Lova Paola, Congiu Simone, Sparnacci Katia, Angelini Angelo, Boarino Luca, Laus Michele, Di Stasio Francesco, Comoretto Davide
Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova Via Dodecaneso 31 16132 Genova Italy
Dipartimento di Scienze e Innovazione Tecnologica (DISIT), Università del Piemonte Orientale "A. Avogadro", INSTM, UdR Alessandria Viale T. Michel 11 15121 Alessandria Italy
RSC Adv. 2020 Apr 16;10(25):14958-14964. doi: 10.1039/d0ra02245d. eCollection 2020 Apr 8.
Photonic crystals are a unique tool to modify the photoluminescence of light-emitting materials. A variety of optical effects have been demonstrated by infiltrating opaline structures with photoactive media. On the other hand, the fabrication of such structures includes complex infiltration steps, that often affect the opal lattice and decrease the efficiency of light emission control. In this work, silica nanospheres were directly functionalized with rhodamine B to create an emitting shell around the dielectric core. Simple tuning of the microsphere preparation conditions allows selecting the appropriate sphere diameter and polydispersity index approaching 5%. These characteristics allow facile self-assembling of the nanospheres into three-dimensional photonic crystals whose peculiar density of photonic states at the band-gap edges induces spectral redistribution of the rhodamine B photoluminescence. The possibility to employ the new stable structure as sensor is also investigated. As a proof of principle, we report the variation of light emission obtained by exposure of the opal to vapor of chlorobenzene.
光子晶体是一种用于修饰发光材料光致发光的独特工具。通过用光敏介质渗透蛋白石结构已证明了多种光学效应。另一方面，此类结构的制造包括复杂的渗透步骤，这常常会影响蛋白石晶格并降低发光控制效率。在这项工作中，二氧化硅纳米球直接用罗丹明B进行功能化，以在介电核周围形成发射壳。简单调整微球制备条件可选择合适的球直径和接近5%的多分散指数。这些特性使得纳米球能够轻松自组装成三维光子晶体，其在带隙边缘处特殊的光子态密度会引起罗丹明B光致发光的光谱重新分布。还研究了将这种新的稳定结构用作传感器的可能性。作为原理证明，我们报告了通过将蛋白石暴露于氯苯蒸气而获得的发光变化。
