Effect of Crystallinity in Stretched PVA Films on Triplet–Triplet Annihilation Photon Upconversion,ACS Applied Polymer Materials

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Effect of Crystallinity in Stretched PVA Films on Triplet–Triplet Annihilation Photon Upconversion
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-03-06 , DOI: 10.1021/acsapm.0c00020
Tomohiro Mori ₁ , Takeshi Mori ₁ , Akira Fujii ₁ , Akane Saito ₁ , Hitoshi Saomoto ₁ , Kenji Kamada ₂

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A wet-stretching technique was applied to chromophore-blended poly(vinyl alcohol) (PVA) films to control the agglomeration of chromophores and improve the triplet–triplet annihilation (TTA) photon upconversion (UC) performance of the solid-state system. By using the stretching technique, a maximum UC quantum yield of ∼3% and lowest threshold intensity of 90 mW/cm² were obtained under atmospheric conditions. It was found that a decrease in the crystallinity of the PVA matrix induced by stretching caused specific localization of the chromophores and accelerated triplet energy transfer and triplet exciton migration.

中文翻译：

PVA拉伸薄膜的结晶度对三重态-三重An灭光子上转换的影响

将湿拉伸技术应用于生色团混合的聚乙烯醇（PVA）膜，以控制生色团的聚集并改善固态系统的三重态-三重态an灭（TTA）光子上转换（UC）性能。通过使用拉伸技术，在大气条件下获得的最大UC量子产率约为3％，最低阈值强度为90 mW / cm ²。发现由拉伸引起的PVA基质的结晶度降低引起发色团的特定定位并加速了三重态能量转移和三重态激子迁移。

更新日期：2020-04-23

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