Significantly enhanced electroluminescence performance and stability of all-inorganic perovskite light-emitting de-vices(PeLEDs)have been achieved by adding triton X-100 into the perovskite precursors.The small perovskite grains arranged tightly and formed large grains as the triton X-100 were introduced.Thus the nonradiative defects originated from Pb atoms at the grain boundaries were highly passivated by triton X-100 and resulted in the promotion of PeLED performance,including a turn-on voltage of 3.2 V,a brightness of 63500 cd/m2,a current efficiency of 17.4 cd/A,and a prolonged lifetime of 2 h in air.