Researchers at the Centre for Nano and Soft Matter Sciences (CeNS) in Bengaluru have developed a new technique to enhance next-generation lighting.
According to the Department of Science and Technology, currently, emerging light-related technologies like Organic LEDs (OLEDs) that offer vibrant colors, QLEDs that provide precise colour control and durability and micro/mini-LEDs that deliver high brightness and stability, are shaping the future of lighting.
“While thin and flexible OLEDs are costly and have shorter lifespans, QLEDs are toxic and their production is challenged by resource scarcity and Micro/Mini-LEDs are limited in their application due to high production costs,” the Department said.
Perovskite LEDs
It further added that Perovskite (class of compounds which have the same type of crystal structure as CaTiO3 – Calcium Titanate) LEDs (PeLEDs) combine the advantages of OLEDs and QLEDs, positioning them as an excellent choice for next-generation lighting.
“However, their widespread application is limited by challenges such as sensitivity to heat and moisture, as well as colour instability caused by anion migration (which occurs when halide ions – chloride, bromide, or iodide – move between quantum dots in mixed layers),” it added.
CeNS researchers have developed an innovative method to minimise anion migration in CsPbX₃ perovskite nanocrystals.
The team, led by Pralay K. Santra, synthesized green light emitting cesium lead bromide (CsPbBr₃) perovskite nanocrystals using a hot injection method, where oleylamine serves as the passivating ligand. “To enhance stability, they applied argon-oxygen (Ar-O₂) plasma treatment, which immobilizes the surface ligands by creating a cross-linked, hydrophobic layer. This approach effectively stabilizes the ligands and slows anion exchange, significantly improving colour stability by several orders,” the department said.
This breakthrough has been published in the journal Nanoscale and provides valuable insights into stabilising perovskite nanocrystals, paving the way for efficient, durable optoelectronic devices.
Published – March 02, 2025 08:05 pm IST