Inkjet Printing Matrix Perovskite Quantum Dot Light‐Emitting Devices
Danyang Li, Junjie Wang, Miaozi Li, Gancheng Xie, Biao Guo, Lan Mu, Haiyang Li, Jian Wang, Hin‐Lap Yip, Junbiao Peng
Abstract
Abstract Perovskite light emitting devices have been expected to be utilized in the field of displays. In this work, a stable FA 0.3 Cs 0.7 PbBr 3 perovskite quantum dot ink with optimized octane:dodecane cosolvent is obtained by introducing a trace amount of long‐chain ligand of oleylamine (OAm) during the quantum dot purification process. A green electroluminescent matrix device with 120 pixels per inch (PPI) is realized from the ink by using an inkjet printing technique, exhibiting a luminance of 1233 cd m −2 , a peak current efficiency of 10.3 cd A −1 , and an external quantum efficiency of 2.8%. The results may suggest a possibility of making perovskite quantum dot displays by using the inkjet printing technique.