Abstract: A composition for manufacturing a light-emitting device includes: a solvent; and a first compound and a second compound, each dispersed in the solvent; wherein a molecular weight of the first compound is 750 g/mol or less, a molecular weight of the second compound is greater than 750 g/mol, a lowest unoccupied molecular orbital (LUMO) energy level of the second compound is greater than ?2.4 eV, a highest occupied molecular orbital (HOMO) energy level of the second compound is less than ?5.6 eV, and a bandgap energy of the second compound is greater than 3.2 eV.

Abstract: A composition for manufacturing a light-emitting device includes: a solvent; and a first compound and a second compound, each dispersed in the solvent; wherein a molecular weight of the first compound is 750 g/mol or less, a molecular weight of the second compound is greater than 750 g/mol, a lowest unoccupied molecular orbital (LUMO) energy level of the second compound is greater than ?2.4 eV, a highest occupied molecular orbital (HOMO) energy level of the second compound is less than ?5.6 eV, and a bandgap energy of the second compound is greater than 3.2 eV.

Abstract: An ink composition for a light-emitting device includes a phosphine oxide-based charge transporting organic material, a first solvent represented by Formula 1, a second solvent represented by Formula 2, and a third solvent that is polar aprotic. A light-emitting device includes a layer prepared with the in composition.

Abstract: A composition for manufacturing a light-emitting device includes: a solvent; and a first compound and a second compound, each dispersed in the solvent; wherein a molecular weight of the first compound is 750 g/mol or less, a molecular weight of the second compound is greater than 750 g/mol, a lowest unoccupied molecular orbital (LUMO) energy level of the second compound is greater than ?2.4 eV, a highest occupied molecular orbital (HOMO) energy level of the second compound is less than ?5.6 eV, and a bandgap energy of the second compound is greater than 3.2 eV.

Abstract: An ink composition for forming an electron transport layer of a light-emitting device of a display device includes: an electron-transporting compound including a phosphine oxide moiety; and a solvent represented by Formula 1, (P?O)(OR1)(OR2)(OR3)??Formula 1 wherein, in Formula 1, R1 to R3 each, independently from one another, are hydrogen, deuterium, or a C1-C30 alkyl group, and at least one of R1 to R3 is a C1-C30 alkyl group.

Abstract: An ink composition for a light-emitting device includes: a phosphine oxide-based charge transport organic material; a first solvent represented by Formula 1; and a second solvent represented by Formula 2: HOR1(O)mR2OH??Formula 1 (HO)aR11O(R12O)nR13(OH)b.

Abstract: A parking management system including a rail is described. A camera module takes images of a parking area, has a chargeable battery, and moves along the rail using a motor and wheels. A charging and AP module charges the camera module, receives image information from the camera module, and is movable using a motor, a running rail and gears. A server processes the image information received from the charging and AP module. A computer is connected to the server, and contains management software which executes a parking situation search using a database of the server. The camera takes images from the parking area while moving along the rail, and is positioned on the charging rail so as to be charged from the charging and AP module.

Abstract: A parking management system including a rail is described. A camera module takes images of a parking area, has a chargeable battery, and moves along the rail using a motor and wheels. A charging and AP module charges the camera module, receives image information from the camera module, and is movable using a motor, a running rail and gears. A server processes the image information received from the charging and AP module. A computer is connected to the server, and contains management software which executes a parking situation search using a database of the server. The camera takes images from the parking area while moving along the rail, and is positioned on the charging rail so as to be charged from the charging and AP module.