Santos Molíria V, Maturi Fernando E, Pecoraro Édison, Barud Hernane S, Lima Laís R, Ferreira Rute A S, Carlos Luís D, Ribeiro Sidney J L
Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil.
Department of Physics, CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal.
Front Bioeng Biotechnol. 2021 Mar 30;9:617328. doi: 10.3389/fbioe.2021.617328. eCollection 2021.
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.
具有同时呈现虹彩和发光特性的光子材料是设计新型光学器件的一种有吸引力的替代方案。本文介绍了一种通过纤维素纳米晶体模板二氧化硅方法的液晶自组装来整合发光和虹彩的新型光学材料的发光研究。这些含有罗丹明6G的材料是以具有手性向列组织的独立复合膜形式获得的。扫描电子显微镜证实纤维素纳米晶体膜结构包含多域布拉格反射器，并且这些膜的光学性质可以通过二氧化硅/纤维素纳米晶体相对含量的变化来调节。此外，发光化合物的加入允许对光学性质进行补充控制。总体而言，这些发现表明光子结构起到了角度依赖性内滤器的作用，导致与角度依赖性检测相关的发射光被选择性抑制。
