The metal halides have superior optoelectronic properties because of their special electronic structures, such as the ns2 metal halides (Pb2+, Sb3+, Sn2+, etc.) and dx metal halides (Zn2+, Cd2+, Mn2+, etc.). The Mg halides, which have unfriendly electronic structures with high excited state energy levels, conflicts with the basic requests of luminescent metal halides. Here we found efficient luminescent properties for the Mg halides. A series of Mg halides have been synthesized and studied. Under ultraviolet (UV) excitation, Li2MgCl4 and RbMgCl3 exhibit violet light emissions at 350 nm and 430 nm, CsMgCl3 and Cs2MgCl4 exhibit blue light emissions at 465 nm and 480 nm. CsMgCl3, RbMgCl3, and Li2MgCl4 show high thermal stability due to the strong rigidity of the crystal structures. With the doping of Mn(II) ions into the Mg sites, their emission colors could be further tuned. Based on the unique photoluminescence of the Mg halides, we have successfully applied the as-synthesized materials into green lighting and anti-counterfeiting devices. Our study shows that Mg halides are also a family worthy studying, shedding light on the exploration of metal halides as efficient optoelectronic semiconductors.
Huan Zhang,Chang Liu,Yu Wang,Feifei Jia,Shaoxian Song
In this work, Mn (II) was doped into MoS 2 structure and then anchored on activated alumina beads to construct 3D-sized composites (Mn-MoS 2 @AABs). This component material was used as PMS activator for tetracycline (TC) degradation under light irradiation. According to experiment results, Mn-MoS 2 @AABs exhibited well degradation performance to TC, which ascribed to excellent photo-response property of Mn-MoS 2 and activation of Mn. Importantly, the 3D-sized structure made it facilely be recycled from solution, which catered to the demand for the practical application. Therefore, the novel strategy of designing Mn-MoS 2 @AABs had great significance for environmental restoration.
Tao Huang,Hui Peng,Qilin Wei,Chengyu Peng,Ye Tian,Shangfei Yao,Xinxin Han,Bingsuo Zou
If we introduce transition metal ions with spins into an organic-inorganic halide perovskite compounds, interesting spin dependent optical properties may be seen in this system. This paper reports an organic-inorganic hybrid manganese ion doped lead halide crystal incorporated by TDMP (trans-2,5-dimethylpiperazinium), it gives not only the STE1 (polaronic exciton), usually brought up by the enhanced electron-phonon coupling in the amine incorporated compound, but also give a novel bipolaronic exciton (STE2) for the paired charge state formation due to the incorporation of bi-amine cationic molecules, a excitation by the polaronic molecule due to enhanced electron-phonon coupling and neighboring correlation out of the Mn ion ferromagnetic spin coupling in the lattice at slightly high doping. Such magnetic bipolaron state could often be accompanied by several multiphonon Raman modes and ferromagnetism. It is even interesting that this state can give super-high red emission with PLQY at ~92.5% at room temperature. Moreover, the emission color and intensity could also be modulated by the Mn doping concentration, temperature, and laser excitation power. The low doping products can give green emission out of single Mn d-d transition at very low temperature or high laser excitation power. The intermediately doped products can give white emission out of STE1 and STE2. The highly doping products give red emission out of STE2 (bipolaron states) at room temperature or low laser power. These interesting phenomena reflected the microscopic interactions between spins, carriers and phonons in the products, which can be found applications in the future fields of photonics and spintronics.
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