近年來隨著磷光有機電激發光二極體(PhOLED)的蓬勃發展，在不同光色元件的研究上皆如火如荼地展開，其中高發光效率的藍光有機發光材料難以合成，導致目前藍光PhOLED相較於綠光及紅光PhOLED一直是處於發展最慢的一環。為了製作出高發光效率的PhOLED元件，
發光元件的薄膜表面形態便是相當重要的，由文獻中指出改變有機薄膜的沈積速率，是提升OLED元件的發光效率及元件電性的方法之一，於是我們選擇目前常用的磷光主體材料mCP及摻雜磷光客體材料FIrpic，作為藍光磷光有機電激發光二極體的發光層，並改變其元件沉積速率分別進行探討。
薄膜態其分子間距相較於溶液態更為靠近，於是我們比較溶液態及不同沈積速率的主體材料mCP薄膜的吸收光譜發現，mCP薄膜吸收光譜有紅位移的現象，在此我們推測為共軛長度的增加所導致。接著經由主體材料mCP在溶液態與不同沈積速率之薄膜的光激發光(PL)光譜實驗中，發現mCP薄膜態PL光譜除了主峰值(Peak)外，還有400 nm~500 nm的放光波段，這是許多文獻中未曾提及的放光波段，於是我們利用光激螢光激發(PLE)光譜進行判斷放光波段形成的原因，並推論mCP薄膜態此放光波段為聚集所造成，且在高沈積速率下，聚集的現象更為明顯，再者，隨著沈積速率的提高，mCP薄膜與具有摻雜客體材料的mCP薄膜的平均粗糙度也趨於平坦。
為了解mCP薄膜聚集的現象對於藍光元件的影響，當發光層高沈積速率(聚集越明顯)的情況下，藍光元件電性較好，且隨著沈積速率增加，藍光元件的發光亮度在一般照明應用亮度(1000 cd/m2)下，驅動電壓有明顯下降的趨勢，由於在高沈積速率時，聚集的情況較明顯，將導致藍光元件的發光層(主體材料mCP摻雜客體材料FIrpic)在主客體能量轉移上出現較多損耗，使得元件的外部量子效率低落，但在發光層沈積速率為3 A/s時，主體材料具有適當的聚集情況，將可改善藍光元件的電性，使得功率效率獲得了提昇(8.52 lm/W@1.2 mA/cm2)。

Phosphorescent organic light-emitting diodes (PhOLED) have attracted a lot of attention in these years.Blue PhOLED is especially important because of short lifetime and low optoelectronic performance as comparing to red and green PhOLEDs.Researches have shown that performance of OLED devices is highly rely on the deposition rate of organic materials ,which attest the morphology of organic layers.
To study how the deposition rate of host material on the performance of blue PhOLED,mCP is chosen a host material for a blue dopant - FIrpic and deposition rate of mCP on the performance of blue PhOLED performance is studied.
It was found that UV-Vis spectrum of mCP varied with different deposition rate.Additionally,an PL emission peak (400nm~500nm) appeared on the thermal evaporated mCP,which was possibly originated from the aggregation of mCP.Surface roughness of the evaporated mCP film became smaller as the deposition rate increased.A high performance (8.52 lm/W@1.2mA/cm2) is fabricated at a deposition rate at 3 A/s.

誌謝 I
中文摘要 II
Abstract IV
目錄 V
圖目錄 VIII
表目錄 XIII
第一章 緒論 1
1-1 有機電激發光二極體的發展與歷史進程 1
1-2 OLED元件的基本結構 3
1-3 OLED元件基本發光原理 5
1-4 磷光發光元件基本原理 9
1-5 有機電激發光元件材料介紹 14
1-5-1 電洞注入層材料 14
1-5-2 電洞傳輸層材料 15
1-5-3 電子傳輸層材料 15
1-5-4 主發光層材料 16
1-5-5 客發光體材料 17
1-6 OLED發光效率之定義和測量方法 19
1-7 OLED的色彩鑑定 23
第二章 理論基礎與實驗動機 26
2-1 有機電激發光之能量轉移機制 26
2-1-1 輻射能量轉移 28
2-1-2 非輻射能量轉移 28
2-2 濃度淬熄效應 30
2-3 三重態自我毀滅現象 32
2-4 文獻探討與實驗動機 34
第三章 實驗步驟及製程 37
3-1 實驗架構： 37
3-2 實驗藥品 38
3-3 實驗分析儀器 39
3-4 小分子OLED之製作流程介紹 48
3-4-1 基板ITO玻璃前處理 49
3-4-2 有機材料蒸鍍 53
3-4-3 陰極蒸鍍 59
3-4-4 封裝製程 60
3-5 元件製作與量測 61
第四章 結果與討論 64
4-1 主體材料之吸收與光激發光光譜量測 64
4-1-1 主體材料之不同濃度溶液及不同蒸鍍速率薄膜之吸收光譜量測 64
4-1-2 主體材料不同濃度溶液及不同蒸鍍速率薄膜之光激發光光譜量測 66
4-1-3 判斷為Excimer或Aggregation的影響 71
4-2 主體材料與發光層不同沈積速率表面型態分析 81
4-3 元件特性探討 86
4-3-1 元件結構 86
4-3-2 元件特性 88
第五章 總結 95
參考文獻 97

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