1. A light emitting device, comprising:light emitting elements comprising light emitting top surfaces, and
a pre-formed wavelength conversion element including a sheet of wavelength conversion material attached to the light emitting top surfaces of the light emitting elements, the sheet comprising:
a light extraction top surface, and
at least one reflective side surface that is neither orthogonal nor parallel to the light extraction top surface, the reflective side surface being at a location between at least two light emitting elements, the reflective side surface comprising a lower edge along a perimeter of a light emitting top surface of one of the at least two light emitting elements.