Langer Jerzy J, Ratajczak Katarzyna, Frąckowiak Ewelina, Golczak Sebastian
Faculty of Chemistry, Laboratory for Materials Physicochemistry and Nanotechnology, A. Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 6, 61-614 Poznań, Poland.
ACS Omega. 2021 Dec 10;6(50):34650-34660. doi: 10.1021/acsomega.1c05051. eCollection 2021 Dec 21.
Tuning of the emission within the near-infrared to visible range is observed in -toluenesulfonic acid-doped polyaniline light emitting diodes (PANI/PTSA), when water molecules are absorbed by the active material (wet PANI/PTSA). This is a hybrid material that combines a conjugated π-electron system and a proton system, both strongly interacting in close contact with each other. The proton system successfully competes with the electron system in excitation energy consumption (when electrically powered), thanks to the inductive resonance energy transfer from electrons to protons in wet PANI/PTSA at the energy levels of combination of vibrations and overtones in water, with subsequent light emission. Wet PANI/PTSA, in which electrons and protons can be excited parallelly owing to fast energy transfer, may emit light in different ranges (on a competitive basis). This results in intense light emission with a maximum at 750 nm (and the spectrum very similar to that of an excited protonic system in water), which is blue-shifted compared to the initial one at ∼850 nm that is generated by the PANI/PTSA dry sample, when electrically powered.
当活性材料（湿的聚苯胺/对甲苯磺酸，即wet PANI/PTSA）吸收水分子时，在对甲苯磺酸掺杂的聚苯胺发光二极管（PANI/PTSA）中观察到发射光在近红外到可见光范围内的调谐。这是一种混合材料，它结合了共轭π电子体系和质子体系，两者在紧密接触时强烈相互作用。由于在水的振动和泛音组合能级上，湿的PANI/PTSA中电子到质子的感应共振能量转移，随后发光，质子体系在激发能量消耗（当供电时）方面成功地与电子体系竞争。在湿的PANI/PTSA中，由于快速的能量转移，电子和质子可以被平行激发，可能在不同范围内（在竞争基础上）发光。这导致在750nm处有最大发射的强烈发光（并且光谱与水中激发的质子体系的光谱非常相似），与干燥的PANI/PTSA样品在供电时产生的约850nm处的初始发射相比发生了蓝移。
