期刊
ADVANCED OPTICAL MATERIALS
卷 9, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100213
关键词
exciton coupling; merocyanine dyes; pigments; narrow bandwidth; organic photodiodes; social self‐ sorting
资金
- Projekt DEAL
Two dipolar merocyanines with the same chromophore but different alkyl substituents exhibit distinct packing arrangements in their solid state, resulting in ultranarrow absorption bands. Their self-sorting behavior in mixed thin films affects the opto-electronic properties. The tailored two-component material can optimize organic photodiodes with narrow bandwidths and high external quantum efficiency, suitable for applications such as low-power heart rate monitors.
Two dipolar merocyanines consisting of the same pi-conjugated chromophore but different alkyl substituents adopt very different packing arrangements in their respective solid state with either H- or J-type exciton coupling, leading to ultranarrow absorption bands at 477 and 750 nm, respectively, due to exchange narrowing. The social self-sorting behavior of these push-pull chromophores in their mixed thin films is evaluated and the impact on morphology as well as opto-electronical properties is determined. The implementation of this well-tuned two-component material with tailored optical features allows to optimize planar heterojunction organic photodiodes with fullerene (C-60) with either dual or single wavelength selectivity in the blue and NIR spectral range with ultranarrow bandwidths of only 11 nm (200 cm(-1)) and an external quantum efficiency of up to 18% at 754 nm under 0 V bias. The application of these photodiodes as low-power consuming heart rate monitors is demonstrated by a reflectance-mode photoplethysmography (PPG) sensor.
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