Inorganic ammonium (NH) is the simplest amine cation with perfect symmetry, the smallest radius and many H atoms, allowing itself to be used as a potential dopant in achieving high-quality perovskite materials. As a composition-modulation strategy, NH-doped (NH)CsCuI (0 < < 1.5) lead-free perovskites were successfully synthesized the eco-friendly ball milling method in this work. As the ammonium content increases, the lattice constants of (NH)CsCuI shrink and the grain sizes increase. The doping of NH effectively passivates the lattice defects, suppresses the non-radiative recombination and tunes the energy band structure, resulting in better fluorescence properties. UV-pumped deep-blue LEDs based on (NH)CsCuI phosphors were fabricated, which showed improved performance and tunable emission. These results demonstrate the potential of the NH-doping strategy for improving the performance of lead-free perovskite optoelectronics.
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