Breakthrough: Red-Emitting Perovskite LEDs Achieve Record Efficiency

• Revolutionary method creates record-efficient red-emitting perovskite LEDs, paving the way for vibrant full-color displays.

Researchers from multiple universities have developed a method to create red-emitting perovskite LEDs with record efficiency. The team, including researchers from China, Korea, and the UK, achieved a peak external quantum efficiency of 28.7% at 638 nm by incorporating a double-end anchored ligand molecule into pure-iodine perovskites. This breakthrough could lead to high-quality and solution-processed LEDs for full-color displays.

While green PeLEDs have been successful, creating pure-red LEDs using iodine-based perovskites has been challenging due to low intrinsic bandgap constraints. The research team used a unique double-ended organic molecule coordination to stabilize the perovskite surface, allowing for a continuously adjustable spectrum in the 620-650 nm range. The resulting LED device emits at 638 nm with excellent spectral stability and a new record for red perovskite LED luminous efficiency.

How did researchers achieve record efficiency in red-emitting perovskite LEDs?

• The researchers incorporated a double-end anchored ligand molecule into pure-iodine perovskites to achieve the record efficiency in red-emitting perovskite LEDs.
• This method allowed for a peak external quantum efficiency of 28.7% at 638 nm.
• Green PeLEDs have been successful, but creating pure-red LEDs using iodine-based perovskites has been challenging due to low intrinsic bandgap constraints.
• The unique double-ended organic molecule coordination stabilized the perovskite surface, enabling a continuously adjustable spectrum in the 620-650 nm range.
• The resulting LED device emits at 638 nm with excellent spectral stability, setting a new record for red perovskite LED luminous efficiency.