In a groundbreaking collaboration, Prof. Cui Linsong’s research team from the University of Science and Technology of China (USTC) and Prof. Samuel D. Stranks’ team from the University of Cambridge have revolutionized the performance of blue light-emitting diodes (LEDs) based on perovskite materials. Their innovative strategy has been published in Nature Photonics and holds great promise for the future of lighting and displays technology.

While green, red, and near-infrared perovskite LEDs have shown significant progress, the development of blue perovskite LEDs has faced challenges, creating a bottleneck in the industry. This lag has slowed down the advancement of perovskite LED technology, limiting its potential impact.

To tackle this issue, the research team introduced a multifunctional ionic additive, Bis(triphenylphosphine)iminium chloride (PPNCl), with unique properties that enhance the performance of blue perovskite LEDs. By enabling precise control over the composition and distribution of perovskite phases, PPNCl effectively suppresses non-radiative recombination channels and ion migration, leading to improved efficiency and stability in the devices.

PPNCl interacts with the components of the perovskite through hydrogen bonding, influencing the crystallization process and promoting the transition to high-dimensional phases with enhanced luminescence efficiency. This additive accelerates energy transfer processes, preventing energy loss and non-radiative recombination in low-dimensional phases. Additionally, PPNCl coordinates with perovskite components, passivating defects in perovskite films, and inhibiting halide ion migration, resulting in a significant enhancement in luminescence efficiency and spectral stability.

Thanks to the effective control exerted by PPNCl, the research team achieved high-efficiency and stable blue perovskite LEDs with a peak external quantum efficiency (EQE) of 21.4% (emission peak at 483 nm), the highest efficiency reported in blue perovskite LEDs so far. The devices also demonstrated a 30-fold increase in stability, showcasing the potential for further advancements in blue perovskite LED technology.

This innovative achievement not only represents a significant milestone in blue perovskite LED technology but also opens up new possibilities for the future of lighting and displays. The success of PPNCl in enhancing the efficiency and stability of perovskite LEDs paves the way for continued progress in this field, indicating a bright future for the integration of perovskite materials in commercial applications.

Physics

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