芴-咔唑新型共聚物/PVK掺杂体系的电致发光特性研究

研究了新型的芴-咔唑共聚物(PFC)与聚乙烯咔唑(PVK)掺杂体系的光致发光和电致发光特性.制备了结构分别为indium-tin-oxide(ITO)/PVK:PFC/bathocuproine(BCP)/tris-(8-hydroxylquinoline)-aluminum (Alq₃) /Mg:Ag，ITO/PFC/BCP/Alq₃/Mg∶Ag和ITO/PVK/BCP/Alq₃/Mg∶Ag的三种有机电致发光器件.对器件的光电特性进行了测试.结果表明，掺杂体系中的PVK有效地抑制了固态膜中PFC激基缔合物的形成.掺杂器件在不同的外加电场作用下发生发光层位置的移动，通过调节外加电场，可以获得从绿光到蓝光的可见光发射.当外加电压大于7V时，掺杂器件的蓝色发光亮度达到1650cd/m²，推测其中可能存在从PVK到PFC的能量传递过程.

Electroluminescence characteristics of a blend system based on a novel fluorene-carbazole copolymer and PVK doping system

The photoluminescent and electroluminescent characteristics of a blend polymer system consisting of a novel fluorene-carbazole copolymer (PFC) and poly(vinylcarbazole) (PVK) were investigated. Three OLED devices with the structures of indium-tin-oxide (ITO)/PVK:PFC/bathocuproine(BCP)/tris-(8-hydroxylquinoline)-aluminum (Alq₃)/Mg∶Ag, indium-tin-oxide(ITO)/PFC/bathocuproine(BCP)/Alq₃/Mg∶Ag and indium-tin-oxide(ITO)/PVK/ bathocuproine(BCP)/Alq₃/Mg∶Ag respectively, were fabricated. The optoelectronic properties of the devices were measured. The results demonstrated that PVK in the blend system effectively restrained the formation of PFC excimers in solid films. Light emission of the device with blend system shifted with the variation of applied electric field, and variable color ranging from green to blue could be obtained. The luminance of blue light reached 1650cd/m² when the drive voltage was higher than 7V. It was inferred that an energy transfer process from PVK to PFC might have occurred in this blend system.