Cellulose Based Photonic Materials Displaying Direction Modulated Photoluminescence

authors	Santos, MV; Maturi, FE; Pecoraro, E; Barud, HS; Lima, LR; Ferreira, RAS; Carlos, LD; Ribeiro, SJL
nationality	International
journal	FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
author keywords	bacterial cellulose nanocrystals; chiral nematic liquid crystal; iridescence; photonic materials; luminescence; modulated light emission; rhodamine 6G
abstract	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.
publisher	FRONTIERS MEDIA SA
issn	2296-4185
year published	2021
volume	9
digital object identifier (doi)	10.3389/fbioe.2021.617328
web of science category	10
subject category	Biotechnology & Applied Microbiology; Multidisciplinary Sciences
unique article identifier	WOS:000639427200001