本論文是以串座的概念，製作倒置型串座式(tandem)有機發光二極體(Organic light emitting diode；OLED)元件，將上、下兩個相同的高效率綠光元件，以複合式連接層連接起來，與傳統的有機電激發光二極體元件比較，在相同的電流密度下，串座式元件擁有較高的發光效率。本實驗室原未發展過串座式元件，此串座元件的開發則針對串座平台的建立，以及高效率串座元件兩大重點進行研究探討，本論文實驗主軸主要分為：首先，以磷光材料Ir(ppy)3做為磷光電激發光材料，經由材料挑選與最佳化，製作出高效率綠光有機發光二極體。然後，藉由文獻探討做為參考，選用多種不同結構做為串座式元件的連接層，進行連接層研究與串座式結構建立，製作出高效率串座式綠光元件。最後，針對Metal Oxide/Metal/Metal Oxide的結構進行，穿透及電容分析，確立此結構能有效運用於串座元件。
（Ⅰ）經由材料挑選、能階匹配、發光層之摻雜濃度、厚度最佳化後的元件，其發光效率在1000 cd/m2的亮度下，驅動電壓為4.1 V，電流效率67.3 cd/A；在10000 cd/m2的亮度下，驅動電壓為5.3 V，電流效率可達到58.3 cd/A。以上特性表現在小分子磷光綠光系統裡都是非常出色的。
（Ⅱ）藉參考文獻選用多種不同連接層結構先進行串座綠色發光元件，先根據光電分析來確立連接層是否能有效運作。再進行厚度最佳化，成功的建立了新式的連接層結構，其串座效果，可達到理論電流效率疊加之效果。
（Ⅲ）在有良好基本元件以及確定連接層結構後，並成功地將標準元件與連接層做結合，串座出高效率之綠光元件。針對新式連接層結構進行穿透及載子產生分析，確立能有效運用於串座元件上。

This thesis is based on the concept of tandem structure. We has demonstrated high efficiency green organic light-emitting diode(OLED) with tandem structure. We investigated the charge generation characteristics of intermediate layer, consisting of conbination of dieletric material and metal muitilayer for a stacked organic light-emitting device. We utilized identical colors of green phosphorescent emitters to obtain high efficiency green electroluminescence. Compared with the traditional Organic light emitting diode, at the same current density, the stacked devices have higher efficiency in emitting. The research of stacked device mainly focuses on two points: the establishment of the connecting platform and high-efficiency stacked device. The themes of experiments in the thesis are: First,we choose phosphorescent material Ir(ppy)3 as the material of electrophosphorescence, and make high-efficiency organic green emitting diode by the selection of materials and optimization.Then,by the review of paper, I select many types as the connecting layers of stacked device. In the meantime, we can optimize the device, and to take a step further, manufacture the high-efficiency stacked green emitting devices.Finally,through the combination of high-efficiency green emitting standard device and stacked structure. We analyzed the connection layer penetration and capacitance.
（Ⅰ）When the emitting efficiency of the devices which passed the selections of materials, the match of energy level, the modulation of concentration in emitting layer, and the optimization of thickness , exhibited excellent performance. The current efficiency and driving voltage at 1000 cd/m2 of the standard units have reached 67.3 cd/A and 4.1 V, respectively. When it reached 10000 cd/m2, the driving voltage is 5.3 V, and the current efficiency is 58.3 cd/A. The above-mentioned performances are spectacular in sphere of small-moleculed phosphorescent green emitting system.
（Ⅱ）We make the devices before and after connecting layer have charge and recombine to emit by stacking green emitting device by optical analysis. Afterward, we select Metal Oxide/Metal/Metal Oxide as the connecting layer, optimize thickness and successfully and establish the manufacturing platform of stacked devices. The result of stacking can reach the effect in the theory of stacked current efficiency.
（Ⅲ）By analyzing the penetration and capacitors, we identified a composite connection layer can produce charges and successfully connect high-efficiency tandem devices.

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