Cellulose Based Photonic Materials Displaying Direction Modulated Photoluminescence


Photonic materials featuring simultaneous iridescence and light emission are an attractive alternative for designing novel optical devices. The luminescence study of a new optical material that integrates light emission and iridescence through liquid crystal self-assembly of cellulose nanocrystal-template silica approach is herein presented. These materials containing Rhodamine 6G were obtained as freestanding composite films with a chiral nematic organization. The scanning electron microscopy confirms that the cellulose nanocrystal film structure comprises multi-domain Bragg reflectors and the optical properties of these films can be tuned through changes in the relative content of silica/cellulose nanocrystals. Moreover, the incorporation of the light-emitting compound allows a complementary control of the optical properties. Overall, such findings demonstrated that the photonic structure plays the role of direction-dependent inner-filter, causing selective suppression of the light emitted with angle-dependent detection.

subject category

Biotechnology & Applied Microbiology; Multidisciplinary Sciences


Santos, MV; Maturi, FE; Pecoraro, E; Barud, HS; Lima, LR; Ferreira, RAS; Carlos, LD; Ribeiro, SJL

our authors


This work was supported by the Brazilian agencies CAPES and Sao Paulo Research Foundation, grants #2014/12424-2 and #2016/11591-8. Institute of Science and Technology-CNPq-Brazil was also acknowledged for financial support. Fundacao para a Ciencia e a Tecnologia, FEDER, COMPETE (UIDB/50011/2020 and 50011/2020) are acknowledged as well.

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