Found a Method to Maximize the Emission Efficiency of Next-Generation LED Materials

KAIST-Hanbat Univ Joint Research Team Identifies Cause of Enhanced Emission Efficiency in Perovskite LED Nanomaterials

Schematic Diagram of the Mechanism for Increasing the Emission Efficiency of Perovskite LEDs

[Asia Economy Reporter Kim Bong-su] Domestic researchers have succeeded in theoretically identifying the cause of improved luminous efficiency occurring in perovskite LED nano materials.

KAIST announced on the 12th that Professor Kim Hyung-jun's research team from the Department of Chemistry collaborated with Professor Hong Ki-ha's research team at Hanbat National University to achieve this result. Halogen perovskite compounds are attracting attention as materials that can be used in next-generation solar cells because they can produce electricity with high efficiency using sunlight. Meanwhile, LEDs are devices that emit light by using electricity, in contrast to solar cells, and are widely used in displays. Surprisingly, perovskites are known not only for their high efficiency in converting light into electricity but also for their high luminous efficiency in converting electricity into light, making them promising materials for next-generation LEDs.

Originally, "perovskite" is the name of a mineral crystal structure named after the Russian scientist Perovski. The research team focused on the fact that this perovskite crystal structure can have various phases depending on the degree of internal distortion. The perovskite material CsPbBr3, widely used as an LED material, has distortions inside its crystal structure, but when made into small nano structures, a phase with minimized distortion is formed. Using non-adiabatic quantum dynamics simulations, the research team revealed that controlling the distortion of this crystal structure is a key material property control strategy to enhance luminous efficiency.

The researchers said, "Through this study, we were able to elucidate the complex correlation between the structural characteristics of perovskite materials and the photodynamic properties that generate light," and added, "In the future, by further expanding this theoretical fundamental research, we expect to derive strategies to maximize luminous efficiency through perovskite phase control, contributing to the development of high-efficiency perovskite-based LEDs."

The results of this study were published online on December 27 last year in the international academic journal Journal of the American Chemical Society.

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