A kind of blue phase liquid crystal film and its preparation method and use

Abstract

The invention discloses a blue phase liquid crystal film, and a preparation method and an application thereof. The blue phase liquid crystal film comprises the following components: 30 wt% of polymerizable liquid crystal monomer C6M, 59.5 wt% of liquid crystal molecules HTG135200-100, 2.9-3.7 wt% of a chiral dopant, 5 wt% of a crosslinking agent, 0.2-2 wt% of a photoinitiator, and 0.5-2 wt% of a small molecule dye. Since the blue phase state is affected by the polymerizable liquid crystal monomer C6M, the blue phase liquid crystal film prepared by adopting the preparation method is in a solidstate, and its morphology is relatively stable, so that the blue phase can be maintained in a very wide temperature range. Further, the influence of the thermal effect caused by the pump light on thetemperature of a liquid crystal laser device cannot affect the phase state of the blue phase liquid crystal, thus the wavelength stability of the laser device is greatly improved when the blue phase liquid crystal film is used as the laser device.

Description

technical field [0001] The invention relates to the technical field of organic dye lasers, in particular to a blue phase liquid crystal film and its preparation method and application. Background technique [0002] The existing blue-phase liquid crystal lasers generally have the following disadvantages: [0003] (1) Due to the narrow temperature range of the blue phase, the general operating temperature is 0.5-2°C. When the external environment temperature changes, the phase of the liquid crystal will change from the blue phase to the cholesteric or isotropic phase. , resulting in limited use of temperature. [0004] (2) The existing blue-phase laser is in liquid state, and the selective reflection produced by the band gap of the blue-phase state changes with the temperature. In the BPI state, it blue shifts with the increase of temperature. , the band gap red shifts with the increase of temperature, so when the laser is heated up when it is externally excited, the lasing ...

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Problems solved by technology

[0003] (1) Due to the narrow temperature range of the blue phase, the general operating temperature is 0.5-2°C. When the external environment temperature changes, the phase of the liquid crystal will change from the blue phase to the cholesteric or isotropic phase. , resulting in limited use of temperature

[0004] (2) The existing blue-phase laser is in liquid state, and the selective reflection produced by the band gap of the blue-phase state changes with the temperature. In the BPI state, it blue shifts with the increase of temperature. , the band gap red shifts with the increase of temperature, so when the laser is heated up when it is externally excited, the lasing wavelength of the laser changes with the temperature, and the wavelength stability is poor

[0005] (3) Since the existing blue-phase liquid crystal is liquid and has a certain degree of fluidity, the periodic dielectric structure of the blue-phase liquid crystal is unstable, resulting in defects such as high threshold and low Q value

[0006] (4) Since the existing blue-phase liquid crystal lasers are all installed in the liquid crystal cell, the size of the laser is limited by the size of the liquid crystal cell, and the flexibility is poor, which greatly limits the flexibility of the laser.

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