Organic-inorganic Hybrid Photoluminescence Semiconductor

Organic-inorganic hybrid semiconductors have evoked great attentions in the past decades for their enormous applications in photoelectricity,sensors,optics,light emitting diodes and energy transfer,etc.As a new type of composite functional material,it combined the advantages of structure diversities of organic semiconductors and high carrier mobility of inorganic semiconductors.In this article,we have successfully synthesized a series of organic-inorganic hybrid materials through solution method.Photoluminscence measurements,theoretical calculations,single-crystal X-ray diffraction measurements,and UV-Vis absorption spectrum measurements were used to deeply investigate the mechanism and related properties of these hybrids.Using cyclopentylamine,we have successfully synthesized a single-component white-light semiconductor,[C5H9NH3]4CdBr6,which exhibits tunable photoluminance properity,and the color of it can be tuned from blue violet to orange.When excited with 340 nm,the CIE chromaticity coordinates of it is(0.33,0.33).Notably,this value is the same as that of the standard pure white-light emission.Remarkably,it shows an ultrahigh color rendering index of 92.5,which makes it potential material in solid-state lightings.Mechanistic studies indicate that the white-light emission originates from the synergetic effect of deep defects coupled with the organic component.Besides,the conductivity of the compound increases gradually upon raising the temperature,which is typical characteristic of a semiconductor.By introducing 2-methyl-1,5-diaminopentane,we have successfully designed a two-dimentional layered perovskite,[C6H12N2H6]PbBr4,which emits white light upon excited with 280 nm.The CIE chromaticity coordinates of it is(0.24,0.23),corresponding to bluish white light.What's interesting,the color rendering index of the compound is as high as 96,which is the highest value in two-dimentional layered perovskite to date.Mechanistic studies reveal that the white light is arise from the strong electron-phonon coupling owing to the distortion of the inorganic unit([PbBre]2-)in the compound.UV-Vis absorption spectrum certified semiconducting properties of the compound,which shows an absorption edge at 413 nm,and the corresponding band gap is estimated to be 3.0 eV.Using flexible di-n-butylamine we have successfully synthesized an organic-inorganic hybrid compound that emits bright yellow light.The compound exhibits an emission peak at 585 nm with a maximum excitation peak of 345 nn,and the quantum yield is measured as 10.5%.Additionally,the material also undergoes a phase transition at 346 K.Variable-temperature photoluminescence measurements disclose that the phase transition has no influence on the optical properties.Mechanistic studies reveal that the yellow emission originates from the[SbCls]" units in the structure,while the phase transition is owing to the displacement of Sb atoms accompanied with the length changes of hydrogen bonds.