Green (G) and red (R) light-emitting materials, such as quantum dots, perovskite nanocrystals, and inorganic phosphor powders, owing to their excellent optical characteristics, have attracted researchers’ attention as color-conversion materials for lighting and display applications. However, these materials contain environmentally harmful elements, such as Pb or Cd, and/or they are synthesized using environmentally harmful synthetic approaches and conditions, involving the use of organic solvents, high pressure, high temperature, harsh atmosphere, and long reaction time. In this study, as an eco-friendly synthetic approach to synthesize lead-free Cs 3 MnBr 5 G powder phosphor, we suggest an evaporative crystallization process of aqueous reactant solution. This synthetic process does not use toxic elements or solvents and the crystallization process utilizes only low reaction temperature and short reaction time under air atmosphere conditions. We successfully synthesized Cs 3 MnBr 5 green powder phosphor, with excellent optical properties, by evaporative heating of a 200 nm syringe-filtered solution at 150 °C for 2 h. The synthesized Cs 3 MnBr 5 phosphors have a photoluminescence quantum yield of 66.3%, a peak wavelength of 520 nm, a narrow bandwidth of 38 nm, and a photoluminescence decay time of 0.34 ms under blue excitation. This phosphor is expected to be a useful alternative G-emitting material that can compete with commercial green quantum dots, perovskite nanocrystals, or inorganic phosphors.
Polariton lasing of nanorods is investigated in a multiple-layered axial heterostructure to realize tunable features of lasing, such as the threshold, wavelength, and mode spacing. In a cylindrical nanorod with the configuration of GaN/AlGaN/InGaN/AlGaN/GaN prepared using a top–down approach, the excitonic emission of composite materials indicates the successful formation of the heterostructure, while the distinctive lasing of individual composites suggests controllable properties in the heterostructure. The optical confinement effects enhance the development of an exciton–polariton, leading to the characteristic refractive index in each layer due to the energy-dependent dispersion. The unique Fabry–Pérot modes of lasing propose manageable mode spacing by varying the polaritonic effects and composite materials, even without a change in the length. In addition, the feature of a polariton improves the reflectivity of end facets, which is further enhanced by the modification with silver to lower the lasing threshold. Polariton lasing in the multiple-layered axial heterostructure nanorod is observed for the first time, demonstrating the possibility of controlling the characteristics of lasing by the modulation of the gain volume, layer sequence, and end facet. Polariton nanolasers are expected to enhance the efficiency of nanoscale devices with tunable wavelength, optical gain, and mode spacing.
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