LIGHT EMITTING DIODE AND METHOD FOR FABRICATING THE SAME

摘要

A light emitting diode and a method for fabricating the same are provided. The light emitting diode includes: a transparent substrate; a semiconductor material layer formed on the top surface of a substrate with an active layer generating light; and a fluorescent layer formed on the back surface of the substrate with controlled varied thicknesses. The ratio of light whose wavelength is shifted while propagating through the fluorescent layer and the original light generated in the active layer can be controlled by adjusting the thickness of the fluorescent layer, to emit desirable homogeneous white light from the light emitting diode.

主权项

1. A method for fabricating a light emitting diode, the method comprising:
preparing a light transmitting substrate having a top surface, a back surface opposite to the top surface and a side surface between the top surface and the back surface; forming a semiconductor material layer having a first compound semiconductor layer, an active layer generating a first light and a second compound semiconductor layer on the top surface of the light transmitting substrate; forming at least one recess in a back surface of the light transmitting substrate, the area of the back surface adjacent the recess being substantially flat; and forming a wavelength converting layer on the back surface of the light transmitting substrate such that the wavelength converting layer is disposed on the flat area of the back surface and in the at least one recess, the wavelength converting layer converting a portion of the first light to a second light having a different wavelength from the first light.