Investigation on Organic Electroluminescent Diode as New Optical Source

有机电致发光二极管新型光源的研究

• 批准号: 14550339
• 负责人: OKADA Kazuyuki
• 金额: $ 1.41万
• 依托单位: KINKI University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550339/
• 关键词: Optical Device; Organic Thin Film; Display

The organic electroluminescent(EL) diode was progressively developed as a display device. In this application, we utilize the lights emitted to the normal direction of the planar EL diode. As the lights are isotropically generated in the organic layer, some of the lights can propagate to the tangential direction and emit from the side end of the device. In this research, the spectrum, angular distribution and polarization of the lights emitted from the side end of the EL diode were experimentally observed and investigated in comparison with those in the normal direction.(1)Spectral featuresThe wavelength at the peak intensity in the emission spectrum from the side end was shorter than that in the normal direction. The spectral width of the lights from the side end was narrower compared with that in the normal direction. These spectral characteristics were obviously observed in the device of the emission area size of 6mm.(2)Angular distributionThe lights from the side end of the EL diode with the emission area size of 6mm were observed to be strongly emitted to the direction of 40 degree away from the tangential direction. In the device with narrower emission area, the direction angle of the strong emission was larger than 40 degree. With longer emission wavelengths, this angle was shifted to the smaller one. We expect that these charactristics are related to the light propagation in the EL diode.(3)Polarization characteristicsThe lights emitted to the normal direction were not polarized, but the lights from the side end were slightly polarized in the normal direction of the EL diode. This polarization characteristics was similar to that in different color EL diode.

有机电致发光(EL)二极管逐渐发展成为一种显示器件。在这个应用中，我们利用发射到平面EL二极管法线方向的光。由于光是在有机层中各向同性地产生的，所以一些光可以传播到切向方向并从器件的侧端发射。实验观察和研究了EL二极管侧端发射光的光谱、角分布和偏振特性，并与法向发射光进行了比较。(1)光谱特性侧端发射光谱中峰值强度处的波长比法向发射光谱的峰值波长短。从侧端发出的光的光谱宽度比法线方向的窄。在发射区尺寸为6 mm的器件中观察到明显的光谱特性。(2)角分布观察到发射区尺寸为6 mm的EL二极管侧端发出的光强烈地向远离切向40度的方向发射。在发射面积较窄的器件中，强发射的方向角大于40度。随着发射波长的增加，这个角度会移动到较小的角度。我们认为这些特性与光在EL二极管中的传输有关。(3)偏振特性在垂直方向发射的光没有偏振，但从侧端发出的光在EL二极管的法向略有偏振。这种偏振特性与不同颜色的EL二极管的偏振特性相似。

项目成果

Tetsuo Tsutsui, Noriyuki Takada, Shogo Saito, Etsuo Ogino: "Sharply directed emission in organic electroluminescent diodes with an optical-microcavity structure"Appl.Phys.Lett.. 65(15). 1868-1870 (1994)

Tetsuo Tsutsui、Noriyuki Takada、Shogo Saito、Etsuo Ogino：“具有光学微腔结构的有机电致发光二极管中的锐定向发射”Appl.Phys.Lett.. 65(15)。

Naotoshi Suganuma, Chihaya Adachi, Toshiki Koyama, Yoshio Taniguchi, Hiroshi Shiraishi: "A 200nm×2mm array of organic light-emitting diodes and their anisotropic electroluminescence"Appl.Phys.Lett.. 74(9). 1206-1208 (1999)

Naotoshi Suganuma、Chihaya Adachi、Toshiki Koyama、Yoshio Taniguchi、Hiroshi Shiraishi：“有机发光二极管及其各向异性电致发光的 200nm×2mm 阵列”Appl.Phys.Lett.. 74(9) (1999)。