Luminescence Of Halide Perovskites And Applicatinos In LED

The metal halide perovskites as a new generation of semiconductor luminescent materials,which are used in the domain of displaying,lighting,laser and detector widely,which has been a hot topic in the research of active luminescent devices and passive luminescent devices.The metal halide perovskites have excellent performance in the field of electroluminescent diodes because of their high fluorescence quantum efficiency,the narrow emission peak,the broad width of the color domain,the high mobility of the carrier and the low density of the bad defects.The metal halide Perovskite-like has excellent optical luminescence properties due to its strong exciton coupling capacity and soft lattice energy lattice distortion,and its excitation light has the advantages of wide emission peak,large stokes displacement,high quantum efficiency and so on,are widely used in passive WLED devices.On the one hand,the characteristics of the quantum dots of calcium titanite are reinforced by the surface plasma resonance of the gold nanoparticles.It has applied in perovskite emitting diode.On the other hand,the high performance yellow luminescent powder was prepared by antimony elements.It has applied to white light emitting diode.Inparticular,the research content includes the following parts:1.The luminescence properties of Au@CsPb（Br/Cl）₃perovskite quantum dots are analyzed and the principle of enhancement effect is explained.After the combination of gold nanoparticles,the optimized light effect rate of the blue light Perovskite quantum dot was reached by 73%,and the PLQY increased by69.8%relative to the bare CsPb（Br/Cl）₃Perovskite QD.At the same time,through the formula derivation and FDTF simulation,the enhancement process and principle of the increase of the intensity of the electric field in the field of the field surface of the local field surface of the local area of AuNPs are explained.Inaddition,the relationship and principle of surface defects and luminous efficiency reduction were analyzed by the transient absorption spectra and time resolution spectra,and the reasons for the light quench were explained by the combination of excess gold nanoparticles and the perovskite QDs.2.Application Au@CsPb（Br/Cl）₃perovskite to the light-emitting diode.By making QLED which structure is ITO/PEDOT:PSS/Poly-TPD/perovskite QDs/TPBi/Al to contrast the effect of the plasma resonance effect on led devices in the near field of au NPS.The results showed that the maximum brightness and EQE of QLED devices,which were combined after the combination of gold nanoparticles,and promoted to 112cd/m²and 2.17%.However,the working life of the device was reduced.3.Inthe third section,the enhancement effect of element doping on the photoluminescence of metallic perovskite materials.The warm white light halogen perovskite K₇Sb₃Cl₁₆and the yellow light halide halogen perovskite K₃InCl₆:Sb³⁺·H₂O.The PLQY of the two kinds of halide luminescent were50.27%and 69.67%,respectively.It is attributed to the wide yellow light spectrum and high temperature stability,and applied it to the WLED device.The high performance WLED is prepared by the combination of Cs₂NaInCl₆:Sb³⁺and commercial ultraviolet LED chip.The K₇Sb₃Cl₁₆mixed Cs₂NaInCl₆:Sb³⁺resulted the resulting that WLED color coordinates at（0.3277,0.29）,the color temperature is 5923 K,and the color number Ra is 86.652.The K₃InCl₆:Sb³⁺·H₂O mixed Cs₂NaInCl₆:Sb³⁺prepared the resulting that WLED color coordinates at（0.3442,0.3265）,the color temperature is 5012 K,and the color number Ra is 80.575.These results show that the two different paths of the combination of gold nanoparticles and Antimony doping antimony elements enhanced the luminescence characteristics of different metal halide.Through characterization and simulation,it is systematically explained that gold nanoparticles enhance the surface electric field intensity of perovskite nanocrystals through surface local plasmon resonance effect,thus improving the luminescence properties of perovskite quantum dots and the electroluminescence properties of perovskite QLED devices.The enhancement effect of antimony doping on the photoluminescence properties of metal halide perovskite was verified by experiments and characterization.At the same time,two high-performance WLED devices are prepared.Ingeneral,the work done in this thesis contributes to the development of the field of metal halide luminescence enhancement.