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Category: space – Page 7

Novel crystal strategy yields brighter, longer-lasting all-inorganic perovskite LEDs

Perovskite has broad application prospects in solar cells, light-emitting diodes (LEDs), and detectors due to its high luminescent efficiency and low cost. However, electrons and holes in traditional perovskite materials often struggle to effectively recombine and emit light. As a result, the strongly space-confined method is commonly employed to improve luminescence efficiency. Furthermore, how to enhance the brightness of LEDs and extend their lifespan has become a top research priority in this field.

In a study published in Nature, Prof. Xiao Zhengguo’s team from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences has proposed a novel strategy based on weakly space-confined, large-grain crystals of all-inorganic perovskite to prepare with larger crystalline grains and higher temperature resistance. Researchers increased the brightness of perovskite LEDs (PeLEDs) to over 1.16 million nits and extended their lifespan to more than 180,000 hours.

Researchers developed the strategy based on the weakly space-confined technique. They first added specific compounds—hypophosphorous acid and ammonium chloride—to the perovskite material. Then, they prepared a new type of perovskite thin film with larger crystalline grains and fewer defects using a high-temperature annealing process.

Global mercury levels in rivers have doubled since Industrial Revolution, research reveals

Mercury levels in the world’s rivers have more than doubled since the pre-industrial era, according to new research from Tulane University that establishes the first known global baseline for riverine mercury pollution.

The study, published in Science Advances, developed a process-based model to simulate mercury transport in rivers and found that global rivers carried approximately 390 metric tons of mercury to the oceans annually before 1850. Today, that figure has jumped to about 1,000 metric tons per year.

Primary drivers of the increase are wastewater discharge, soil erosion and mercury releases from industrial activities and mining, said lead author Yanxu Zhang, associate professor of Earth and environmental sciences at Tulane School of Science and Engineering.

Cosmic mystery deepens as astronomers find object flashing in both radio waves and xuhuong rays

Astronomers from the International Center for Radio Astronomy Research (ICRAR), in collaboration with international teams, have made a startling discovery about a new type of cosmic phenomenon.

The object, known as ASKAP J1832-0911, emits pulses of radio waves and X-rays for two minutes every 44 minutes.

The paper, “Detection of X-ray Emission from a Bright Long-Period Radio Transient,” is published in Nature.

Record-breaking cosmic structure discovered in colossal galaxy cluster

Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster—spanning nearly 20 million light-years. The finding challenges long-standing theories about how particles stay energized over time. Instead of being powered by nearby galaxies, this vast region seems to be energized by giant shockwaves and turbulence moving through the hot gas between galaxies.

On ore-bearing asteroid remnants in lunar craters

The organization of this paper is as follows. In Section 2 we introduce the formalism used to estimate the number of lunar craters containing ore-bearing asteroid remnants. In Section 2.1, we use the formalism to estimate the number of PGM ore-bearing craters, and in Section 2.2, we use it to obtain the number of water-bearing craters, before concluding in Section 3.

There’s an infinite amount of energy locked in the vacuum time. Could we ever use it?

The bottom line is that no matter what the zero-point energy is, it’s the background of the universe on top of which all of physics takes place. Just as you can’t go lower than the ground floor of a building with no basement, you can’t get lower than the ground state of the universe — so there’s nothing for you to extract, and there’s no way to leverage that into useful applications of energy.

So, unfortunately, any work you do in the universe will have to be done the old-fashioned way.