The recent miniaturization of semiconductor light emitting devices (LEDs), such as mini- and micro-LEDs demands stable and efficient down-converting materials with nano-to-submicron dimensions. YAG:Ce, because of its many beneficial properties, is an interesting candidate for these applications when available at the nanoscale. This talk gives an overview of our technologies on achieving stable, well-defined nano-YAG:Ce phosphors with high energy conversion efficiencies. We discuss different synthesis approaches, after treatments and encapsulation technologies, and how these influence the structural and optical properties, and offers nano-YAG:Ce from sub-micron particles down to sizes in the order of ten to 20 nm.
Hot carrier cooling in halide perovskites is governed by the interplay of carrier-carrier and carrier-phonon interactions, and so the study of their dynamics can reveal important underlying photophysical processes operating in these materials. Here, ultrafast pump-push-probe spectroscopy is used to isolate hot carrier dynamics in lead halide perovskite nanomaterials spanning a range of sizes and shapes. A weak size-dependence is shown by cuboidal CsPbBr3 nanocrystals, while 2D CsPbBr3 nanoplatelets and Ruddlesden-Popper (PEA)2PbI4 display a hot phonon bottleneck that becomes increasingly suppressed with greater excitonic character. This is attributed to an enhanced influence of carrier-carrier scattering in low-dimensional perovskites.
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