| In the era which witnesses the rapid development of science and technology,the Micro-LED has become a hot topic in the display industry as it processes the potential of fullfiling the continual improving requirements on display quality.The Micro-LED can reach the size of a few microns,which means that the resolution of the display can be further elevated.In addition,Micro-LED stands out in display applications due to its many advantages,e.g.,spontaneous light,high brightness and efficiency,fast response time,low energy consumption and lightness.At present,the Micro-LED display is being challenged not only by the mass transfer printing,but also the full-color solution.The application of perovskite quantum dot,due to its advantages such as narrow spectral line-width,high quantum efficiency and easy synthesis,has attracted an increasing amount of attention.However,in its practical scenario the application on the Micro-LED display in specific-the perovskite quantum dot film is vulnerable to the influence of factors such as light,heat and atmosphere,and these factors will change the photoelectric properties of the films.Much of the previous work has been focused on the degradation of perovskite material itself,but lack of studies on the quality of color quality it produced when excited by short-wave LED chips.The dominant wavelength of perovskite material is determined by its halogen content ratio and the phenomenon of self-absorption.Therefore,in order to control the color outcome precicely,it is of great significance to study the self-absorption of perovskite quantum dot film.The research objective of this paper is to optimize the halogen content ratio,and the quantum dot concentration ratio,after establishing the theoretical model of excitation light wavelength,perovskite quantum dot ligand concentration,system efficiency and optimal color gamut.In this paper,the self-absorption of MAPbBr3 perovskite quantum dot film is experimentally verified and theoretically modeled.The specific work includes:1.Preparation of perovskite quantum dot films with a series of relative concentration(53.5 mol/m3,107 mol/m3,214 mol/m3,and 428 mol/m3).First,PVDF was selected as the coating of quantum dots.The preparation process mainly included preparation of solution,magnetic stirring,spin coating,and baking evaporation.Secondly,the as-prepared perovskite film was characterized,and the diffraction peak obtained by XRD test proved that the formed substance was MAPbBr3.Then,the morphology of the sample was analyzed by TEM,and the quantum dots were uniformly distributed in the acquired image,and the uniform particle size was about 3 nm.Finally,the absorption spectrum and PL spectrum of the film were tested.2.The Gaussian fitting of the PL spectra of 16 samples measured by IS were performed by Origin.First,the curve fitting results are characterized by the sum of squared residuals and the correction coefficient.The results show that the fitting methods are reliable.Secondly,the theoretical non-self-absorption spectrum under ideal conditions is derived.By analyzing the main parameters of the non-self-absorption spectrum and the PL spectrum,it is concluded that the higher the peak value of the intermediate concentration of the perovskite quantum dot film is.Finally,based on the known spectral properties of the four concentrations,Matlab was used to predict the non-self-absorption spectrum and PL spectrum of other concentrations,further confirming that the concentration of 107 mol/m3 is the optimal concentration. |
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