One-Step Synthesis of Eu3+-Modified Cellulose Acetate Film and Light Conversion Mechanism

Zhihui Zhang; Zhengdong Zhao; Yujia Lu; Di Wang; Chengyu Wang; Jian Li

doi:10.3390/polym13010113

One-Step Synthesis of Eu³⁺-Modified Cellulose Acetate Film and Light Conversion Mechanism

Polymers (Basel). 2020 Dec 30;13(1):113. doi: 10.3390/polym13010113.

Authors

Zhihui Zhang^{1

2

3}, Zhengdong Zhao^{1

2

3}, Yujia Lu^{1

2

3}, Di Wang^{1

2

3}, Chengyu Wang^{1

2

3}, Jian Li^{1

2

3}

Affiliations

¹ Engineering Research Center of Advanced Wooden Materials (Ministry of Education), Northeast Forestry University, Harbin 150040, China.
² Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China.
³ Collage of Material Science & Engineering, Northeast Forestry University, Harbin 150040, China.

Abstract

A CA-Eu(III) complex was synthesized by the coordination reaction of cellulose acetate (CA) and Eu³⁺ to obtain a CA-Eu light conversion film. This product was then doped with Tb(III) to sensitize the luminescence of Eu³⁺, which could functionalize the CA film. FTIR and XPS showed that the oxygen atoms in C=O, C-O (O=C-O), and O-H were involved in the complexation with Eu³⁺ and formed a Eu-O bond. SEM revealed that Eu³⁺ filled in the pores of the CA film. By changing the experimental conditions, the best fluorescence performance was obtained at the CA: Eu³⁺ ratio of 3:1 with a reaction time of 65 min. The energy transfer between Tb³⁺-Eu³⁺ could be realized by doping Tb³⁺ to enhance the luminescence of Eu³⁺. The best fluorescence performance of the CA-Eu-Tb light conversion film was at a Eu³⁺:Tb³⁺ ratio of 3:1. Compared with the CA film, the light conversion film has high transparency, high tensile strength, and good flexibility. It can convert the ultraviolet light harmful to plants into red light that is beneficial to photosynthesis. This offers high efficiency and environmental protection in the field of agricultural films.

Keywords: cellulose acetate; europium; light conversion film; sensitization.

Abstract

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