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IIT-Madras Team Makes White Light Emitting Crystal

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Halide-perovskite crystal emitted an intense white light when its structure was distorted

A research team from the Indian Institute of Technology, Madras, has synthesised a white light emitting halide-perovskite crystal in the laboratory that can be used for energy saving and long-lasting LED lights and display. The team crystalline material emitted an intense white light when its structure was distorted.

"It was not a random synthesis. We did it with selective atomic precision. While synthesising, we added specific composition of atoms inside and introduced distortion, which led to the emission of intense white light," said Aravind Kumar Chandiran, department of chemical engineering, who led the research team along with Ranjit Kumar Nanda B from the department of physics.

"This indigenously developed bright white light emitter can potentially replace the conventional highcost material and phenomenally save the energy cost per lumens," he added.

The researchers said the distorted perovskite can be used independently as a white light emitter or as a phosphor that emits light, in combination with blue LEDs to produce white light.

The distorted material also showed high stability under ambient conditions. The emission of intense light and stability make them useful in long-lasting, energy-saving lighting applications. Besides general lighting, white LEDs can be used in LCD backlights, display mobile lighting, and medical and communication equipment.

The innovation, which has been patented, recently received the Government of India's SERB-Technology Translation Award and the team plans to produce LEDs using the distorted perovskite material.

'Manipulation of parity and polarization through structural distortion in light-emitting halide double perovskites' by Tamilselvan Appadurai et al; Communications Materials volume 2, Article number: 68 (2021)

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