To harvest the full potential of polymer-based solid-state photon upconversion (UC) devices, we examined the effect of the molecular weight of a fluorescent polymer on the UC efficiency. With a high-molecular-weight polymer, a long triplet lifetime of 11.2 ms was achieved, which led to a characteristic threshold intensity of 67 mW cm(-2), considerably lower than those of previously reported polymer-based UC devices. Furthermore, the external quantum efficiency of our UC device was as high as similar to 0.35. Consequently, fluorescent conjugated polymers with long triplet lifetimes can serve as attractive candidates for efficient solid-state UC devices.
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机译：为了充分挖掘基于聚合物的固态光子上转换（UC）器件的潜力，我们研究了荧光聚合物分子量对UC效率的影响。使用高分子量聚合物时，实现了 11.2 ms 的长三重态寿命，这导致特征阈值强度为 67 mW cm（-2），远低于先前报道的基于聚合物的 UC 器件。此外，我们的UC设备的外部量子效率高达0.35%。因此，具有长三重态寿命的荧光共轭聚合物可以作为高效固态UC器件的有吸引力的候选者。
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