Date

Place

Room H (Room Hall 1, 1F)
P2. Poster Session II
August 21, 2015 (Friday)
14:00 ~ 15:30

[P2-128]
14:00 ~ 15:30
Title:Preparation and Characterization of the New Hole-Transporting Material for Vacuum-Deposited Green Phosphorescent OLEDs
Hyejin Na, Hyun Han (KRICT, Korea), Sunghyun Son (Univ. of Seoul, Korea), Changsik Song (Sungkyunkwan Univ., Korea), Byung Jun Jung (Univ. of Seoul, Korea), and Jaemin Lee (KRICT, Korea)
Abstract: In the research of organic electronics materials, organic light-emitting diode (OLED) is one of the example of actual commercialization, which enables the realization of ultra-thin and flexible displays. To improve the device performance, each of the functional layers in OLEDs, e.g., hole-transporting layers (HTLs), emitting layers (EMLs), and electron-transporting layers (ETLs), should be carefully combined, and of course, the characteristics of each of the layer can be easily tuned by selecting proper materials.1 Among various layers and materials in OLEDs, HTLs are important to reduce the driving voltage, and to increase the efficiency of the device. However, from the viewpoint of the chemical structures, most of the hole-transporting materials (HTMs) in current OLEDs are limited to arylamine derivatives2, and new innovative design of HTMs is still so necessary. In this work, we designed and synthesized a new kind of HTM for vacuum-deposited green phosphorescent OLEDs. The chemical structures of the new material were confirmed by 1H and 13C NMR spectroscopy, and high-resolution mass spectroscopy. The new material was thermally stable up to more than 300 oC which was confirmed by TGA and DSC. The optical properties of the new material were characterized by UV-vis. and PL spectroscopy, and the triplet energy level of the new material was as high as 2.6 eV, which is high enough for green phosphorescence. The OLED device using the new HTM outperformed the control devices using NPB or TAPC as HTMs, and it showed a maximum current efficiency higher than 60 cd/A. Detailed characterization and OLED device results will be discussed in the presentation.
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