單層式白光高分子發光二極體

Abstract

在本研究中，將利用單層結構的方法來完成白光高分子發光二極體的研製，其完整結構為ITO/PEDOT：PSS/Host：Dopant/Cs2CO3/Al。其中發光層的部分，我們分別利用PF2/6am4為主體材料， Bis(2-(9,9-dihexylfluorenyl)-1-pyridine)(acetylacetonate) iridium(III) 為摻雜材料，經適當的摻雜比後，可得到白色電激發光。以及使用碳酸銫(Cs2CO3)為陰極修飾材料來製作元件，利用此結構可以有效地提升白光高分子發光二極體的電流效率。在這個結構中，元件最高電流效率可達5.23cd/A。

In this study, highly efficient single-layer polymer light-emitting diodes (PLEDs) with white emission have been demonstrated. The device structure is ITO/PEDOT:PSS/Host:Dopant/Cs2CO3/Al, where the host material is poly[9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] end capped with N,N-Bis(4-methyl[henyl]-4-aniline (PF2/6am4); the Dopant is Bis(2-(9,9-dihexylfluorenyl)-1-pyridine)(acetylacetonate) irdium (III). After finely tuning of the dopant concentration, white emission has been achieved. It is also found that the device efficiency could be enhanced after the modification of the cathode with cesium carbonate (Cs2CO3). With this specific structure, the peak current efficiency of the white PLEDs can achieve as high as 5.23 cd/A.