以電荷控制層改善熱活化延遲螢光白光有機發光二極體之演色穩定性及效率

High color stability and efficiency improvement of white light-emitting diode thermally activated delayed fluorescence by charge control layer

蔡政達

none ； none

義守大學電子工程學系學位論文

2017年

碩士

蘇水祥

繁體中文

本研究利用藍光熱活化延遲螢光發光材料10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (DMAC-TRZ)以及橘黃光磷光銥錯合物Iridium(III) bis (4-phenylthieno [3,2-c]pyridinato-N,C2′)acetylacetonate (PO-01)製作出白光有機發光二極體，藍光與橘黃光發光層皆以非摻雜方式製作。藍光熱活化延遲螢光(DMAC-TRZ)之EL光譜波峰位於504 nm，而橘黃光發光層之EL頻譜波峰位於560 nm，利用藍光及橘黃光雙發光層並藉由使用電荷控制層(Charge control layer, CCL)概念，提升白光有機發光二極體之色穩定性。 首先，探討藍色發光層與橘黃光發光層最佳厚度及其結構上加入電荷控制層後載子的傳輸機制，進而研究使用不同材料混合比例之電荷控制層對元件特性的影響。 實驗結果顯示在客體材料最佳厚度下，優化電荷控制層厚度與不同材料比例，成功製作具有演色穩定性之白光有機發光二極體元件，元件結構為 ITO/MoO3(1 nm)/TAPC(50 nm)/mCP(10 nm)/DMAC-TRZ(8 nm)/mCP:3TTPYMB(1:0.2)(2 nm)/PO-01(0.1 nm)/3TPYMB(50 nm)/LiF/Al，此元件最大發光效率為8.24 cd/A、最大亮度 2567 cd/m2、色座標CIE(0.33, 0.51)，其CIE變化值僅為(±0.01, ±0.01)具演色穩定性。

In this study, we fabricated hybrid white organic light-emitting diodes (WOLEDs) with a blue thermally activated delayed fluorescent (TADF) emitter 10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (DMAC-TRZ) and yellow phosphorescent iridium complexes Iridium(III) bis (4-phenylthieno [3,2-c]pyridinato-N,C2′) acetylacetonate (PO-01). The blue and yellow emitting layers are fabricated by non-doped process. The peaks of electroluminescent (EL) spectrum locate at 504 nm of DMAC-TRZ and 560 nm of PO-01. The device color stability was enhanced by inserting a charge control layer (CCL) between the two emitting layers. The thicknesses of blue and yellow emitting layers are optimized and the carrier transporting mechanism of CCL is discussed. Afterward, the mixing ratio of mCP and 3TTPYMB in CCL is modified to observe the luminous characteristics. Optimized device structure is ITO/MoO3(1 nm)/TAPC(50 nm)/mCP(10 nm)/DMAC-TRZ(8 nm)/mCP:3TTPYMB(1:0.2)(2 nm)/PO-01(0.1 nm)/3TPYMB(50 nm)/LiF/Al. The maximum luminous efficiency of 8.24 cd/A, and luminance of 2567cd/m2 have been achieved. Its CIE coordinates locate at (0.33, 0.51) and vary within (±0.01, ±0.01).

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