Future Or Present Night Street Lamps Are Lit Overnight In The Daytime

- Aug 12, 2019-

The scientific name of “Luminous Materials” is long afterglow materials, and 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 causes of the long-lasting long-growth material “CaAl2O4:Eu, Nd”. The results have been published in internationally renowned academic journals. Published in Materials Chemistry.


Long afterglow materials, commonly known as "luminescent materials" or light-storing luminescent materials, are characterized by continuous illumination that can be maintained for several tens of minutes to 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 an 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 mechanism of its luminescence and the cause of its long afterglow were completely explained.


“In the foreseeable future, streetlights made from long afterglow materials can provide an overnight illumination only during the daytime sun exposure.” Research team member and professor of Hefei University of Technology introduced Zhang Bo, they passed 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 and development and utilization of long-lasting luminescent materials.