Patent ID: 7872442

Claim:
A power source for charging a battery within a portable electronic device having a housing, the power source comprising: a photovoltaic apparatus for charging the battery, the photovoltaic apparatus disposed within the housing, wherein the housing supports the photovoltaic apparatus and comprises a transparent material to pass light to the apparatus; a fluorescent species embedded on the transparent material providing a combined layer, the fluorescent species collecting a broad spectrum of light and down converting the broad spectrum of light into light having a narrow range of wavelengths, and the combined layer obscuring the photovoltaic apparatus such that the presence of the photovoltaic apparatus does not affect the overall appearance of the electronic device, the combined layer disposed in the housing to pass the narrow range of wavelengths to the photovoltaic apparatus; and a refractive index layer disposed between the photovoltaic apparatus and the combined layer that improves light transmission to the photovoltaic apparatus, wherein a refractive index of the refractive index layer matches a refractive index of the housing.