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Circularly polarized electroluminescence (CPEL) is an active area of research because of its wide application in 3D displays and anti‐counterfeiting. However, it is not trivial to obtain a high asymmetry factor for highly efficient CPELs. Herein, a highly efficient CPEL is demonstrated with a superior asymmetry factor by using a chiral phosphine‐oxide‐passivated perovskite film as an emitter. An in situ‐formed perovskite nanocrystalline (NC) film is obtained by passivation of the chiral phosphine oxide. The as‐formed film exhibits much‐enhanced photoluminescence compared with the pristine film. More importantly, the NC film exhibits excellent chiral photoluminescence with a luminescence dissymmetry factor glum as high as 5.6 × 10−3. Electrically driven light‐emitting diodes based on the NC film exhibited superior device performance with a maximum brightness of 18,783 cd m−2 and a peak external quantum efficiency of 3.6%. More encouragingly, an unprecedented electroluminescence asymmetry factor gEL of up to 0.18 is achieved because of the chiral lattice distortion of the perovskite, which is the state‐of‐the‐art among hybrid materials. [ABSTRACT FROM AUTHOR]

Zero-dimensional (0D) organic-inorganic hybrid materials have attracted extensive attention due to their facile preparation and excellent optical characteristics. However, achieving superior photophysical properties and excellent stability is still desirable for their practical application. Sb(III)-based metal halides owning 5 S2 lone-pair are prone to form deformable building units, which is beneficial for efficient self-trapped excitons (STE) emission. Herein, a 0D Sb(III)-based metal halides DIPA 2 SbCl 5 (DIPA+ = 4-amino-3,5-diiodopyridin-1-ium) was obtained by solvothermal method at room temperature, which exhibited highly efficient broadband emission at 652 nm with a photoluminescence quantum yield (PLQY) of 87.1% and outstanding stability against moisture. Then, a white-light-emitting diode (WLED) was fabricated by mixing DIPA 2 SbCl 5 with green phosphor ((Sr, Ba) 2 SiO 4 : Eu2+) and blue phosphor (BaMgAl 10 O 17 :Eu2+), with the CIE coordinates of (0.351, 0.371), a correlated color temperature of 4183 K and a color rendering index of 93.3. This work provides a universal solution to obtain hybrid materials with efficient luminescence properties and potential applications. • An orange-red emitting Sb3+-based 0D metal halide hybrid, which exhibits excellent luminescence with STE features. • A full-spectra WLED with a high CRI was fabricated by mixing the Sb(III) hybrids with commercial blue and green phosphors. • The fabricated WLED shows good operating stability under constant current density. [ABSTRACT FROM AUTHOR]