Silicon Light Emitting Diodes and Lasers : Photon Breeding Devices using Dressed Photons Problems of Semiconductor Light Emitting Devices Solutions by Silicon and Dressed Photons Dressed Photons and Dressed Photon Phonons Principles of Light Emission and Photon Breeding Light Emitting Diodes Strength of Photon Coupling Contribution of the Multimode Phonons Lasers Light Emitting Devices Fabricated from Other Crystals Other Devices. This book focuses on a novel phenomenon named photon breeding. It is applied to realizing light emitting diodes and lasers made of indirect transition type silicon bulk crystals in which the light emission principle is based on dressed photons. After presenting physical pictures of dressed photons and dressed photon phonons the principle of light emission by using dressed photon phonons is reviewed. A novel phenomenon named photon breeding is also reviewed. Next the fabrication and operation of light emitting diodes and lasers are described The role of coherent phonons in these devices is discussed. Finally light emitting diodes using other relevant crystals are described and other relevant devices are also reviewed.