A group of researchers from the Indian Institute of Technology (IIT) Madras has developed a white light-emitting crystal that could potentially replace traditional high-cost materials used in making LED (light emitting diode) products such as lights and displays. could. As the Times of India reports, crystalline materials called halide-perovskites were synthesized in the laboratory, and emitted an intense white light when its structure was deformed. Professor Arvind Kumar Chandiran from the Department of Chemical Engineering explained that this was “not a random synthesis” and that the team did it with “selective atomic precision”. Professor Arvind led the research team along with Professor Ranjit Kumar Nanda B from the Department of Physics.
During the synthesis process, researchers at IIT Madras added specific structures of atoms inside and introduced deformations that led to the emission of intense white light.
“This indigenously developed bright white light emitter can potentially replace conventional high cost materials and save extraordinarily the energy cost per lumen,” Chandiran was quoted as saying by TOI.
According to the researchers, halide-perovskites have unusual optoelectronic or light-emitting properties, with high light-to-current conversion efficiencies. The distorted perovskite can be used independently as a white light emitter, but can also be used as a phosphor – a solid material that emits light – to produce white light, the researchers said. In combination with blue LEDs, the researchers said.
Traditionally, blue, red and green LEDs are combined to produce white light, but the use of such indirect techniques is inefficient, and has forced researchers to look for something that directly emits white light. Can do.
This innovation has already been patented by researchers from IIT Madras, and even recently received the Government of India’s SERB-Technology Award. The team also received a grant of Rs 30 lakh, which they plan to use to make LEDs using deformable perovskite material.
As well as publishing their work, the group of researchers also proposed a design strategy for scientists to create white light emitters.
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