Efficient Circularly Polarized Luminescence and Bright White Emission from Hybrid Indium‐Based Perovskites via Achiral Building Blocks

Abstract Chiral organic‐inorganic hybrid perovskites (OIHPs) exhibit exceptional optical and chiral properties, demonstrating potential for 3D display, circularly polarized light‐emitting diodes (CP‐LEDs), and CPL switches. However, the construction of chiral OIHPs often relies on chiral building blocks, limiting chemical diversity, and possessing challenges in achieving large asymmetry factor (g_lum) without sacrificing photoluminescence quantum yield (PLQY). Here, Chiral DMA₄In_1‐xSb_xCl₇ (DMA = dimethylammonium, x = 0 to 1) with superior circularly polarized luminescence (CPL) are successfully constructed based on achiral building blocks DMA⁺ and metal halides. By optimizing the Sb³⁺ content, bright white emission with a high PLQY of 69.13% is achieved, as well as near‐unity PLQY yellow emission and strong CPL signals with a g_lum of up to +1.40 × 10⁻², exhibiting a performance comparable to state‐of‐the‐art chiral OIHPs. Combining optical characterizations and theoretical calculations reveal that these intriguing properties originate from the intrinsic chiral helical structures and a pair of perfect complementary color emissions in DMA₄In_1‐xSb_xCl₇. In addition, DMA₄In_1‐xSb_xCl₇ exhibit excellent thermal stability and mild thermal quenching in the temperature range of 300 to 420 K. These fascinating properties suggest that DMA₄In_1‐xSb_xCl₇ have significant applications in white light‐emitting diodes (WLED), 3D displays and anti‐counterfeiting.