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Near-infrared absorbing cyanine dyes for all-organic optical upconversion devices

机译:用于全有机光学上转换器件的近红外吸收花青染料

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摘要

The development of near-infrared (NIR) photodetection technologies is driven by emerging applications such as medical imaging or optical sensors for electronic displays and machine vision. An all-organic upconverter (OUD) is a device that converts incident NIR light directly into visible light and consists of a monolithic stack of a NIR organic photodetector (OPD) and a visible organic light-emitting diode (OLED). We present OUDs that consist of NIR heptamethine cyanine dyes/C-60 fullerene OPDs and a fluorescent tris(8-hydroxyquinolinato)aluminium (Alq(3)) OLED. The device metrics of performance are a high external quantum efficiency (EQE) of 43% of the OPD part and an OUD luminance turn-on at low bias voltages of 2 V. The dynamic response of the photocurrent and luminance is linear over a NIR light range corresponding to 26 dB. These OUDs upconvert NIR light at 830 nm to green light with a photon-to-photon conversion efficiency of 0.61%, close to the expected maximum.
机译:近红外(NIR)光电检测技术的发展是由新兴应用推动的,例如医学成像或用于电子显示器和机器视觉的光学传感器。全有机上变频器(OUD)是一种将入射的NIR光直接转换为可见光的设备,由NIR有机光电探测器(OPD)和可见有机发光二极管(OLED)的单片堆叠组成。我们提出的OUD包括NIR七甲胺花青染料/ C-60富勒烯OPD和荧光三(8-羟基喹啉基)铝(Alq(3))OLED。器件的性能指标是OPD部分的43%的高外部量子效率(EQE)和2 V的低偏置电压下的OUD亮度开启。光电流和亮度的动态响应在NIR光下呈线性范围对应于26 dB。这些OUD将830 nm的NIR光上转换为绿光,光子到光子的转换效率为0.61%,接近预期的最大值。

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