Synthesis and luminescence properties of Mn-doped Cs(2)KBiCl(6) double perovskite phosphors

Novel lead-free double perovskite phosphors of Mn-doped Cs(2)KBiCl(6) (Cs(2)KBiCl(6):Mn(2+)) have been facilely synthesized by using typical hydrothermal method. X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and photoluminescence measurements confirm that the synthesized Cs(2)KBiCl(6):Mn(2+) phosphors behave double perovskite structure, good morphology, excellent stability, and superior optical properties. An optimal doping concentration of Mn/Bi = 0.4 is achieved in Cs(2)KBiCl(6):Mn(2+) phosphors, showing maximum photoluminescence quantum yield of 87.2%, lifetime of 0.98 ms, and orange-red fluorescence with the emission peak at 595 nm under UV light excitation. The probable luminescence mechanism could be ascribed to excitation energy transferring from Cs(2)KBiCl(6) to Mn, and accordingly contributing to the (4)T(1)–(6)A(1) transition of the Mn d electron. Superb optical properties provide much room for in-depth fluorescence researches and potential applications of Cs(2)KBiCl(6):Mn(2+) phosphors. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s11671-023-03820-w.