This application describes an assembly suitable for emitting light, and methods of forming the same. The assembly includes a single crystal substrate with first and second surfaces, a plurality of LEDs in immediate contact with the first surface of the substrate. The LEDs are substantially crystal lattice matched with the substrate. The plurality of LEDs includes three or more LEDs that are not in electrical contact with any other LED, and there is a gap between each LED of the plurality and its nearest neighbor LED. The assembly includes phosphor-containing encapsulant layers overlying at least a portion of the LEDs.