چكيده به لاتين
The rapid development of PeLED in the last few years is significant compared to other light emitting diodes. In recent years, perovskite nanomaterials have been considered as solar cells and more recently as light-emitting diodes. In recent years, research on metal halide perovskite materials such as MAPb(Cl,Br,I)3 and its compounds have led to useful results that have doubled the hope of replacing PeLEDs. The ability to adjust the bandgap in perovskite materials can lead to the construction of light emitting devices with the desired color spectrum, each of which is used for a specific application. Although the efforts to increase the efficiency of perovskite light emitting diodes have led to acceptable results, many topics in perovskite remain unknown and there is still an opportunity for research and solving challenges in this field. In this dissertation, we succeeded in making a sample of methyl ammonium lead iodide thin film, and changes in thickness and annealing temperature, and investigated the optical properties of the optimized perovskite film with a wavelength of 775 nm, a thickness of 370 nm and an annealing temperature of 100 do. Also, MAPb(I(1-x) Brx)3 thin film samples with different concentrations were also processed. The important features of perovskite thin film, which are considered important in its optical properties, including bandgap energy, Stokes shift, exciton binding energy،, FWHM, minimum emission excitation power, and external photoluminescence quantum efficiency, were measured and reported. Finally, by analyzing and checking the results in each section, the quality of the sample is made and its important issues are discussed. Also, for measuring reliable of photoluminescence and external quantum efficiency, which is an important criterion for evaluating sample quality, for the first time in Iran, we succeeded in building an Integrating Sphere device, which has a port fraction of about 1%. and at the same time it can create different capabilities for measuring photoluminescence, absorption and external quantum efficiency and integration of light.
