High Quantum Efficiency of Stable Sb-Based Perovskite- Like Halides toward White Light Emission and Flexible X-Ray Imaging

摘要

Although low-dimensional hybrid metal halides have emerged as promising light emitters due to their broadband emission originated from self-trapped exciton (STE), the synthesis of lead-free halides with high photoluminescence quantum yield remains a challenge. Herein, a series of new luminescent single crystals of antimony-based metal halides Na(DMSO)_2_3SbBr_(6?x)Cl_x (x = 0, 2, 3, 4, 6) is synthesized. By optimizing the ratio of Br and Cl, Na(DMSO)_2_3SbBr_3Cl_3 exhibits an ultra-broadband yellow light emission peaking at 606 nm with a full width at half-maximum of 160 nm and a high photoluminescence quantum yield of 90.6. Both experimental characterizations and theoretical calculations indicate that STE emission is responsible for the ultra-broadband yellow light emission. Furthermore, blue LED chip-pumped white light-emitting diodes by using the yellow-emitting Na(DMSO)_2_3SbBr_3Cl_3 are demonstrated, showing a correlated color temperature of 3948 K and a color rendering index of 85. Finally, a large-size and flexible Na(DMSO)_2_3SbBr_3Cl_3 scintillator used for X-ray imaging is prepared by a template assembled method, exhibiting a high spatial resolution of 15.5 lp mm~(?1) and a low detection limit of 285.8 nGyair s~(?1). This work highlights the potential of Sb-based halides in solid-state illumination and X-ray imaging.