有機發光二極體元件由於可應用於平面顯示技術，具有質輕、自發光、可在室溫下利用濕式製程…等優點，近年來受到廣泛的研究。其中，利用摻雜含有重原子的磷光材料的發光元件特別受到矚目。因為磷光材料中利用重原子擁有強烈的自旋-軌道耦合(spin-orbit coupling)有效地混合單重態和三重態，因此充分利用了激發三重態的能量，可以有效的提高有機電激發光元件的外量子效率。

　　本研究中將探討紅色磷光材料－dibenzo[f,h]-quinoxaline Iridium(Ⅲ) (acetylacetonate) [Ir(DBQ)2(acac)]摻雜於高分子發光元件之光電特性研究，內容將分為兩部分：第一部部分將利用電子傳輸材料PBD不同的摻混比例在相同的高分子基材-PVK的條件下，探討在不同的磷光材料摻雜濃度下對元件的影響；第二部分以非共軛型高分子－PVK與共軛型高分子－PF作為基材，在摻雜相同電子傳輸材料-PBD的條件中，製作不同變數的元件探討在不同的磷光材料濃度摻雜下對元件的影響。

　Researches on polymer light-emitting diodes (PLEDs) were focused on the improvement of the efficiency. According to simple statistics, the process of charge injection and recombination in PLEDs generates singlet excitons with quantum efficiency of only 25% limited the efficiency of PLEDs based on fluorescent polymers.

　Phosphorescent materials have attracted great attention due to the potential that can overcome the efficiency limit. It is because that these materials incorporate a heavy metal atom to mix singlet and triplet states by the strong spin-orbit coupling. As a result, a spin forbidden transition may occur allowing an enhanced triplet emission, and therefore it can reach 100% internal quantum efficiency principally.
In this study, the phosphorescent material, dibenzo[f,h]-quinoxaline iridium(Ⅲ) (acetylacetonate) [Ir(DBQ)2(acac)], was doped into different host systems. We studied the concentrations effects of electron transport material, 2-(4-biphenylyl)-5-(4-tert-butyl-phenyl)-(1,3,4-oxadiazole) (PBD) and Ir(DBQ)2(acac), which were doped into hosts. We also investigated using non-conjugated polymer, ploy(N-vinyl caebarzole)[PVK], and a conjugated polymer, poly (fluorene) based derivative [PF] as host to affect devices performance. From our results, the high efficiency electrophosphorescent light-emitting devices can be developed by suitable Ir complex、host, and dopants concentration.

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