Fabrication And Characteristics Test Of ITO/CuPc/Alq₃/Al Organic Light-emitting Diodes

Organic light-emitting diodes (OLED) have become a shining star in the electronic display field since the end of the 1980s. This technology exhibits bright prospect in photoelectricity field due to its advantages of low DC drive voltage, active luminescence, excellent hue saturation, wide visual angle, etc. Nowadays, small-area OLED have been commercially produced in the area of mobile meters, screens of mobile phones digital cameras, etc. However, some problems, especially on stability and lifetime need to resolve.The research progress on luminous materials was introduced particularly. The latest development status about OLED display in domestic and abroad was also presented.Introduce the emitting theory, structure and the parameters of OLED. The structure and fabrication Technology of OLED is introduced.Organic thin films and organic light-emitting diodes were prepared by vapor thermal deposition using 8-hydroxyquinoline aluminum(Alq₃)and copper phthalocyanine (CuPc). The anode is fabricated by direct(DC) reation sputtering method. The cathode is fabricated by DC sputtering method. The organic films are deposited by vacuum vaporization method. Finally, the relatively stable OLED emitting green color resulting from 8-tris-hydroxyquino-line aluminum is obtained. By measuring and analyzing the current-voltage-brightness characteristics. The organic light-emitting diodes structure of ITO/CuPc/Alq₃/Al behaves like a rectifier and has good light-emitting properties and stabilization. The brightness increased vs. the increase of drive voltage, and the relative intensity of luminescence is 2641I/a.u. And the Luminescence phenomena only happened at Alq₃ film. It's formating the heterojunction between the CuPc and Alq₃ films. It's contribute to injectiving hole carrier and the formation of blocking barrier, and improve the efficiency of the exciton formation at Alq₃ layer. This device has a simple structure, easy preparation and high luminous intensity.This study would help construction the OLED device functional layer composite and improve the process.