Toledo University (UT) physicists have discovered that a new light white-producing material could eventually replace phosphors in LED lights.
According to the physicists – who are part of a global team undertaking this study, the new single material paves way for a new frontier in lighting, which accounts for one-fifth of global energy consumption.
“Due to its high efficiency, this new material can potentially replace the current phosphors used in LED lights – eliminating the blue-tinged hue and save energy,” said UT professor Dr. Yanfa Yan.
“More research needs to be done before it can be applied to consumer products, but the ability to reduce the power that bulbs consume and improve the color quality of light that the bulbs emit is a positive step to making the future more environmentally friendly.”
The material’s equation in composed of a lead-free double perovskite combined with sodium.
“Together, cesium, silver, indium and chloride emit white light, but the efficiency is very low and not usable,” Yan said. “When you incorporate sodium, the efficiency increases dramatically. However, when sodium concentration reaches beyond 40 percent, side effects occur and the white light emission efficiency starts to drop below the peak of 86 percent.”
Yan and post-doctoral researcher Dr. Xiaoming Wang’s study revealed why the new material created by a team from Huazhong University of Science and Technology produces high-efficiency white light.
“It was a wonderful experience working with Dr. Wang and Dr. Yan. Their professional theoretical simulation helps to reveal the emission mechanism of this miracle material,” said Dr. Jiang Tang, professor at Huazhong University of Science and Technology’s Wuhan National Laboratory.
“This lead-free all-inorganic perovskite not only emits stable and efficient warm-white light that finds itself useful for solid-state lighting, but also shows as an encouraging example that lead-free perovskites could even show better performance than their lead cousins.”
Lauding the team’s efforts, Dr. Sanjay Khare, chair of the UT Department of Physics and Astronomy, said that this discovery was likely to open a whole new field in opto-electronics.
Image and content: Dan Miller/University of Toledo