Patent ID: 7242030

Claim:
A quantum dot/quantum well light emitting diode (LED), comprising: a substrate having a first surface and a second surface; a LED structure disposed on the first surface of the substrate, the LED structure having a N-type doped nitride layer formed on the first surface, a P-type doped nitride layer and a first light emitting layer sandwiched between these two nitride layers; a second light emitting layer disposed on the second surface; and a third light emitting layer disposed on the second light emitting layer; wherein, once a proper forward bias is applied to the N-type doped nitride layer and the P-type doped nitride layer, the first light emitting layer is excited to emit a first light output, while a portion of the first light is used to excite the second light emitting layer and the third light emitting layer respectively to generate a second light and a third light output; the second light can also be used to excite the third light emitting layer, and the light output of a desired color is generated by mixing the first light, the second light and the third light.