Setfos Software Simulation And Implementation Of Organic Light-emitting Devices Based On Phosphorescent （tbt）₂Ir（acac）

Optical software is considered as a powerful tool for engineering design andscience research, since the software simulation can be made for the device structuredesign, model simulation and so on, which can reduce a lot of unnecessary experimentsand time consuming works. Organic light-emitting devices （OLEDs） have advantages oflight, thin, flexible, self-emission, wide viewing angle and so on, showing greatpotential application in both display and solid-state lighting fields. But, OLEDsimulation softwares, especially for phosphorescent OLEDs, are very rare. In this work,software design and optical simulation were made for phosphorescent OLEDs, whichwere based on an iridium complex of （tbt）₂Ir（acac） as a probe. By comparing theexperimental results with that of the software simulations, the reliability and accuracy ofthe simulations could be verified. The main work can be given as follows:1. The overall design and flow chart for the optical simulation program ofphosphorescent OLED were made, considering the unique properties such as tripletstate of phosphorescent （tbt）₂Ir（acac） material;2. The intrinsic performance of phosphorescent （tbt）₂Ir（acac） material was studiedby testing the photoluminescence （PL） spectra and absorption spectra of phospshor,which were dissolved or doped at various concentrations in both solution and film states.Therefore, the physical factors, such as, the triplet energy （the unique paratemer ofphosphor）, the spectral peak, and the energy band could be obtained;3. According to the simulation functions and goals, the flow charts were designedand to the programme were completed, thus, software simulations and results analysiswere made based on OLED devices. In the single emitting layer （EML） devices, the PLspectra of both blue NPB and yellow （tbt）₂Ir（acac） simulated from the software werenearly the same as those of the nature spectra. As for the double-EML OLED, the devicespectra were not changed largely while separately changing the thicknesses of yellowand blue EMLs, but the bias voltage had great effect on the device spectra. The CIEcoordinates were also simulated. Meanwhile, the simulation of exciton recombinationzone and distribution were also carried out, which could explain the light emissions in phosphorescnet devices;4. In order to verify the effectiveness of the optical simulation results for theOLEDs, as series of phosphorescent OLEDs were fabricated by constructing the devicestructure, which was similar to that for the simulation design. The thicknesses of theyellow and blue EMLs were changed, and the optical and electrical properties weretested and analyed. It was found that the experimental results were in good agreementwith the optical simulation, by comparing the emission spectrum and CIE coordinates,which verified the validity and reliability of the software simulation. The results alsodemonstrated that the highest luminance of18,000cd/m2and power efficiency of5.1lm/W were obtained by using0.2nm （tbt）₂Ir（acac）, while the highest luminance of17,680cd/m2and power efficiency of5.0lm/W were obtained by using3-nm NPB asthe blue EML.In summary, a simulation platform with high reliability and accuracy forphosphorescent OLED was built, based on an yellow iridium complex （tbt）₂Ir（acac）phosphorescent material, by introducing exciton energy transfer coefficients a1and a2.This work laid the foundation for more reliable and more accurate phosphorescentOLED simulation platform.