Patent ID: 11923475
Assignee: S.V.V. TECHNOLOGY INNOVATIONS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A method of making a light converting optical system, comprising:
providing a first optical layer having a first microstructured broad-area front surface and at least two edges, the first microstructured broad-area front surface comprising an array of linear grooves disposed side by side and extending along a straight line between the two edges, each of the linear grooves having a triangular cross section and being configured to reflect first light rays having first incidence angles with respect to a surface normal using a total internal reflection and deflect second light rays having second incidence angles with respect to the surface normal using refraction;
providing a thin sheet of reflective light scattering material approximately coextensive with the first optical layer;
positioning the thin sheet of reflective light scattering material parallel to the first optical layer;
providing a light source configured to emit light in a visible spectrum;
providing a second optical layer approximately coextensive with the first optical layer and having a second microstructured broad-area front surface;
providing a continuous broad-area photoabsorptive film layer approximately coextensive with the first optical layer and having an active layer comprising a first light converting semiconductor material having a first bandgap and a second light converting semiconductor material having a second bandgap which is different than the first bandgap,
wherein each of the first and second light converting semiconductor materials is configured to absorb light selectively such that photons with a higher energy are at least partially absorbed and converted into charge carriers and photons with a lower energy are transmitted, and wherein a thickness of the active layer is less than a minimum thickness sufficient for absorbing substantially all light in the visible spectrum traversing through the continuous broad-area photoabsorptive film layer;
positioning the continuous broad-area photoabsorptive film layer between and parallel to the first optical layer and the thin sheet of reflective material; and
positioning the second optical layer on a light path between the light source and the continuous broad-area photoabsorptive film layer.