Ultra-small CsPbI3 perovskite quantum dots (QDs) are the most promising candidate materials for achieving efficient and stable pure red perovskite light-emitting diodes (PeLEDs).

However, maintaining the solution phase properties of ultra-small CsPbI3 quantum dots when assembled into conductive thin films is a challenge, which greatly hinders their device applications.

Here, researchers including Zhang Wei, Yuan Mingjian, and Academician Chen Jun from Nankai University and Tianjin Haihe Sustainable Chemical Conversion Laboratory report a method for in-situ deposition of stable ultra-small CsPbI3 quantum dot conductive solids by constructing CsPbI3 quantum dots/quasi-2D perovskite heteroepitaxy. The related paper titled Perovskite heteropitaxis for high efficiency and stable pure red LEDs was published in Nature on February 19, 2025.