source：chemeuropeSome raw materials are considered critical by the European Commission. These include many representatives from the rare-earth elements group, for which supply bottlenecks are imminent and no simple substitute options in technological applications exist. With currently no economically feasible mining operations in Europe, an important source is the recycling of electronic waste that contains considerable amounts of these metals. The downside: the process of concentrating the precious material in sizable amounts depends on environmentally harmful chemicals. Researchers at the He...
Release time:
2022
-
06
-
10
viewed：1
source:sciencedailyStudying ancient ocean floors could help discover minerals needed to produce electric cars and solar panels.Researchers at The University of Queensland led a collaborative study that examined the remnants of ocean floors in eastern Australia and central Asia and applied a method to date the age of calcite trapped inside.Dr Renjie Zhou from UQ's School of Earth and Environmental Sciences said the findings could make it easier to source critical minerals used in renewable and clean technologies.'Calcite and other hydrothermal minerals are often observed in critical min...
Release time:
2022
-
06
-
09
viewed：1
source：spectrumRecent reductions in loss ofhollow-core fibersmake them attractive for communication applications. Now a hollow-core fiberdescribed inNature Photonicson 30 May can transport a kilowatt of laser power up to a kilometer away. The development marks a big step for precision machining that requires high-power laser beams.Standard optical fibers—whether they’re being used for communications or machining—work by trapping light aimed along their length inside a solid glass core surrounded by a glass cladding with a lower refractive index. Any light that hits the cladding boundary is per...
Release time:
2022
-
06
-
08
viewed：1
source:natureAll-inorganic lead-free perovskite-derivative metal halides are promising in optoelectronics. However, it remains challenging to realize efficient near-infrared (NIR) luminescence in these materials.A research group led by Prof. CHEN Xueyuan from Fujian Institute of Research on the Structure of Matter of the Chinese Academy of Sciences (CAS) developed novel near-ultraviolet (NUV) light-emitting diode (LED)-excitable NIR emitters based on efficient energy transfer from Te4+ to Ln3+ (Ln = Er, Nd, and Yb) in vacancy-ordered double perovskite Cs2ZrCl6 phosphors.The study was published...
Release time:
2022
-
06
-
07
viewed：3