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A passively Q-switched and mode-locked c-cut Nd:LuVO4 laser at 1.06 μm using Cr 4+ :YAG absorber has been successfully demonstrated. A nearly 100% modulation depth of mode-locking was achieved. At pump power of 12.04 W, the maximum average output power of 0.64 W and Q-switched pulse envelop repetition rate of 60 kHz were obtained with absorber's initial transmission of 96%, while the highest Q-switched pulse energy of 14.11 μJ was achieved with initial transmission of 60%. The duration of mode-locked pulse within Q-switched envelop was estimated to be 750 ps with 110 MHz repetition rate. 50.0% 50.0%An expanded mode-locked pulse within Q-switched pulse envelope

An as-grown TbNbO4 crystal has a negative thermal expansion and the zero thermal expansion could be achieved.

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Electrochemiluminescence (ECL) represents a widely explored technique to generate light, in which the emission intensity relies critically on the charge‐transfer reactions between electrogenerated radicals. Two types of charge‐transfer mechanisms have been postulated for ECL generation, but the manipulation and effective probing of these routes remain a fundamental challenge. Here, we demonstrate the design of quantum dot (QD) aerogels as novel ECL luminophores via a versatile water‐induced gelation strategy. The strong electronic coupling between adjacent QDs enables efficient charge transport within the aerogel network, leading to the generation of highly efficient ECL based on the selectively improved interparticle charge‐transfer route. This mechanism is further verified by designing CdSe‐CdTe mixed QD aerogels, where the two mechanistic routes are clearly decoupled for ECL generation. We anticipate our work will advance the fundamental understanding of ECL and prove useful for designing next‐generation QD‐based devices.

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The lack of an efficient and stable electrocatalyst for oxygen evolution reaction (OER) greatly hinders the development of various electrochemical energy conversion and storage techniques. In this study, we report a facile synthesis of FeCoNiCuIr high-entropy alloy nanoparticles (HEA NPs) by a one-step heat-up method. The involvement of glucose made the NPs grow uniformly and increased the valence of Ir. The resulting FeCoNiCuIr NPs exhibit excellent OER performance in alkaline solution, with a low overpotential of 360 mV to achieve a current density of 10 mA cm−2 at a Tafel slope of as low as 70.1 mV dec‒1. In addition, high stability has also been observed, which remained at 94.2% of the current density after 10 h constant electrolysis, with a constant current of 10 mA cm‒2. The high electrocatalytic activity and stability are ascribed to the cocktail effect and synergistic effect between the constituent elements. Our work holds the potential to be extended to the design and synthesis of high-performance electrocatalysts.