Effect of Sintering Temperature on Structure and Luminescent Properties of Nano-Mn3B7O13Cl

Abstract

Chambersite (Mn₃B₇O₁₃Cl) precursor was prepared by the citric acid method, sodium borate dehydrate was used as a boron source, modified by cetyl trimethyl ammonium bromide (CTAB) as a surfactant, and its pH value was adjusted to 5 by ammonia. Mn₃B₇O₁₃Cl nanoparticles were prepared by sintering at 500, 560, 600, and 650°C, respectively, and then ground by mortar. The microstructure, surface morphology, and luminescent properties of the prepared nano-Mn₃B₇O₁₃Cl samples were analyzed by XRD, SEM, and fluorescence spectrometer. The effect of sintering temperature on the synthesis of manganese nano-Mn₃B₇O₁₃Cl powder was studied. The prepared nano-Mn₃B₇O₁₃Cl samples are spherical particles with irregular edges. When the sintering temperature is 650°C, the size of nanoparticles is the smallest, with an average size of 35 nm. When the excitation wavelength is 450 and 460 nm, the emission spectra of the nano-Mn₃B₇O₁₃Cl samples prepared at different sintering temperatures have two emission peaks. There is a green emission peak at 550 nm and a red emission peak at 652 nm. When the excitation wavelength is 470, 480, and 490 nm, the emission spectra of the nano-Mn₃B₇O₁₃Cl samples at different sintering temperatures have an emission peak in the range of green light band at 567, 589, and 601 nm, which is different from that at 450 nm and 460 nm. Under different excitation wavelengths, the emission peak intensity of the prepared nano-Mn₃B₇O₁₃Cl samples sintered at 560°C is the highest, and the luminescence performance is better. The lowest emission peak and luminescence properties of the nano-Mn₃B₇O₁₃Cl samples sintered at 500°C were studied. The excitation peak in the green band shifts to the orange band with increased excitation wavelength. The luminescence of the nano-Mn₃B₇O₁₃Cl samples prepared at different sintering temperatures is the ⁴T₁–⁶A₁ transition of Mn²⁺ ion.