| Summary: | 碩士 === 國立交通大學 === 應用化學系所 === 93 === ADN is one of the most widely used blue host materials in Organic Light Emitting Devices (OLED). However the poor thermal stability of the thin films may short the lifetime and stability of the devices. In order to enhance the thin-film morphological stability,we decided to introduced substituents at C-10 position and tetraphenylsilane at C-9 position of anthracene. Owing to the starbust moiety of silane, we can disrupt the molecular symmetry. In this thesis, we synthesized [4-(9-anthryl)phenyl]-triphenyl Silane (ASi)、triphenyl-4-(10- phenyl-9-anthryl)phenyl Silane (PASi)、{4-[10-1-naphthyl]-9-anthryl}phenyl}- triphenyl Silane (1-NASi) and {4-[10-2-naphthyl]-9-anthryl}phenyl}-triphenyl Silane (2-NASi). By the atomic force microscopy (AFM), these thin-film morphology of PASi、1-NASi and 2-NASi are very smooth without any sign of crystallization after annealing at 95 oC for 1 hour as contrasted to what were observed for ADN and ASi.
In order to lower the power consumption in making full color display, the color saturation is a crucial factor especially for deep blue OLED. High color saturation and stable thin film character can be achieved by using the series of host materials mentioned above in blue devices. Among those host materials, 1-NASi has the most saturated blue color. The undoped host achieved a luminance efficiency of 1.96 cd/A with a CIEx,y coordinate of (0.15, 0.06). When doped with SA-biph, it achieved a luminance efficiency of 1.96 cd/A with a CIEx,y coordinates of (0.15, 0.11).
We have synthesized a new deep blue dopant {4-[2-(tetraphenylsilyl-phenyl) vinyl]-phenyl}-biphenyl amine (Si-Nbiph) based on organic Silane fluorescent dye and modified the styrylamine-based blue dopant p-bis(p-N,N-diphenyl -aminostyryl)benzene (DSA-Ph) by replacing triphenylamine with Silane. Owing to the steric hindered characteristic of silane moiety, the problem of dopant concentration quenching can be suppressed. When Si-Nbiph was doped up to 15% in the stable blue host material 2-methy-9,10-di(2-naphthyl)
anthracene (MADN), the blue devices were achieved a luminance yield of 3.93 cd/A at 20 mA/cm2 with a near saturated CIEx,y 1931 color coordinate of (0.15, 0.15).
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