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

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 (glum) without sacrificing photoluminescence quantum yield (PLQY). Here, Chiral DMA4In1-xSbxCl7 (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 glum of up to +1.40 x 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 DMA4In1-xSbxCl7. In addition, DMA4In1-xSbxCl7 exhibit excellent thermal stability and mild thermal quenching in the temperature range of 300 to 420 K. These fascinating properties suggest that DMA4In1-xSbxCl7 have significant applications in white light-emitting diodes (WLED), 3D displays and anti-counterfeiting. DMA4In1-xSbxCl7 constructed via achiral units achieve bright white emission, near-unity PLQY and CPL with a glum of up to +/- 1.0 x 10-2. The intrinsic chiral structures and associated spin-polarized energy levels, combined with complementary colors contribute to CPL and white emission. These findings provide new insights for perovskites with enhanced optical properties and applications in 3D displays, WLEDs, and anti-counterfeiting. image