Photon upconverting bioplastics with high efficiency and in-air durability

Pankaj Bharmoria, Shota Hisamitsu, Yoichi Sasaki, Tejwant Singh Kang, Masa Aki Morikawa, Biplab Joarder, Kasper Moth-Poulsen, Hakan Bildirir, Anders Mårtensson, Nobuhiro Yanai, Nobuo Kimizuka

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


There is an urgent demand for substituting synthetic plastics to bioplastics for sustainable renewable energy production. Here, we report a simple one-step approach to create bioplastics with efficient and durable photon upconversion (UC) by encapsulating non-volatile chromophore solutions into collagen-based protein films. By just drying an aqueous solution of gelatin, surfactant, and UC chromophores (sensitizer and annihilator), liquid surfactant microdroplets containing the UC chromophores are spontaneously confined within the gelatin films. Thanks to the high fluidity of microdroplets and the good oxygen barrier ability of the collagen-based fiber matrices, a high absolute TTA-UC efficiency of 15.6% and low threshold excitation intensity of 14.0 mW cm−2are obtained even in air. The TTA-UC efficiency was retained up to 8.2% after 2 years of storage under ambient conditions, hence displaying the significant durability desired for practical applications.

Original languageEnglish
Pages (from-to)11655-11661
Number of pages7
JournalJournal of Materials Chemistry C
Issue number35
Publication statusPublished - Sept 21 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Materials Chemistry


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