At present, energy consumption for lighting accounts for one-fifth of the total energy consumption in the world. According to a research paper published in Nature, a team of international scientists, including physicists at the University of Toledo (UT), discovered a single material that produces white light. The latest frontier developments in the field of lighting have opened the door.
Dr. Yanfa Yan, Professor of UT Physics, said: "This new material is highly efficient and is expected to replace the phosphors currently used in LED lamps. It can eliminate blue light and save energy. However, it is used in the market. In the past, more research was needed. In general, reducing the power consumption of the lamp and improving the color quality of the light in performance is a positive step toward a green future."
A method of synthesizing this particular inorganic compound is to fuse the lead-free double perovskite with the sodium phase. Professor Yan said: "According to the traditional method, the combination of bismuth, silver, indium and chlorine will emit white light, but this method is very inefficient and cannot be applied in practice. However, when you add sodium to these compounds At the same time, the efficiency is significantly improved. However, when the sodium concentration exceeds 40%, side effects occur, and the white light emission efficiency also begins to drop below the peak of 86%.
Dr. Yan and Dr. Xiaoming Wang, a postdoctoral researcher at UT, conducted theoretical calculations with the support of the Energy Front Research Center (CHOISE) under the US Department of Energy. The calculations revealed new materials developed by the research team led by Jiang Tang of Huazhong University of Science and Technology in China. The theoretical reason for the ability to emit high-efficiency white light.
Professor Tang of Wuhan National Laboratory of Huazhong University of Science and Technology explained: "The theoretical simulation experiments of Dr. Wang and Dr. Yan help to reveal the luminescence mechanism of this magical material. This lead-free all-inorganic perovskite not only delivers stable and efficient It is a very useful warm white light in solid-state lighting, and it can prove that lead-free perovskites can even perform better than their similar lead mines. This is an encouraging and exciting case. UT Physics and Astronomy Dr. Sanjay Khare, the head of the department and professor, pointed out: "The white light emitted by a single material may open a new direction in the field of optoelectronics. ”