13446-03-2Relevant articles and documents
Gram-scale and solvent-free synthesis of Mn-doped lead halide perovskite nanocrystals
Liu, Qian,Liu, Kaikai,Liang, Yachuan,Sun, Junlu,Dong, Lin,Shan, Chong-Xin
, (2020)
Although Mn-doped lead halide perovskites could alleviate the environmental burden of Pb, their synthesis process suffers from intricate operations, high operating temperature, low production, or toxic strong polar solvents. Developing a simple and green route for Mn-doped halide perovskites with mass production is highly desirable for perovskite-derived applications. In this work, we developed a facile and environmental-benign synthesis strategy for large-scale preparation of Mn-doped lead halide perovskite nanocrystals. The nanocrystals were prepared via a mechano-synthesis process without organic solvents. We investigated the influence of atomic composition on their morphology, crystal structure and optical performance. Our results show that the perovskite nanocrystals have dual-emissions from the 4T1 to 6A1 transition of Mn2+ and the excitonic recombination of perovskite hosts, respectively. The achieved Mn:CsPbX3 nanocrystals show well-tailored color rendering when used as LED phosphors. This work presents a scalable and facile strategy for Mn-doped perovskite production without organic solvents, which promises low-cost and eco-friendly LEDs.
Synthesis and Reactivity Towards Dioxygen of Some Manganese(II) Complexes of Tertiary Amines. Crystal Structures of >, 2> and
Lane, Helen P.,Godfrey, Stephen M.,Pritchard, Robin G.,McAuliffe, Charles A.
, p. 701 - 706 (1995)
Some manganese(II)-tertiary amine complexes of stoichiometry MnX2(NR3) have been prepared for the first time.Magnetic susceptibility and X-ray crystallographic studies on (R=Et or n-Pr) indicate that the complexes have a dimeric structure, in contrast to the analogous tertiary phosphine complexes which are polymeric.The crystal structure of which contains a mononuclear manganese site has also been determined.This complex is postulated to arise from reaction of a solution of with trace quantities of moisture.The reaction of the complexes with dioxygen has also been examined: shows no interaction, absorbs 2 mol of dioxygen per mol of complex, whereas absorbs anly 1.In contrast to the analogous tertiary phosphine complexes, the complexes do not exhibit reversible binding of dioxygen.
Novel High-Temperature Polymorphs of MgBr2 and MnBr2 - Limits of Powder Diffraction for Structure Determination
Schneider, Michael,Kuske, Peter,Lutz, Heinz Dieter
, p. 761 - 763 (1992)
High-temperature polymorphs of magnesium bromide and manganese bromide, hexagonal, Rm, Z=3.MgBr2, Mr=184.13, Cu Kα1, λ=1.54051 Angstroem, T=973 K, a=3.9152(7), c=19.420(4) Angstroem, V=257.80(9) Angstroem3.MnBr2, Mr =214.76, neutron radiation, λ=1.594(2) Angstroem, T=773 K, a=3.92240(2), c=19.167(2) Angstroem, V=255.38(3) Angstroem3, Rietveld refinement, 10 2θ 150 deg, Rwp=0.13.The hitherto unknown high-temperature polymorphs of both MgBr2 and MnBr2 crystallize in the CdCl2 form.The manganese compound is pseudocubic =11.0864(1) Angstroem at 773 K> above 623 K.Distinction between the rhombohedral layered CdCl2 structure and the cubic three-dimensional net λ-MnO2 structure is not possible by powder diffraction experiments alone.Additional observations must be employed.The JCPDS File Nos. for MnBr2 and MgBr2 are 43-1499 and 43-1500 respectively.
Hosseiny, Afshin,Mackie, Anthony G.,McAuliffe, Charles A.,Minten, Karl
, p. 99 - 106 (1981)
Piseri, L.,Pollini, I.
, (1984)
Glavas, M.,Ribar, J.
, p. 291 - 295 (1969)
Phase Engineering of Cesium Manganese Bromides Nanocrystals with Color-Tunable Emission
Chen, Junsheng,Han, Keli,Kong, Qingkun,Liu, Qingtong,Liu, Siping,Wang, Yiying,Yang, Bin,Zhang, Hongling,Zhang, Ruiling,Zheng, Daoyuan
, p. 19653 - 19659 (2021)
For display applications, it is highly desirable to obtain tunable red/green/blue emission. However, lead-free perovskite nanocrystals (NCs) generally exhibit broadband emission with poor color purity. Herein, we developed a unique phase transition strategy to engineer the emission color of lead-free cesium manganese bromides NCs and we can achieve a tunable red/green/blue emission with high color purity in these NCs. Such phase transition can be triggered by isopropanol: from one dimensional (1D) CsMnBr3 NCs (red-color emission) to zero dimensional (0D) Cs3MnBr5 NCs (green-color emission). Furthermore, in a humid environment both 1D CsMnBr3 NCs and 0D Cs3MnBr5 NCs can be transformed into 0D Cs2MnBr4?2 H2O NCs (blue-color emission). Cs2MnBr4?2 H2O NCs could inversely transform into the mixture of CsMnBr3 and Cs3MnBr5 phase during the thermal annealing dehydration step. Our work highlights the tunable optical properties in single component NCs via phase engineering and provides a new avenue for future endeavors in light-emitting devices.
