The article presents a novel approach to reduce the electroluminescence (EL) rise time of perovskite light-emitting diodes (PeLEDs) to microseconds, which is crucial for developing high-refresh-rate active-matrix displays. The researchers developed an individual-particle passivation strategy using BF4- ions during film deposition, which passivates every nanocrystal in the perovskite emissive layer, leading to a defect-free film with excellent crystallinity and a discrete nanostructure. This approach effectively inhibits ion migration, reducing the EL rise time from milliseconds to microseconds. The method was applied to red, green, and blue PeLEDs, achieving response times within microseconds and high external quantum efficiencies (EQEs) of 22.7%, 26.2%, and 18.1%, respectively. The microsecond-response PeLEDs were integrated into active-matrix displays with resolutions of 30 pixels per inch (ppi) and 90 ppi, demonstrating uniform brightness and efficiency. The study highlights the potential of individual-particle passivation for creating fast-response, high-performance PeLEDs for high-refresh-rate displays.The article presents a novel approach to reduce the electroluminescence (EL) rise time of perovskite light-emitting diodes (PeLEDs) to microseconds, which is crucial for developing high-refresh-rate active-matrix displays. The researchers developed an individual-particle passivation strategy using BF4- ions during film deposition, which passivates every nanocrystal in the perovskite emissive layer, leading to a defect-free film with excellent crystallinity and a discrete nanostructure. This approach effectively inhibits ion migration, reducing the EL rise time from milliseconds to microseconds. The method was applied to red, green, and blue PeLEDs, achieving response times within microseconds and high external quantum efficiencies (EQEs) of 22.7%, 26.2%, and 18.1%, respectively. The microsecond-response PeLEDs were integrated into active-matrix displays with resolutions of 30 pixels per inch (ppi) and 90 ppi, demonstrating uniform brightness and efficiency. The study highlights the potential of individual-particle passivation for creating fast-response, high-performance PeLEDs for high-refresh-rate displays.