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Lead-free halide double perovskites (DPs) have attracted extensive attention due to their excellent optoelectronic properties, but the synthesis of one-dimensional (1D) organic–inorganic hybrid halide DPs with high photoluminescence quantum yield (PLQY) is still challenging to date. Herein, we successfully prepared high-quality 1D hybrid (TMA)2NaInCl6 (TMA is tetramethylammonium) DPs by two synthetic routes and near-unity PLQY was achieved by incorporating Sb3+ ions into (TMA)2NaInCl6, which is much higher than that of 3D all-inorganic DPs. Temperature-dependent PL spectroscopic characterizations indicated that strong electron–phonon coupling existed in the excited state in doped system. Density functional theory calculations revealed that the incorporation of Sb3+ ions modulated the distribution of density of states and 24-fold enhancing in transition probability thereby significantly improved the PLQY. Our study presented new physical insights for in-depth understanding photophysical mechanisms and should be very important for regulating the optical performance of perovskite materials.
Wu et al. (Sat,) studied this question.