Formula Improvements In Mobility Of Organic Semiconductor And Applications

Organic and polymeric pi-conjugated materials have attracted considerable attention in flat panel display and lighting, as well as in molecular electronics in the past decade. To improve the stability and efficiency of the OLED, the injection of the two kinds of carriers must be in balance. And this will demand that the work function of the pole materials must match the energy level of the luminescent materials. The device consisting of muti-levels is built. Besides this, ETL and HTL are imported to form the multistory structure in the electro-luminescence device and this will be good to the balance of the electrons and holes injecting and finally get the goal to improve the cap ability of the device. Experiments have proved that adopting multistory device will make the driving voltage decrease, the injection of electrons and holes much balanced and then improve the recombination probability and luminescent quantum efficiency.But the organic luminescent theory based on the energy-band structure theory of crystal materials has many defects because of the noncrystal structure of the luminescent structure. Naturally, at present, the theory of the luminescent mechanism of the device has become an important problem. The theory of organic luminescence touches on so many processes such as carrier injection, transfer, recombination, optical output and so on that the analtical key of the problem is very difficult to get in the theoretical study. Many researchers have got the numerical key of relevant problem under different simplex conditions and given better explanations of the experimental results from different points of view. Using these simple models, some phenomena that are difficult to get from experiments can be forecasted and then we will get the academic guidance of the material composition and the choosing of the device structure.In this work, we mainly discuss the dependence relationship of charge-carrier mobility in disordered semiconducting polymers. Based on Gaussian disorder model, improved expression and description of charge-carrier are used to fit experimental results by summarizing and analyzing charge-carrier transport performed in the previous work.The main results are listed as following: 1. Contrast with unified description given by Pasveer W F concerning dependence on temperature, electronic field and charge-carrier density. Based on Gaussian disorder model, we determine the dependence of mobility with an universal Arrhenius temperature dependence, as well as we adopt the description to calculate the current-voltage characteristics of the related materials.2. Comparison to Gaussian widthσ, lattice constant a and mobility parameterμ0 in several papers, we demonstrate these reasons to generate the difference.3. Using the improved description, we analyze the electric properties of the related polymers: NRS-PPV and OC1C10-PPV, which will lay the foundation for future work.