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Research on novel organic nano-optical materials operating in invisible wavelength regions

不可见波长区新型有机纳米光学材料的研究

基本信息

批准号：
18560354
负责人：
OHTANI Naoki
金额：
$ 2.28万
依托单位：
Doshisha University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560354/
关键词：
Oreanic LEDs Effective mass Quantum wells 紫外線紫外高分子蛍光材料薄膜 PCA キャリア輸送

项目摘要

The purpose of this research is to develop organic light-emitting diodes (OLEDs) operating in invisible wavelength regions such as ultraviolet and infrared. We investigated optical properties of organic multiple-thin layers and multiple-quantum well (MQW) structures. The MQW structures consist of two organic low-weight-molecule materials, DCM and TPD. We found that the peak-generating wavelength in photoluminescence (PL) spectra exhibits to be shortened due to quantum size effect in DCM/TPD MQWs. This quantum size effect was also observed in electroluminescence (EL) spectra. The subband energies of electrons in DCM/TPD MQWs are determined by numerical calculation in the context of envelope function approximations. From this, we successfully estimated the effective mass of electrons in DCM QWs as to be about 0.5m_0.We fabricated polymer LEDs (PLEDs) by using a polymer material, PCA, which has the maximum absorption coefficient in the ultraviolet region. A PL spectrum of PCA reveals three peak-generating wavelengths, 395, 510 and 650 nm. This indicates that ultraviolet PLEDs can be fabricated if high-effective carrier injection into the radiative site of 395-nm is realized. The PLED consisting of a PCA single layer exhibits a light emission at 650 nm. However, by introducing a hole-transport layer, the PLED exhibits a light emission at 510 nm.These results indicate that emission wavelengths of OLEDs can be artificially controlled by using organic MQW structures. In addition, we also found PLEDs consisting of a TPD-doped PCA active layer are useful to control the emission wavelength of PLEDs.

本研究的目的是开发在紫外和红外等不可见波长区域工作的有机发光二极管（OLED）。我们研究了有机多层薄膜和多量子阱结构的光学性质。MQW结构由两种有机低分子材料DCM和TPD组成。我们发现DCM/TPD多量子阱的光致发光（PL）谱中的峰值产生波长由于量子尺寸效应而缩短。这种量子尺寸效应在电致发光（EL）光谱中也被观察到。在包络函数近似下，通过数值计算确定了DCM/TPD多量子阱中电子的子带能量。由此，我们成功地估算出DCM量子阱中电子的有效质量约为0.5m_0。我们采用在紫外区具有最大吸收系数的聚合物材料PCA制备了聚合物发光二极管（PLED）。PCA的PL光谱揭示了三个峰产生波长，395，510和650 nm。这表明，紫外PLEDs可以制作，如果实现高效的载流子注入到395 nm的辐射位置。由PCA单层组成的PLED在650 nm处表现出光发射。然而，通过引入空穴传输层，PLED在510 nm处显示出发光。这些结果表明，OLED的发射波长可以通过使用有机多量子阱结构来人为控制。此外，我们还发现由TPD掺杂的PCA活性层组成的PLED对于控制PLED的发射波长是有用的。