| 摘要 |
A lamp is provided which is useful for railway and airfield signal lights. The lamp has a primary light source 101 and an optical element comprising a lens comprising patterned cylindrical wells 301-303. Each well contain quantum dots (QDs), and a sealing forming an airtight seal of the QDs within the wells. The patterned cylindrical wells comprise concentric circles and the QDs contained within wells of a first subset of the concentric circles emit light having a different wavelength than light emitted by QDs contained within a second subset of the concentric circles. This allows the QD phosphors to down-convert light from a primary light source and provide red or green light. The lamp aims to have reduced colour blending/bleeding between green and red in particular. The QDs may be contained within polymer beads. |
