Liquid crystalline medium and electro-optical device

A liquid crystalline medium comprising 80% by weight or more of one or more compounds selected from the group of compounds of formulae IA, IB and IC,

• in which
• X1A, X1B and X1C independently of each other denote —F, —OCF3, —Cl, —NCS, or —CN,
• Z1A, Z1B and Z1C independently of each other denote —(C═O)—O— or —CF2—O—,
• L1A, L1B and L1C independently of each other denote H or CH3,
• A1A denotes
• A1B denotes
• A1C denotes
• R1A, R1B and R1C independently of one another denote an alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups may in each case be replaced, independently of one another, by —C═C—, —CF2O—, —OCF2—, —CH═CH—,
• —O—, —S—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen, or denotes H.