A light-emitting device includes a substrate with a top surface; a first light-emitting structure unit and a second light-emitting structure unit separately formed on the top surface and adjacent to each other, and wherein the first light-emitting structure unit includes a first sidewall and the second light-emitting structure unit includes a second sidewall; an isolation layer formed on the first sidewall and the second sidewall, including a first edge on the first light-emitting structure unit and wherein the first edge has an acute angle in a cross-sectional view; and an electrical connection formed on the isolation layer, the first light-emitting structure unit and the second light-emitting structure unit, and electrically connecting the first light-emitting structure unit and the second light-emitting structure unit; wherein the first sidewall and the second sidewall are inclined; and wherein the electrical connection includes a first part on the first light-emitting structure unit, and the first part does not overlap the first edge of the isolation layer.