Active Luminous Quantum Dot Self‐Assembled Microsphere Volumetric Display

Abstract Volumetric display is a type of technology that generates visuals in three dimensions. The image formed in this manner can be viewed with the naked eye without the need for any wearable device. The volumetric display generates a 3D image that is real in size and appears to be a vivid object that can be viewed from any direction, allowing the viewer to interact with the image. A volumetric display technique based on light‐emitting colloidal quantum dots (CQDs) is developed, thanks to their flexible assembly capability, low heat conductivity, and attainable high photoluminescence quantum yield (PLQY). This approach uses a single laser beam to create a 3D display with a micrometer resolution. The effect of CQD's heat capacity and heat conductivity on the microsphere's photophoretic force (PPF) is investigated, and the results suggest that only heat conductivity has a significant impact on the PPF. It is also discovered that the shape and size of the microsphere have a great impact on the PPF; microspheres with a diameter comparable to the size of the optical trap, or with a nonspherical shape, are more easily captured.