Department of Electrical Engineering , Princeton University , Princeton , New Jersey 08544 , United States.
Department of Chemical and Biomolecular Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0100 , United States.
ACS Appl Mater Interfaces. 2018 Aug 22;10(33):28062-28068. doi: 10.1021/acsami.8b08181. Epub 2018 Aug 8.
We demonstrate phototriggered depolymerization of a low ceiling temperature ( T) polymer, poly(phthalaldehyde) (PPHA), via internal light emission from integrated organic light-emitting diodes (OLEDs) fabricated directly on flexible PPHA substrates with silver nanowire electrodes. The depolymerization of the PPHA substrates is triggered by absorption of the OLED emission by a sensitizer that activates a photoacid generator via energetically favorable electron transfer. We confirm with Fourier-transform infrared spectroscopy that the photon doses delivered by the integrated OLED are sufficient to depolymerize the PPHA substrates. We determine this critical dosage by measuring the operating lifetimes of the OLEDs whose failure is believed to be due to significant mechanical softening during the liquefaction of decomposed phthalaldehyde monomers.
我们通过直接在带有银纳米线电极的柔性聚邻苯二甲醛（PPHA）基底上制造的集成有机发光二极管（OLED）的内部光发射，展示了低玻璃化转变温度（Tg）聚合物聚邻苯二甲醛（PPHA）的光触发解聚。PPHA 基底的解聚是通过吸收 OLED 发射光来触发的，该发射光被敏化剂吸收，敏化剂通过能量有利的电子转移激活光酸产生剂。我们通过傅里叶变换红外光谱证实，集成 OLED 提供的光子剂量足以使 PPHA 基底解聚。我们通过测量 OLED 的工作寿命来确定这个临界剂量，我们认为 OLED 的失效是由于在分解的邻苯二甲醛单体的液化过程中发生了显著的机械软化。
