| 摘要註: |
本研究可分為二個部分，分別是第一部分的高顏色穩定度藍色有機發光元件和第二部分的高效率白光有機發光元件藉由使用三層電洞阻擋層(THBL)。首先，在第一部分藍色有機發光元件製作是使用2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)和(4,4’-N,N’-dicarbazole)biphenyl (CBP)組成三層電洞阻擋層，4,4'-bis(2,2'diphenylvinil)-1,1'-biphenyl (DPVBi)做為藍光發光層。不論施加的外加電壓增加，元件的發光效率利用THBL結構可以有效提升41%相比於雙層電洞阻擋層結構。利用THBL結構製作的元件CIE座標是(0.157, 0.111)接近純藍光的發光，而座標位移僅有±△x, y = (0.001, 0.008)在外加電壓6-9V。這個結果指出激子可以被有效限制在元件的發光層，使得亮度效率的提升和更穩定的座標。在第二部分的白色有機發光元件製作是利用THBL形成三明治結構並將黃光客體材料- Rubrene分別摻雜進入電洞阻擋層內。我們得到一個最佳的結構是Indium tin oxide (ITO)/ Molybdenum trioxide (MoO3) (5nm)/ [4,4-bis[N-(1-naphthyl)-N- phenylamino]biphenyl (NPB) (35nm)/ CBP (HBL1) (5nm)/ DPVBi (I) (10nm)/ CBP (HBL2): Rubrene (4:1) (3nm)/ DPVBi (II) (30nm)/ CBP (HBL3) (2nm)/ 4,7-diphenyl-1,10-phenanthroline (BPhen) (10nm)/ Lithium fluoride (LiF) / aluminum (Al)。結果顯示將Rubrene摻雜到HBL2展示一個穩定的白色發光與(0.322, 0.368)的顏色座標，和座標僅有輕微的位移±△x, y = (0.001, 0.011)在外加電壓8-12V。 This research includes two parts as mentioned: (I) high color stable blue organic emitting diodes and (II) high efficiency white organic emitting diodes by using triple hole blocking layer.In part (I), blue organic light-emitting diodes (OLEDs) with triple hole-blocking layer (THBL) structure, consist of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,4'-bis(2,2'diphenylvinil)-1,1'-biphenyl (DPVBi) and (4,4’-N,N’-dicarbazole)biphenyl (CBP), have been fabricated. Regardless of applied voltage variation, the luminance efficiency of the OLEDs with THBL structure was increased by 41% as compared with the dual hole-blocking layer (DHBL) structure. The CIE coordinates of (0.157, 0.111) of device with THBL structure is close to pure blue emission than that of other devices of DHBL. There is a coordinate with the slight shift of ±△x, y = (0.001, 0.008) for the device with THBL structure during the applied voltage of 6-9V. The results indicate that the excitons can be effectively confined in the emitting layer of device, leading to an enhancement of luminance efficiency and more stable coordinate.In part (II), the white organic light-emitting diodes with THBL formation sandwich structure which generate white emission were fabricated. The 5,6,11,12-tetraphenylnapthacene (Rubrene), CBP and DPVBi were used as emitting materials in the device. The function of CBP layer is not only an emitting layer but also a hole-blocking layer (HBL), and the Rubrene was doped into the CBP. The optimal configuration structure was indium tin oxide (ITO)/ Molybdenum trioxide (MoO3) (5nm)/ [4,4-bis[N-(1-naphthyl)-N- phenylamino]biphenyl (NPB) (35nm)/ CBP (HBL1) (5nm)/ DPVBi (I) (10nm)/ CBP (HBL2): Rubrene (4:1) (3nm)/ DPVBi (II) (30nm)/ CBP (HBL3) (2nm)/ 4,7-diphenyl-1,10-phenanthroline (BPhen) (10nm)/ Lithium fluoride (LiF) / aluminum (Al). The result showed that the device with Rubrene doped in CBP (HBL2) exhibited a stable white emission with the color coordinates of (0.322, 0.368), and coordinate with the slight shift of ±△x, y = (0.001, 0.011) for applied voltage of 8-12V was observed. |