金向程同学的论文"Facile Assembly of High-quality Organic-inorganic Hybrid Perovskite Quantum Dot Thin Films for Bright Light-Emitting Diodes"发表在Adv. Funct.Mater.上

2017-12-14     来源:站内    关键词:揭建胜课题组     浏览量:303
Abstract
Organic-inorganic hybrid perovskite (CH3NH3PbX3, X = Cl, Br or I) quantum dots (QDs) have shown superior optoelectronic properties and been regarded as one of the most ideal materials for next-generation optoelectronic devices, particularly for QDs-based light-emitting diodes (QLEDs). However, there are only a few reports on CH3NH3PbX3 QLEDs and the reported performance is still very poor, primarily due to the difficulites in the fabrication of high-quality compact QDs thin films from low-concentration QDs suspensions. In this work, we developed an electric-field-assisted (EFA) strategy for efficient fabrication of uniform CH3NH3PbBr3 QDs thin films with high photoluminescence quantum yields (PLQY, 80%-90%) from dilute CH3NH3PbBr3 QDs suspensions (~0.1 mg/mL) within 5 mins. Benefited from the high-qulity CH3NH3PbBr3 QDs thin films, the corresponding QLEDs delivered a highly bright green emission with maximum luminances of 12450 cd/m2. Furthermore, a current efficiency of 12.7 cd/A, a power efficiency of 9.7 lm/W, and an external quantum efficiency (EQE) of 3.2% were acheived by enhancing the hole injection. To our knowledge, the performance represents the best results for CH3NH3PbBr3 QDs-based QLEDs. These results indicate an important progress in the fabrication of high-performance CH3NH3PbX3 QLEDs and demonstrate their huge potential for the next-generation displays and lightings.