Photodynamics of Organic Thin Film Multilayer Struvtures with Optical Functions

具有光学功能的有机薄膜多层结构的光动力学

基本信息

批准号：
11450013
负责人：
FUJITA Shizuo
金额：
$ 5.89万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450013/
关键词：
organic materials multilayer structures HOMO energy LUMO energy photodynamics radiative recombination lifetime exciton localization white EL 光タイナミクス Alq TPD PBD

项目摘要

This research was carried out aimed at developing a new material structure with novel optical functions, i.e., organic thin film multilayer structures, through critical characterization of their photodynamics. The results are summarized as follows ;1. Organic materials for electroluminescence (EL) applications were chosen as target for this reserach. Well-defined multilayer structures with aluminumquinoline (Alq3), diamine (TPD), oxadiazole (PBD), and cyclopentadiene (PPCP) were fabricated by molecular beam deposition technique with the controllability of smaller than 20Å, which was proven by x-ray diffraction and non-contact mode atomic force microscopy.2. Techniques for elucidating energy structures of organic materials were developed by using UPS, excitation PL, and photoabsorption characteristics. The results revealed type-II energy lineup with respect to HOMO and LUMO levels for Alq/TPD and Alq/PPCP and type-I for Alq/PBD.3. Photodynamics characterization conditions with time-resolved PL were established and with this technique fast (within few ps) energy transfer of photoexcited carriers to Alq followed by effective radiative recombination in type-I structures and separation of electrons and holes in different layers in type-II structures were evidenced.4. Doping of C60 into electron transport layers enhanced electron mobility and this successfully improved the efficiency of EL devices where electron mobility dominated the total efficiency.5. Based on the photodynamics revealed in this study, novel structures for EL devices were newly proposed and actually contributed to improvement of efficiency of green EL devices and visibility of white EL devices.

这项研究的目的是通过对光学动力学的批判性表征来开发具有新型光学功能（即有机薄膜多层结构）的新材料结构。结果总结如下; 1。选择电致发光（EL）应用的有机材料作为这项研究的靶标。通过分子束沉积技术制造了具有铝喹啉（ALQ3），二氨酸（TPD），氧化二唑（PBD）和环戊烷（PPCP）的明确定义的多层结构，该结构是通过分子束沉积技术制造的，具有小于20Å的可控性，该技术的可控性是X-Ray diffraction和dy-difactict crictiction.2 arecopeciper的可控性。通过使用UPS，兴奋性PL和光吸附特性，开发了有机材料的能量结构的技术。结果揭示了ALQ/TPD和ALQ/PPCP的HOMO和LUMO水平的II型能量阵容以及ALQ/PBD.3的I型。建立了具有时间分辨PL的光动力学表征条件，并通过该技术快速（少数PS）将光激发载体的能量转移到ALQ，然后在类型I型结构中有效地辐射重组，并证明了II类型II型中电子和孔在不同层中的分离。4。将C60掺入电子传输层增强了电子迁移率，这成功提高了电子迁移率主导总效率的EL设备的效率。5。基于本研究中揭示的光动力学，新提出了EL设备的新结构，并实际上有助于提高绿色EL设备的效率和白色EL设备的可见性。