溶液製程製作混合型白光有機發光二極體

Abstract

有機發光二極體近來已成為國內外非常熱門的平面顯示器產業，而在製程的技術上，在業界通常都使用蒸鍍製程，但大尺寸的真空蒸鍍設備本身成本較高，且有機材料大多在蒸鍍的過程中沉積在真空系統的腔壁上造成浪費，因此用溶液製程取代蒸鍍製程是一個節省成本的方式，而且相較於蒸鍍製程，溶液製程的時間相對的也節省很多，對於有機發光二極體的製作可說是十分的理想。磷光型的有機發光二機體雖然有較高的效率，但壽命相較於全螢光的有機發光二極體低很多，而螢光型的有機發光二極體發光效率太低，尤其是藍光的有機發光材料，因此製作混合型的有機發光二極體能夠擷取螢光跟磷光兩種有機材料的優點，擁有較長的壽命跟較好的效率。本論文利用刮刀塗佈技術製作雙發光層混合型白光元件，以磷光橘光有機材料PO-01-TB搭配螢光藍光有機材料BCzVBi當作雙發光層，並使用CBP當主體發光材料，電洞傳輸層使用NPB，電子傳輸層使用TPBi，以ITO當陽極，LiF/Al當陰極，進而完成一個下發光元件。最大的電流效率為10.1 cd/A、最大的EQE為3.2 %，1000 nits亮度下，元件亮度功率效率為1.5 lm/w，而CIE座標在1000 nits亮度時為(0.37 0.39)。

Organic light emitting diode has recently become very popular in domestic flat panel display industry, and the manufacturing process technology in the industry typically use evaporation process. But the large size of the high cost of vacuum deposition equipment itself. The organic material most deposited during the deposition of the cavity wall in the vacuum system wasteful process therefore replaced with the solution process is a cost-effective way, and compared to the evaporation process. The solution processes also save a lot of time, the organic light-emitting diodes can be said that the production of very satisfactory. Phosphorescent organic light-emitting device has a higher efficiency, but it’s life time compared with fluorescent organic light-emitting diode is much lower. The fluorescence-based organic light-emitting diode efficiency is too low, especially the blue organic light-emitting material, so the production of mixed type the organic light-emitting diode with the phosphorescent phosphor to capture the advantages of two organic materials, has a long life time with better efficiency. In this thesis, blade coating technology produces a pair of mixed type white light-emitting layer components to phosphorescent orange organic material Iridium(III) bis(4-(4-t-butylphenyl)thieno[3,2-c]pyridinato-N,C2’) acetylacetonate (PO-01-TB)with fluorescent blue organic light-emitting layer material 4,4'-bis(9-ethyl-3-carbazovinylene)-1,1'-Biphenyl (BCzVBi) as pairs and use the 4,4'-bis(carbazol-9-yl)biphenyl (CBP) as the host materials, electric hole transport layer using N,N'-bis(naphthalen- 1-yl)-N,N'-bis(phenyl)-benzidine (NPB), electron transport layer using 2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)(TPBi), with ITO as an anode, LiF / Al as the cathode, and then complete the bottom-emitting organic light-emitting device. The maximum current efficiency of 10.1 cd/A, the maximum EQE of 3.2 %, the power efficiency of 1.5 lm/w at the luminance of 1000 nits. The Commission Internationale de’lEclairage(CIE) coordinates is (0.37 0.39) at 1000 nits.