| Summary: | 碩士 === 國立交通大學 === 物理研究所 === 102 === The dissertation aims to successfully coat small molecule organic solution of low solubility by blade coating on a hot plate at different temperature, and fabricate blue fluorescence organic light-emitting diode with volatile solvent and different charge transporting layers in host-guest system of EB47 and EB515. We compared the variations in different device structures, and reduced the slight dissolution before tuning various thicknesses of organic films. The optimal device structure is 2,7-disubstituted fluorene-based triaryldiamine (VB-FNPD) and 2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) as hole transporting layer and electron transporting layer, respectively. Current efficiency of 3.4 cd/A, and external quantum efficiency of 1.6%, and luminance of 8,100 cd/m2 are achieved in this device structure. In the other experiment, we fabricated red phosphorescence organic light-emitting diodes in the same device structure and process of literature. The only variation is electron transporting layer coated by blade-only technique in place of evaporating in vacuum. After optimizing the thickness of CsF, current efficiency of 7.7 cd/A, and external quantum efficiency of 6.6%, and luminance of 920 cd/m2 are achieved in host-guest system of 4,4',4"-tris-(N-carbazolyl)-triphenylamine (TCTA) and [Os(btfp)2(pp2b)] (Osmium complex 2). The efficiency is over 40 percent of original evaporation process.
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