| 초록 |
Colloidal perovskite nanocrystals (PNCs) are promising next generation light emitter because of their high color purity and low-cost processability. In addition, PNCs can be easily applied both self-emissive and down-conversion application. Such advantages have led to rapid progress in efficient PNC and perovskite light-emitting diodes (PeLEDs). To achieve efficient PNC emitters, increasing the radiative recombination and lowering the non-radiative recombination should be considered. Here, we report a one-dopant alloying strategy that confines more electrons and holes and reduces non-radiative recombination. Doping of guanidinium into FAPbBr3 PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. To reduce extra defects, halide-based molecule was applied as a defect healing agent. Through these defect suppression strategies, efficient PeLEDs with 108 cd A−1 (EQE of 23.4%) were achieved. |
