A thumbtack-like nanostructured shape comprising a plurality of first parts and a second part; wherein the plurality of first parts are aligned and oriented in parallel; wherein the first part comprises nanowires with an elongated shape with a long axis L and a short axis S, a length l measured along the long axis L, a width w measured along the short axis S, with the length l being larger than the width w and with the length l being smaller than 1 μm, the first part having a first longitudinal end and a second longitudinal end, the first part comprising a first absorbing material and an emitting material, the emitting material being surrounded by the first absorbing material; wherein the nanostructured shapes are aligned with a longitudinal axis L of the first part aligned in a predetermined direction; wherein each of the first parts comprise a quantum dot as emitting material; wherein the quantum dot is surrounded by a semiconductor material; wherein the second part comprises nanoparticles having a substantially planar structure; wherein the second part comprises a second absorbing material, each of the emitting material, the first absorbing material and the second absorbing material comprising a semiconductor material having a bandgap, with the bandgap of the first absorbing material being larger than the bandgap of the emitting material and with the bandgap of the second absorbing material being at least as large as the bandgap of the first absorbing material, the second part being connected to the first longitudinal end of the first part in a first connection region, wherein the second part is arranged to form a semiconductor layer; wherein the nanoparticles of the semiconductor layer are in contact with each other and in contact with the first parts; wherein the semiconductor layer comprising the second part is arranged on a first connecting region of the first parts; characterized in that the second part mainly absorbs light with direction of polarization other than the long axis L of the first part or mainly absorbs light in a combination of directions of polarization, each of the directions of polarization being different from the long axis L and the nanostructured shape emits light mainly polarized along the long axis L of the first part. wherein the plurality of first parts are aligned and oriented in parallel; wherein the first part comprises nanowires with an elongated shape with a long axis L and a short axis S, a length l measured along the long axis L, a width w measured along the short axis S, with the length l being larger than the width w and with the length l being smaller than 1 μm, the first part having a first longitudinal end and a second longitudinal end, the first part comprising a first absorbing material and an emitting material, the emitting material being surrounded by the first absorbing material; wherein the nanostructured shapes are aligned with a longitudinal axis L of the first part aligned in a predetermined direction; wherein each of the first parts comprise a quantum dot as emitting material; wherein the quantum dot is surrounded by a semiconductor material; wherein the second part comprises nanoparticles having a substantially planar structure; wherein the second part comprises a second absorbing material, each of the emitting material, the first absorbing material and the second absorbing material comprising a semiconductor material having a bandgap, with the bandgap of the first absorbing material being larger than the bandgap of the emitting material and with the bandgap of the second absorbing material being at least as large as the bandgap of the first absorbing material, the second part being connected to the first longitudinal end of the first part in a first connection region, wherein the second part is arranged to form a semiconductor layer; wherein the nanoparticles of the semiconductor layer are in contact with each other and in contact with the first parts; wherein the semiconductor layer comprising the second part is arranged on a first connecting region of the first parts; characterized in that the second part mainly absorbs light with direction of polarization other than the long axis L of the first part or mainly absorbs light in a combination of directions of polarization, each of the directions of polarization being different from the long axis L and the nanostructured shape emits light mainly polarized along the long axis L of the first part.