Neodymium chloride doping and homogeneous passivation in CsPbBr3 nanocrystals for efficient blue light-emitting diode

Abstract

Perovskite light-emitting diodes (PeLEDs) have significant potential for display and lighting applications. However, the intrinsic issues such as material stability, efficiency limitation, spectral purity and color gamut challenges have hindered the development process. In this work, the efficient blue light PeLEDs were obtained through multiple modifications of doping strategy and surface passivation. Incorporating NdCl3 into CsPbBr3 perovskite nanocrystals (PeNCs) causes lattice contraction and improves crystallization quality, thereby increasing the photoluminescence quantum yield (PLQY) and reducing non-radiative recombination. Further homogeneous passivation with didodecyl dimethylammonium chloride (DDAC) can effectively fill the halogen vacancies on the surface of PeNCs, thus to reduce surface defects. Ultimately, the PeLEDs achieved a highest external quantum efficiency (EQE) of 15.74% at the emission wavelength of 478 nm. This study can provide important insights into the multi-component regulation of high-performance blue light PeLEDs and build the foundation for their practical application in full-color display.