Liquid crystal composition and liquid crystal display device

A liquid crystal composition comprising at least one compound of general formula I-1 and at least one compound selected from general formula II-1 and general formula II-2:

• wherein, R1 represents —H, C1-12 halogenated or unhalogenated linear alkyl, C3-12 halogenated or unhalogenated branched alkyl, C1-12 halogenated or unhalogenated alkoxy, C2-12 halogenated or unhalogenated alkenyl, C2-12 halogenated or unhalogenated alkenoxy,
• R21 and R32 each independently represents C1-12 alkyl, C1-12 alkoxy, C2-12 alkenyl, or C2-12 alkenoxy;
• R22 represents halogen atom, C1-5 halogenated alkyl, C1-5 halogenated alkoxy, C2-5 halogenated alkenyl, or C2-5 halogenated alkenoxy;
• R31 represents —H, C1-12 alkyl, or C1-12 alkoxy;
• ring
• represents
• ring
• ring
• ring
• and ring
• each independently represents
• one or at least two —CH2— in
• can be replaced by —O—, one or at least two single bond in the rings can be replaced by double bond, and at least one single bond in the rings in at least one of ring
• and ring
• is replaced by double bond, at least one single bond in the rings in at least one of ring
• and ring
• is replaced by double bond;
• L1 and L2 represent fluorine atom;
• X1 represents —O—;
• X2 represents —O— or —S—;
• n2 represents 0, 1, 2, 3 or 4;
• percentage by weight of the compound of general formula I-1 is 0.1%-20%;
• percentage by weight of the compound of general formula II-1 is 0.1%-20%;
• percentage by weight of the compound of general formula II-2 is 0.1%-20%;
• the liquid crystal composition further comprises at least one compound of general formula III:
• wherein, R2 represents C1-12 linear alkyl, C3-12 branched alkyl,
• wherein one or at least two nonadjacent —CH2— in the C1-12 linear alkyl, C3-12 branched alkyl,
• can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or at least two-H in the C1-12 linear alkyl and C3-12 branched alkyl can each be independently replaced by —F or —Cl;
• Z2 represents single bond, —CH2CH2—, —CF2CF2—, —CO—O—, —O—CO—, —O—CO—O—, —CH═CH—, —CF═CF—, —CH2O— or —OCH2—;
• X3 represents —O— or —CH2—;
• X4 represents —F or —H;
• and
• X5 represents halogen atom, C1-5 halogenated alkyl, C1-5 halogenated alkoxy, C2-5 halogenated alkenyl, or C2-5 halogenated alkenoxy;
• percentage by weight of the compound of general formula III is 0.1%-20%;
• the liquid crystal composition further comprises a group of compounds consisting of at least one compound of general formula A-1 and at least one compound of general formula A-2:
• wherein, RA1 and RA2 each independently represents C1-12 linear alkyl, C3-12 branched alkyl,
• wherein, one or at least two nonadjacent —CH2— in the C1-12 linear alkyl, C3-12 branched alkyl,
• can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or at least two-H in the C1-12 linear alkyl and C3-12 branched alkyl can each be independently replaced by —F or —Cl;
• ring
• represents
• wherein one or at least two —CH2— in
• can be replaced by —O—;
• one or at least two single bond in the rings in
• can be replaced by double bond;
• one or at least two —H on
• can each be independently replaced by —F, —Cl or —CN, one or at least two —CH═ in the rings can be replaced by —N═;
• ring
• represents
• wherein one or at least two —CH2— in
• can be replaced by —O—, one or at least two single bond in the rings can be replaced by double bond;
• one or at least two —H on
• can each be independently replaced by —F, —Cl or —CN, one or at least two —CH═ in the rings can be replaced by —N═;
• ring
• each independently represents
• wherein one or at least two —CH2— in
• can be replaced by —O—, one or at least two single bond in the rings in
• can be replaced by double bond;
• one or at least two —H on
• can each be independently replaced by —F, —Cl or —CN, one or at least two —CH═ in the rings can be replaced by —N═;
• ZA11, ZA21 and ZA22 each independently represents single bond, —CH2CH2—, —CF2CF2—, —CO—O—, —O—CO—, —O—CO—O—, —CH—CH—, —CF═CF—, —CH2O— or —OCH2—;
• LA11, LA12, LA13, LA21 and LA22 each independently represents —H, C1-3 alkyl, or halogen atom;
• XA1 and XA2 each independently represents halogen atom, C1-5 halogenated alkyl, C1-5 halogenated alkoxy, C2-5 halogenated alkenyl or C2-5 halogenated alkenoxy;
• nA11 represents 0, 1, 2 or 3, wherein when nA11 represents 2 or 3, ring
• can be the same or different, and ZA11 can be the same or different;
• nA12 represents 1 or 2, wherein when nA12 represents 2, ring
• can be the same or different;
• and
• nA2 represents 0, 1, 2 or 3, wherein when nA2 represents 2 or 3, ring
• can be the same or different, and ZA21 can be the same or different;
• percentage by weight of the compound of general formula A-1 is 0.1%-20%;
• in the liquid crystal composition, percentage by weight of the compound of general formula A-2 is 0.1%-20%;
• the liquid crystal composition further comprises at least one compound of general formula M:
• wherein, RM1 and RM2 each independently represents C1-12 linear alkyl, C3-12 branched alkyl,
• wherein one or at least two nonadjacent —CH2— in the C1-12 linear alkyl and C3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
• ring
• ring
• and ring
• each independently represents
• wherein one or at least two —CH2— in
• can be replaced by —O—;
• at most one —H on
• can be replaced by halogen atom;
• ZM1 and ZM2 each independently represents single bond, —CO—O—, —O—CO—, —CH2O—, —OCH2—, —C≡C—, —CH═CH—, —CH2CH2— or —(CH2)4—;
• and
• nM represents 0, 1 or 2, wherein when nM represents 2, ring
• can be the same or different, ZM2 can be the same or different;
• in the liquid crystal composition, percentage by weight of the compound of general formula Mis 20%-80%.