Mn-based Organic (CH₆N₃Cl) Inorganic Hybrid Metal Halide Luminescence Control And Its Devices

In recent years,organic-inorganic hybrid metal halide perovskite materials can form a new composite crystal material through the self-assembly of organic small molecules and inorganic molecules.This superposition structure of organic and inorganic components not only has the mechanical stability,thermal stability and photoelectric function of inorganic components,but also the flexibility and processability of organic components,making it an optical function an emerging hot spot in the field of materials and device research.Therefore,studying the synthesis of halide perovskite luminescent materials,the mechanism of luminescence enhancement and the improvement of thermal stability are of great significance for the expansion of such luminescent materials in the fields of white LED lighting and display.Here,this thesis mainly focuses on several organic-inorganic hybrid Mn²⁺-based metal halide luminescent materials,and the research results obtained are as follows:(1)A high-efficiency and thermally stable lead-free red light Mn²⁺-based organic-inorganic hybrid metal halide(CH6N3)2MnCl4 was synthesized by mechanochemical method.It exhibits strong red light emission at 650 nm,and its PLQY is 55.9%.Thanks to its unique ferromagnetic coupling trimer[Mn3Cl12]6-linear chain clusters constructed crystal structure,its luminous intensity at 380 K can be maintained at 88.9%of 300 K(?RT),showing good thermal quenching resistance.The excellent thermal stability is attributed to the relatively weak electron-phonon coupling effect,and the Huang-Phys factor is only 2.65 meV.(2)A high-efficiency and thermally stable lead-free red light Mn²⁺-based organic-inorganic hybrid metal halide(CH6N3)2MnCl4:8%Zn²⁺was synthesized by mechanochemical method,showing strong red light emission at 650 nm.This is still due to its unique ferromagnetic coupling trimer[Mn3Cl12]6-linear chain cluster crystal structure.The doping of Zn²⁺does not affect the luminous peak position of(CH6N3)2MnCl4,and the luminous intensity has been improved to a certain extent,and the luminous efficiency has also increased from 55.9%to 59%,which means that the introduction of Zn ions leads to an increase in the cluster spacing and enhancement glow.With the increase of Zn²⁺doping concentration,the life span does not change much,indicating that there is weak energy transfer between adjacent luminescent centers.(CH6N3)2MnCl4:8%Zn²⁺can also be effectively excited by commercial blue InGaN chips.The warm white LED prepared by(CH6N3)2MnCl4:8%Zn²⁺has better electroluminescence(EL)performance,and the color temperature(CCT)is about at 3900 K,its luminous efficiency(LE)was significantly increased to 91.41 lm/W,and its color rendering index(CRI)reached 93.7.It has good electroluminescence stability,which proves that(CH6N3)2MnCl4:8%Zn²⁺is effective in WLEDs application potential.(3)A high-efficiency red light Mn²⁺organic-inorganic hybrid halide(CH6N3)2MnCl4:4%Sb3+was synthesized by the slow solvent evaporation crystallization method.The doping of Sb3+ does not affect the luminous peak position of(CH6N3)2MnCl4,and significantly increases the luminous intensity of(CH6N3)2MnCl4,and the luminous efficiency is also increased from 55.9%to 65%.As the doping concentration of Sb3+increases,the lifetime increases from 1.66 ms to 1.70 ms.Doping causes little change in lifetime,indicating that there is weak energy transfer between adjacent luminescent centers.In general,Sb doping will not change the original material properties,and will further improve the light-emitting performance of the material.