photoluminescence tagged posts

A new approach to quantum light emitters generates a stream of circularly polarized single photons, or particles of light, that may be useful for a range of quantum information and communication applications. A Los Alamos National Laboratory team stacked two different atomically thin materials to realize this chiral quantum light source.

“Our research shows that it is possible for a monolayer semiconductor to emit circularly polarized light without the help of an external magnetic field,” said Han Htoon, scien...

Changes in colors emitted through mechanochromism a) When the blue crystal in emission was ground at the center, the color turned yellow. b) A round filter paper thinly coated with blue mechanochromic molecules in emission. The yellowish letters “Au” appeared after scratching the surface with a spatula. Credit: Image courtesy of Hokkaido University

In mechanochromism, certain solid and liquid crystalline materials change their photoluminescence properties upon mechanical stimulation, such as grinding, ball-milling and crushing. Although such compounds have attracted much attention with hopes of various applications, it has heretofore been thought difficult to synthesize mechanochromic compounds with desired emission properties and behaviors as each molecule emits different color.

A tea...

Ultrathin sheets of a new 2-D hybrid perovskite are square-shaped and relatively large in area, properties that should facilitate their integration into future electronic devices. Credit: Courtesy of Peidong Yang, Berkeley Lab

These ionic materials exhibit optical properties not found in 2D covalent semiconductors eg graphene, making them promising alternatives to silicon for future electronic devices. To the growing list of 2D semiconductors, eg graphene, boron nitride, and molybdenum disulfide, whose unique electronic properties make them potential successors to silicon in future devices, you can now add hybrid organic-inorganic perovskites...