High-performance yellow emitter is the key to achieve high-quality complementary white organic electroluminescence. Herein, a novel yellow iridium(Ⅲ) complex (Ir1) is synthesized by using chlorine-bearing cyclometalated ligand under the mild condition. The complex is confirmed by nuclear magnetic resonance and X-ray diffraction analysis. In degassed CH2Cl2, the complex shows bright yellow phosphorescent emission with high luminescent quantum yield of 51% and lifetime of 129 μs at room temperature. Notably, the full width at half maximum (FWHM) of emission spectrum is up to 101 nm. Moreover, complex Ir1 is served as triplet emitter in organic light-emitting device. The device exhibits broad yellow emission at 568 nm with FWHM of 88 nm, maximum brightness of 18 310 cd/m2, external quantum efficiency of 20.8%, current efficiency of 58.2 cd/A and power efficiency of 48.3 lm/W.