Liquid crystal composition and liquid crystal display device thereof
A liquid crystal composition and a liquid crystal display device including the liquid crystal composition include at least one compound of general formula I and at least one compound of general formula II. Compared with the prior art, the liquid crystal composition has a smaller voltage change rate at high and low temperatures and a shorter low temperature response time, while maintaining an appropriate optical anisotropy, an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, such that the liquid crystal display device having the liquid crystal composition has a better display and a faster response speed.
1. A liquid crystal composition, wherein the liquid crystal composition comprises:
at least one compound of general formula I
at least one compound of general formulas II-1, II-2, II-5, II-6, II-7, and II-11 selected from the group consisting of:
at least one compound of general formula III-1
in which,
R 1 represents —H;
R 2 represents —H, halogen, C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or more —H in
can each be independently substituted by —F or —Cl;
R 3 and R 4 each independently represents C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
ring
represents
wherein one or more —CH 2 — in
can be replaced by —O—, and one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
in the ring
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring
can be replaced by —N═;
ring
represents
wherein one or more —CH 2 — in and
can be replaced by —O—, and one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
in the ring
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring
can be replaced by —N═;
X 1 represents —O—, —S—, —CO—, —CF 2 —, —NH— or —NF—;
Y 1 and Y 2 each independently represents —H, halogen, C 1-3 halogenated or unhalogenated alkyl, or C 1-3 halogenated or unhalogenated alkoxy;
Z 1 represents —O—, —S—, —CO—O—, —O—CO—, —OCH 2 —, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —CF 2 CF 2 —, —(CH 2 ) 4 —, —CF 2 O— or —OCF 2 —, and Z 2 represents single bond, —O—, —S—, —CO—O—, —O—CO—, —CH 2 O—, —OCH 2 —, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —CF 2 CF 2 —, —(CH 2 ) 4 —, —CF 2 O— or —OCF 2 —;
T 1 , T 2 , T 4 , T 5 , T 6 , and T 8 each independently represents —H, —F, —Cl, —CN, —CH 3 or —OCH 3 ;
R 5 and R 6 each independently represents C 1-10 linear alkyl or C 3-10 branched alkyl,
C 1-9 linear alkyl or C 3-9 branched alkoxy, or C 2-10 linear alkyl or C 3-10 branched alkenyl; and
n 1 represents 1 or 2, n 2 represents 0, 1 or 2, wherein when n 1 =2, ring
can be same or different, and Z 1 can be same or different; wherein when n 2 =2, ring
can be same or different, and Z 2 can be same or different.
2. The liquid crystal composition according to claim 1 , wherein the compound of general formula I is selected from a group consisting of the following compounds:
in which,
ring
represents
wherein one or more —CH 2 — in
can be replaced by —O—, and one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
in the ring
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring
can be replaced by —N═;
Z 1 ′ represents —O—, —S—, —CO—O—, —O—CO—, —OCH 2 —, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —CF 2 CF 2 —, —(CH 2 ) 4 —, —CF 2 O— or —OCF 2 —; and
X 1 represents —O—, —S— or —CO—.
3. The liquid crystal composition according to claim 1 , further comprising a compound selected from a group consisting
wherein R 3 and R 4 each independently represents C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—.
4. The liquid crystal composition according to claim 1 , wherein the compound of general formula I provides 0.1-40 wt. % of the total weight of the liquid crystal composition; and the compound of general formulas II-1, II-2, II-5, II-6, II-7, and II-11 provides 0.1-70 wt. % of the total weight of the liquid crystal composition.
5. The liquid crystal composition according to claim 1 ,
wherein the liquid crystal composition further comprises at least one compound of general formula III-2:
in which,
T 9 , T 10 and T 11 each independently represents —H, —F, —Cl, —CN, —CH 3 or —OCH 3 ; and
X 2 represents —F, —CF 3 , —OCF 3 or —CH 2 CH 2 CH═CF 2 .
6. The liquid crystal composition according to claim 5 , wherein the compounds of general formulas III-1 and III-2 provide 0.1-50 wt. % of the total weight of the liquid crystal composition.
7. The liquid crystal composition according to claim 1 , wherein the liquid crystal composition further comprises at least one compound of general formula M:
in which,
R M1 and R M2 each independently represents C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 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 more —CH 2 — on
in the rings
can be replaced by —O—, one or more single bond in the ring can be replaced by double bond, wherein at most one —H on
in the rings
can be substituted by halogen;
Z M1 and Z M2 each independently represents single bond, —CO—O—, —O—CO—, —CH 2 O—, —OCH 2 —, —C≡C—, —CH═CH—, —CH 2 CH 2 — or —(CH 2 ) 4 —; and
n M represents 0, 1 or 2, wherein when n M =2, ring
can be same or different, Z M2 can be same or different; and
when n M =1 or 2, at least one of ring
ring
and ring
is non-aromatic ring.
8. The liquid crystal composition according to claim 1 , wherein the liquid crystal composition further comprises at least one compound of general formula N:
in which,
R N1 and R N2 each independently represents C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
ring
and ring
each independently represents or
wherein one or more —CH 2 — on
in the rings
and
can be replaced by —O—, and one or more single bond in the ring can be replaced by double bond, wherein one or more —H on
in the rings
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring can be replaced by —N═;
Z N1 and Z N2 each independently represents single bond, —CO—O—, —O—CO—, —CH 2 O—, —OCH 2 —, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —CF 2 CF 2 —, —(CH 2 ) 4 —, —CF 2 O— or —OCF 2 —;
L N1 and L N2 each independently represents —H, C 1-3 alkyl or halogen;
n N1 represents 0, 1, 2 or 3, n N2 represents 0 or 1, and 0≤n N1 +n N2 ≤3, wherein when n N1 =2 N 1 or 3, ring
can be same or different, Z N1 can be same or different;
when 0≤n N1 +n N2 ≤2, compounds of general formula N do not comprise terphenyl structure; and
when n N1 +n N2 =3, compounds of general formula N do not comprise quaterphenyl structure.
9. A liquid crystal display device comprising the liquid crystal composition of claim 1 .
10. A liquid crystal composition, wherein the liquid crystal composition comprises:
at least one compound of general formula I
at least one compound of general formulas II-1, II-2, II-5, II-6, II-7, and II-11 selected from the group consisting of:
at least one compound of general formula III-1
in which,
R 1 represents —H;
R 2 represents —H, halogen, C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or more —H in
can each be independently substituted by —F or —Cl;
R 3 and R 4 each independently represents C 1-12 linear alkyl or C 3-12 branched alkyl,
wherein one or more nonadjacent —CH 2 — in the C 1-12 linear alkyl or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
ring
represents
wherein one or more —CH 2 — in
can be replaced by —O—, and one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
in the ring
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring
can be replaced by —N═;
ring
represent
wherein one or more —CH 2 — in
can be replaced by —O—, and one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
in the ring
can each be independently substituted by —F, —Cl, —CN, —CH 3 or —OCH 3 , and one or more —CH═ in the ring
can be replaced by —N═;
X 1 represents —O—, —S—, —CO—, —CF 2 —, —NH— or —NF—;
Y 1 and Y 2 each independently represents —H, halogen, C 1-3 halogenated or unhalogenated alkyl, or C 1-3 halogenated or unhalogenated alkoxy;
Z 1 and Z 2 each independently represents single bond, —O—, —S—, —CO—O—, —O—CO—, —CH 2 O—, —OCH 2 —, —CH═CH—, —C≡C—, —CH 2 CH 2 —, —CF 2 CF 2 —, —(CH 2 ) 4 —, —CF 2 O— or —OCF 2 —;
T 1 , T 2 , T 4 , T 5 , T 6 , and T 8 each independently represents —H, —F, —Cl, —CN, —CH 3 or —OCH 3 ;
R 5 and R 6 each independently represents C 1-10 linear alkyl or C 3-10 branched alkyl,
C 1-9 linear alkyl or C 3-9 branched alkoxy, or C 2-10 linear alkyl or C 3-10 branched alkenyl; and
n 1 represents 1 or 2, n 2 represents 1 or 2, wherein when n 1 =2, ring
can be same or different, and Z 1 can be same or different; wherein when n 2 =2, ring
can be same or different, and Z 2 can be same or different.