Efficient manipulation of photoluminescence by organic cations and Sb doping in hybrid manganese chlorides

Zero-dimensional (0D) Mn(II)-based hybrids with the typical d–d transitions have been rapidly developed benefitting from the environmental friendliness, blue light excitation and the high thermal stability. Herein, we first designed two novel green-emitting 0D Mn(II)-based hybrids (C 16 H 28 N) 2 MnCl 4 and (C 21 H 46 N) 2 MnCl 4 , where the organic cations cocrystallize with four-coordinated [MnCl 4 ] 2- tetrahedrons. Upon blue-light excitation, these two crystals exhibited narrow-band green emission with distinct emission intensity and FWHM as well as thermal quenching behavior, which is analyzed by the influence of the crystal structure of different organic cations on the luminescence performance. Furthermore, multiple emission color can be observed from green to orange-red in (C 16 H 28 N) 2 MnCl 4 :Sb 3+ by regulating the [SbCl 5 ] 2- /[MnCl 4 ] 2- molar ratio or excitation wavelength. Our study not only enriches the influence of organic cations on crystal structure and luminescence performance, but also provides a new direction towards realizing the multi-color emission by Sb 3+ ions doping strategy.