Preparation process and property of lead-free double perovskite nano-powder Cs2AgBiBr6 by ball milling
YU Ying
CAO Bingqiang
Abstract：Cesium bromide,silver bromide and bismuth bromide used as raw materials,a mechanical ball milling process using a planetary ball mill was employed to prepare lead-free double perovskite Cs2AgBiBr6 nano-powder.Under fixed ball milling speed and ball-to-material mass ratio,the nano powder was characterized using X-ray diffraction,Raman spectroscopy,laser par-ticle size analyzer,scanning electron microscope,UV-visible spectrophotometer,steady-state fluorescence spectroscopy,and thermogravimetric analysis.To investigate the influence of ball milling time on the purity,particle size,and morphology of the Cs2AgBiBr6 nano-powder,the optical properties and thermogravimetric analysis of Cs2AgBiBr6 nano powder were also carried out.The results show that Cs2AgBiBr6 nano-powder finally reach pure phase,the particle size of Cs2 AgBiBr6 nano-powder gradually decrease to about 100 nm,and the particle shape changes from rod to round with the increase of milling time.When the grinding speed is 500 r/min,the mass ratio of between grinding ball and raw material is 4.5∶1,the optimal grinding time is 12 h.The band gap of Cs2AgBiBr6 powder is 1.97 eV,and the wavelength of the luminescence peak is 630 nm,which belongs to the visible light band.Cs2AgBiBr6 powder is decomposed at 430 ℃ and can be stored for a long time at room temperature.
Keywords：ball milling processlead-free double perovskitemilling timenano-powderoptical property
Publication Date：2023-12-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：10( 91-100 )