公开(公告)号：US20200270419A1

公开(公告)日：2020-08-27

申请号：US16648785

申请日：2018-10-19

Applicant: WAKAYAMA PREFECTURE

Inventor： Takeshi MORI ,  Tomohiro MORI ,  Akane SAITO ,  Hitoshi SAOMOTO

IPC: C08K5/3415 ,  C08J5/18 ,  C08K5/06 ,  B29D11/00

Abstract: Provided are a novel solid-based upconversion film having high emission efficiency and a method for producing the upconversion film. An upconversion film according to the present invention is a stretched film formed of a composition at least including an acceptor, a donor, and a matrix resin, wherein the matrix resin is a poly(vinyl alcohol)-based resin, and the matrix resin is oriented by stretching. A method for producing an upconversion film according to the present invention is a method for producing a photon upconversion film including a step of stretching a composition at least including an acceptor, a donor, and a matrix resin, wherein the matrix resin is a poly(vinyl alcohol)-based resin, and the stretching is wet-stretching in an aqueous solution of boric acid.