The Study On Fabrication And Performance Of Red Organic Electroluminescent Devices By Dye-doped Tetraphenylporphyrin Compounds

Organic electroluminescent devices have attracted particular attention because of their potential applications in efficient, low -voltage, easy-fabrication, and full-color flat panel displays. Although certain blue- and green-emitting materials have efficiencies sufficient for practical use, red-emitting materials with low brightness, impure color (unsaturated emission) and low efficiency is still not satisfactory. One goal in the research on organic electroluminescent devices is to develop full-color display. Therefore, it is vitally necessary to develop red organic electroluminescent devices.According to porphyrins' characteristics to have excellent optoelectronic properties and existing problem in red organic electroluminescent devices, this thesis is aimed to fabricate and study red organic electroluminescent devices by doping porphyrins into tris(8-hydroxylquinoline)aluminum.This thesis was focus on the fabrication of organic electroluminescent devices and comparison with their luminescent performance. It was divided into three sections.At first, we simply introduced developing history, the luminescent mechanism, the structure and the fabrication of organic electroluminescent devices. And we summarized research advances on red electroluminescent devices and porphyrins in the luminescent field. Then tris(8-hydroxylquinoline)aluminum(Alq3) with the purity of above 98 percent which was always used as electron transport materials is synthesized by modifying reaction condition and seven tetraphenylporphyrin with different substituent were prepared. The structure of all these compounds were testified by UV-Vis,MS and NMR .And then, we analyze the UV-Vis and fluorescence spectra of all the synthesized porphyrins and give a reasonable explain for their spectral difference.In section two, we designed the technology of fabricating doped organic electroluminescent devices according to the existing vacuum film-plating machine and construct electroluminescent devices by doping tetraphenylporphyrine into tris(8-hydroxylquinoline)aluminum(Alq3) with different intensity as the structure of ITO/TPD /Alq3+TPP/Al.At last, the luminescent mechanism of devices by doping porphyrin into Alq3 was discussed. The effect of different dopants and different mol percentage on luminescent performance was analyzed with comparing and studying the performance of thedevices. And a reasonable explaine for their difference of the performance was given.It is concluded that effect of different compound and different mol percentage on luminescent performance by analysis and comparison, which will provide the basis for designing and preparing novel and efficient red-emitting materials and promote the development of red luminescent materials.