Media type: E-Article Title: Effect of Crystallinity in Stretched PVA Films on Triplet–Triplet Annihilation Photon Upconversion Contributor: Mori, Tomohiro; Mori, Takeshi; Fujii, Akira; Saito, Akane; Saomoto, Hitoshi; Kamada, Kenji imprint: American Chemical Society (ACS), 2020 Published in: ACS Applied Polymer Materials Language: English DOI: 10.1021/acsapm.0c00020 ISSN: 2637-6105 Keywords: Organic Chemistry ; Polymers and Plastics ; Process Chemistry and Technology Origination: Footnote: