Study On Structure And Performance Of Blue Quantum Dots Light-Emitting Diodes

Quantum Light-Emitting Diodes(QLEDs)have attracted extensive attention due to their small size,low energy consumption,good display performance,and easy fabrication.Despite the rapid development of QLED,there are still many problems to be solved.The transport of carriers within the device and the performance of the emitting layer materials are two major factors that constrain its performance.This paper starts from these two key issues,explores the internal relationship between carrier transport and device performance,and then improves the performance of the device by preparing high performance emitting layer materials.The details are as follows:1.We investigated the relationship between carrier transport and recombination in QLED.For the problem that hole injection in blue QLED is difficult and electron injection is excessive,we introduce 4,4’,4"-Tris(carbazol-9-yl)-triphenylamine(TCTA)and zirconium acetylacetonate(ZrAcac)into the hole and electron transport layers,respectively.The introduction of the doped transport layer effectively promotes the transport and injection of holes while suppressing the transport of electrons on the other side,so that the number of carriers in the light emitting layer is more balanced,improving the brightness and efficiency of the QLED.We also carried out photoelectron simulation of the QLED.The simulation results also show that the carrier distribution in the emitting layer is more uniform and the recombination rate is greatly improved after the introduction of the doped transport layer.The method proposed by us is simple,feasible and effective,and has great application potential.2.We studied on in-situ grown blue emitting perovskite materials.The phase distribution and the crystal orientation in quasi-two-dimensional perovskite are difficult to control,so we proposed to solve the problems by introducing two spacer cations into precursor solution.It is proved by absorption,fluorescence spectroscopy and XRD that the dual spacer cations can effectively adjust the phase distribution and crystal orientation of perovskite,and the optical and electrical properties of the film are simultaneously improved.Based on this result,we have prepared high performance blue LEDs.