NOVELTY - Forming a solar module (300), comprises: (a) providing a first assembly of layers comprising a first substrate layer, a first reflector adjacent to the first substrate layer, and a first coating adjacent to the first reflector, (b) providing a second assembly of layers comprising a second substrate layer, a second reflector adjacent to the second substrate layer, and a second coating adjacent to the second reflector, (c) positioning the first assembly of layers and the second assembly of layers, and (d) bonding the first coating and the second coating to form a luminescent layer.    USE - The method is useful for forming a solar module (claimed), which is useful to convert energy from solar radiation into electricity.    ADVANTAGE - The method allows easy fabrication of a solar module with high photoconversion efficiency, high quantum efficiency and improved photoluminescence. The solar module has good ability to efficiently convert incident solar radiation into useful electrical energy without transmission and depletion loss, and avoids or reduces the detrimental impact on its original characteristics.    DETAILED DESCRIPTION - Forming a solar module (300), comprises: (a) providing a first assembly of layers comprising a first substrate layer, a first reflector adjacent to the first substrate layer, and a first coating adjacent to the first reflector, where the first coating corresponds to a luminescent material and includes a first surface facing away from the first reflector, (b) providing a second assembly of layers comprising a second substrate layer, a second reflector adjacent to the second substrate layer, and a second coating adjacent to the second reflector, where the second coating corresponds to the luminescent material and includes a second surface facing away from the second reflector, (c) positioning the first assembly of layers and the second assembly of layers such that the first surface of the first coating and the second surface of the second coating face one another, and (d) bonding the first coating and the second coating to form a luminescent layer, the luminescent layer including the luminescent material and positioned between the first reflector and the second reflector; or (i) providing a first assembly of layers comprising a first substrate layer, a first reflector adjacent to the first substrate layer, and a luminescent layer adjacent to the first reflector, where the luminescent layer includes a first surface facing away from the first reflector, (ii) providing a second assembly of layers comprising a second substrate layer and a second reflector adjacent to the second substrate layer, where the second reflector includes a second surface facing away from the second substrate layer, (iii) applying an adhesive material adjacent to at least one of the first surface of the luminescent layer and the second surface of the second reflector, (iv) positioning the first assembly of layers and the second assembly of layers such that the adhesive material is between the luminescent layer and the second reflector, and (v) applying energy to the adhesive material to form a bonding layer connecting the luminescent layer and the second reflector. An INDEPENDENT CLAIM is included for the solar module comprising: a set of photovoltaic cells (302); and a spectral concentrator (306) optically connected to the set of photovoltaic cells and includes a luminescent stack comprising a first reflector, a second reflector, a luminescent layer positioned between the first reflector and the second reflector, the luminescent layer configured to absorb incident solar radiation and emit substantially monochromatic radiation that is guided towards the set of photovoltaic cells, and a bonding layer positioned between the luminescent layer and the second reflector, where the bonding layer is formed from an adhesive material and connects the luminescent layer and the second reflector.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a solar module.    Solar module (300)    Photovoltaic cell (302)    Spectral concentrator (306)    Side surface (304, 308)    Top surface. (310)