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Near‐infrared (NIR) phosphors have gained a substantial amount of attention in the past few years simply due to their numerous applications. Recent publications have reported interesting findings regarding the fundamentals of phosphors. However, the unclear application of these phosphors limits their potential. This mini review aims to provide insights for researchers regarding the potential applications of NIR phosphors and their perspectives for further development of NIR phosphor technology. [ABSTRACT FROM AUTHOR]

The design of high‐energy‐density batteries is the future goal of research on Li‐ion batteries. Halide‐type solid‐state electrolytes (SSEs) exceed their counterparts in terms of their stability at high potential. In this minireview, we discuss the developments in the work on halide‐type SSEs for all‐solid‐state Li batteries. In particular, we focus on the Li3InCl6 structure. The effect of synthesis routes on this structure, as well as the convertible products resulting from its phase changes, is discussed. Conductivity can be increased and the electrochemical window can be improved through doping with different materials. Our review aims to provide readers with an overview of the stability and degradation of Li3InCl6 SSE and the structure of halide‐type SSEs (Li–M–X, where M is a metal and X is a halogen). [ABSTRACT FROM AUTHOR]

Limiting the carbon emission to the atmosphere requires the efficient utilization of carbonaceous gases and their capture via well‐designed platforms. Metal–CO2 batteries are currently being demonstrated as the route to utilize CO2 and produce energy simultaneously. In particular, Na–CO2 batteries are considered an alternative to Li‐batteries because of their abundance and low cost. In the current review, the developments in the field of Na–CO2 batteries are discussed. Carbon dioxide reactions to the decomposition of discharge products have been discussed elaborately. The main discharge products of Na–CO2 batteries are Na2CO3 and C. In the current review, various strategies are discussed to decompose the discharge products and hence improve cycle stability. The fraction of CO2 has a substantial influence on cell cycles. A plausible route of battery reaction can be drawn with the help of an ex situ analysis of the electrodes. The final part of the review focuses on the use of solid‐state Na‐ion conductors in Na–CO2 batteries. [ABSTRACT FROM AUTHOR]

Development of a solar water splitting device requires design of a low-cost, efficient, and non-noble metal compound as alternative to noble metals. For the first time, we showed that CoSe2 can function as co-catalyst in phototoelectrochemical hydrogen production. We designed a heterostructure of p-Si and marcasite-type CoSe2 for solar-driven hydrogen production. CoSe2 successively coupled with p-Si can act as a superior photocathode in the solar-driven water splitting reaction. Photocurrents up to 9 mA cm−2 were achieved at 0 V vs. reversible hydrogen electrode. Electrochemical impedance spectroscopy showed that the high photocurrents can be attributed to low charge transfer resistance between the Si and CoSe2 interfaces and that between the CoSe2 and electrolyte interfaces. Our results suggest that this CoSe2 is a promising alternative co-catalyst for hydrogen evolution. [ABSTRACT FROM AUTHOR]

Development of a solar water splitting device requires design of a low-cost, efficient, and non-noble metal compound as alternative to noble metals. For the first time, we showed that CoSe2 can function as co-catalyst in phototoelectrochemical hydrogen production. We designed a heterostructure of p-Si and marcasite-type CoSe2 for solar-driven hydrogen production. CoSe2 successively coupled with p-Si can act as a superior photocathode in the solar-driven water splitting reaction. Photocurrents up to 9 mA cm−2 were achieved at 0 V vs. reversible hydrogen electrode. Electrochemical impedance spectroscopy showed that the high photocurrents can be attributed to low charge transfer resistance between the Si and CoSe2 interfaces and that between the CoSe2 and electrolyte interfaces. Our results suggest that this CoSe2 is a promising alternative co-catalyst for hydrogen evolution. [ABSTRACT FROM AUTHOR]

Blue, green, and yellow phosphors are obtained in the Sr1−xY0.98+xCe0.02Si4N7−xCx system (x=0→1). Decreases in thermal quenching barrier height with x result from a dominant neighboring‐cation effect, through which the replacement of Sr2+ by Y3+ reduces the covalency of CeN bonding. Green emission is observed from a cation‐segregated nanostructure of SrYSi4N7 and Y2Si4N6C domains in x=0.2–0.6 samples. [ABSTRACT FROM AUTHOR]

Blaue, grüne und gelbe Leuchtmaterialien werden vom Sr1−xY0.98+xCe0.02Si4N7−xCx ‐ System (x=0→1) gebildet. Die Schwelle für die thermische Lumineszenzlöschung sinkt mit zunehmendem x. Ursache ist ein dominanter Nachbarkationeneffekt, der dazu führt, dass beim Ersatz von Sr2+ durch Y3+ die Kovalenz der Ce ‐ N ‐ Bindung gemindert wird. Die grüne Emission tritt bei einer kationensegregierten Nanostruktur von SrYSi4N7 ‐ und Y2Si4N6C ‐ Domänen in Proben mit x=0.2 – 0.6 auf. [ABSTRACT FROM AUTHOR]

In this study, lithium phosphorus oxynitride (LiPON) thin films were deposited by radio frequency (r.f.) magnetron sputtering of a lithium phosphate (Li3PO4) target with various powers. The crystal structure, morphology, chemical environment, ionic conductivity, electronic state and coordination type were sequentially characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and X-ray absorption spectroscopy, respectively. As the results, the optimal ionic conductivity was achieved by the r.f. power of 75 W. Furthermore, the P-N valence states of hybrid orbitals were increased with increasing the nitrogen amounts. [ABSTRACT FROM AUTHOR]

Semiconductive marcasite-type CoSe2 nanorods are prepared by hydrothermal reaction of CoCl2 and Se in aq. [ABSTRACT FROM AUTHOR]

The valence state of Eu in the new phosphor Ca12Al14O32F2:Eu3+ is tuned by replacing Al3+-F- by the dopant Si4+-O2-. [ABSTRACT FROM AUTHOR]