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Microlaser arrays play important roles in a variety of cutting‐edge photonic applications. Organic Raman gain materials hold great promise to achieve continuous‐wave (c.w.) microlaser arrays toward compact laser displays. However, due to the high degrees of freedom of molecular self‐assembly, current organic microcrystal arrays suffer from random sizes and orientations, which goes against uniform Raman laser emission toward laser displays. Herein, a strongly constrained self‐assembly method is reported to synthesize homogeneous organic microcrystal arrays providing uniform full‐color c.w. Raman laser emission for laser displays. The strongly constrained self‐assembly method enables strict control of molecular self‐assembly, producing homogeneous organic microcrystal arrays. The single‐component microcrystal arrays support c.w. operation and uniform outputs of single‐mode blue, green, and red Raman lasing. The microcrystal Raman laser arrays exhibit excellent color expression and display capabilities. This work lays the foundation for developing c.w. organic microlaser arrays toward laser displays. [ABSTRACT FROM AUTHOR]

Exciton–polariton condensates featuring collective coherence and large nonlinearities are promising for advancing coherent light sources and functional devices. Nevertheless, their reliance on planar cavities with large lateral device footprints and mode volumes hinders device integration. Plasmon–exciton–polaritons (PEPs), arising from the strong coupling between excitons and plasmons, provide an intriguing platform to explore emergent polariton condensation at the nanoscale due to their ultrasmall mode volumes in metal nanoparticles. However, the substantial radiative and Ohmic losses in metals hamper PEPs condensation, particularly in the short wavelength range (<600 nm). Here, a method is proposed to address metal losses by integrating organic semiconductor neat films onto plasmonic lattices. The use of organic semiconductors with large transition dipole moment and low non‐radiation loss enables efficient coupling between massive excitons and lattice plasmons, leading to high‐density PEPs. This ensures a macroscopic number of polaritons populating the low‐lying band edge at relatively low fluences to obtain bosonic stimulation, resulting in PEP condensation. By tailoring the band structures of plasmonic lattices, the condensation of PEPs are further manipulated into different energy states. These findings offer valuable insights for the design of PEP systems and all‐optical polaritonic devices. [ABSTRACT FROM AUTHOR]

Water vapor is one of the main factors that deactivate an ozone decomposition catalyst, which limits its applications under practical conditions. In this work, a heterostructured Ni/NiO nanocatalyst is synthesized using a citric sol–gel method, which displays 100% removal efficiency to 1000 ppm ozone at room temperature in a dry flow (space velocity 240 000 mL g–1h–1). Importantly, the removal efficiency is still >98% at a high relative humidity RH of 90% after 8 h of testing, which is twice the efficiency of the pure NiO nanoparticles. The high humidity resistance of the Ni/NiO nanocatalyst can be interpreted as the weak adsorption of water on its surface, as proven by H2O temperature-programmed desorption, X-ray photoelectron spectroscopy, and chemiluminescence (CL). Surface atomic models are also established to present the reaction path of ozone on a catalyst surface under high humidity. In addition, as a proof of concept, a heterostructured Ni/NiO foam monolithic catalyst has been synthesized with nearly 100% decomposition efficiency to 10 ppm ozone at RH 90%. Therefore, these results show the great potency of the Ni/NiO heterogeneous nanocatalyst for ozone removal in harsh environments and can improve the understanding of the ozone decomposition process on a catalyst surface under high humidity. [ABSTRACT FROM AUTHOR]