Halide perovskites are fast emerging as formidable candidates for next-generation display and lighting technologies, owing to their exceptional optoelectronic properties and solution-processability. However, within the "three primary colors" of perovskite light-emitting diodes (PeLEDs), the performance of blue-light devices has persistently fallen short. Specifically, all-bromide blue-light PeLEDs are plagued by challenges such as inferior material stability, high defect density, and non-uniform phase distribution. These issues have led to external quantum efficiencies (EQEs) that are notably lower than those of their red and green counterparts. Organic ligand engineering is widely regarded as pivotal for enhancing the performance of blue-light PeLEDs. Nevertheless, previous research has predominantly centered on the electronic or coordination effects of ligands, with only limited exploration into how the spatial configurations of ligands influence perovskite crystallization, defect passivation, and carrier behavior.