Future or current night street lights, daylighting and daylighting

The scientific name of "Luminous Materials" is long afterglow material, and the items such as "Night Light Cup" and "Night Pearl" are made of long afterglow materials. Recently, Hefei University of Technology collaborated with the research team of the University of Nebraska-Lincoln to discover the luminescence mechanism and cause of the long-lasting long-growth material “CaAl2O4:Eu, Nd”, which has been famous internationally. Published in the journal Material Chemistry.

Long afterglow materials, commonly known as "night light materials" or light-storing light-emitting materials, are characterized by continuous light emission that can be maintained for several tens of minutes to several tens of hours after being excited by visible light or ultraviolet light. Such materials are in low-light illumination, emergency indication, Information storage and display, energy-efficient buildings, intelligent transportation and other fields have a wide range of applications.

The long afterglow material that has been found to have the longest afterglow time and wide application prospects is “CaAl2O4:Eu, Nd”. This blue-violet light material has a afterglow time of more than 19 hours. However, despite years of research, the mechanism of its luminescence remains unclear and restricts development and application.

In recent years, with the support of the National Natural Science Foundation of China and Anhui Province, the research team of the School of Materials Science and Engineering of Hefei University of Technology cooperated with the University of Nebraska-Lincoln to use the first-principles calculation method to systematically “CaAl2O4: The electronic energy level structure of various impurities and defects in Eu, Nd" was theoretically studied, and the luminescence mechanism and the cause of its long afterglow were completely explained.

“In the foreseeable future, streetlights made with long afterglow materials can only provide an overnight illumination when exposed to the sun during the day.” Zhang Bo, a member of the research team and professor at Hefei University of Technology, introduced the “CaAl2O4:Eu The analysis of the Nd" luminescence mechanism further proposes possible ways and methods for designing and synthesizing other new long-lasting luminescent materials, which is of great significance for promoting the theoretical research, development and utilization of long-lasting luminescent materials.

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