segment, wherein the structural unit of L-polylactic acid polyol accounts for 20% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:6.

[0049] Put the above solution on a single crystal silicon wafer and mold it at 5°C for 54 hours to obtain an optically active film with a thickness of 0.1mm. When the strain range of the optically active film is 0-10%, it can make the polarized light in the range of 0-360° It changes periodically, and the polarized light passing through the optical film can be reduced from the strongest light intensity to zero.

Embodiment 2

[0051] Polyurethane and trichloroethane are configured into a solution at a mass ratio of 1:7. Among them, polyurethane is obtained by copolymerization of L-polylactic acid polyol, polytetrahydrofuran polyol, 1,4-butanediol, and 4,4'-dicyclohexylmethane diisocyanate, with a number average molecular weight of 28000g / mol, including soft segments and hard segments. segment, wherein the structural unit of L-polylactic acid polyol accounts for 30% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:7.

[0052] Place the above solution on a single crystal silicon wafer, and mold it at 5°C for 54 hours to obtain an optically active film with a thickness of 0.15mm. It changes periodically, and the polarized light passing through the optical film can be reduced from the strongest light intensity to zero.

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Abstract

The invention relates to an optical rotation film. The optical rotation film is made of polyurethane, the polyurethane comprises a soft segment and a hard segment, and the soft segment is composed of a molecular chain formed by chiral polyalcohol. According to the optical rotation film, the polarization direction of linear polarized light can be controlled through strain, the adjusting range of the direction is 0-360 degrees, the polarized light penetrating through the optical rotation film can be reduced to 0 from the strongest light intensity so that brightness changes can be achieved in a photoelectric device, and in the dynamic stretching process, the changes can be periodically repeated. The invention also relates to a preparation method of the optical rotation film and a photoelectric device using the optical rotation film.

Description

technical field [0001] The invention relates to an optical film, in particular to an optical active film, a preparation method thereof, and a photoelectric device. Background technique [0002] Polarized light is widely used in daily life, such as well-known cancer diagnosis and treatment technology; 3D movie imaging technology; sky navigation technology, etc. In these applications, a material that can rotate the polarization plane of polarized light is often required. This material is Polarizing material, the commonly used polarizing material is polarizing film, as the name implies, polarizing film can change the polarization plane of polarized light, but most polarizing films at this stage have two relatively large defects. First, most polarizing films are made of inorganic composite materials , this material tends to be relatively hard, has a relatively high modulus, and lacks flexibility, which limits its application in bendable devices. Therefore, the advantages of org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 王凯张若愚朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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