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One-Directional Antenna Systems: Energy Transfer from Monomers to J-Aggregates within 1D Nanoporous Aluminophosphates
ACS Photonics ( IF 7 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1021/acsphotonics.7b00553
Rebeca Sola-Llano 1 , Yasuhiko Fujita 2, 3 , Luis Gómez-Hortigüela 4 , Almudena Alfayate 4 , Hiroshi Uji-i 2, 5 , Eduard Fron 2 , Shuichi Toyouchi 2 , Joaquín Pérez-Pariente 4 , Iñigo López-Arbeloa 1 , Virginia Martínez-Martínez 1
Affiliation  

A cyanine dye (PIC) was occluded into two 1D-nanopoporus Mg-containing aluminophosphates with different pore size (MgAPO-5 and MgAPO-36 with AFI and ATS zeolitic structure types, with cylindrical channels of 7.3 Å diameter and elliptical channels of 6.7 Å × 7.5 Å, respectively) by crystallization inclusion method. Different J-aggregates are photophysically characterized as a consequence of the different pore size of the MgAPO frameworks, with emission bands at 565 nm and at 610 nm in MgAPO-5 and MgAPO-36, respectively. Computational results indicate a more linear geometry of the J-aggregates inside the nanochannels of the MgAPO-36 sample than those in MgAPO-5, which is as a consequence of the more constrained environment in the former. For the same reason, the fluorescence of the PIC monomers at 550 nm is also activated within the MgAPO-36 channels. Owing to the strategic distribution of the fluorescent PIC species in MgAPO-36 crystals (monomers at one edge and J-aggregates with intriguing emission properties at the other edge) an efficient and one-directional antenna system is obtained. The unidirectional energy transfer process from monomers to J-aggregates is demonstrated by remote excitation experiments along tens of microns of distance.

中文翻译:

一向天线系统:在一维纳米多孔铝磷酸盐中从单体到J-聚集体的能量转移

将花青染料(PIC)吸附到两种具有不同孔径的一维含纳米磷酸镁的铝磷酸盐中(具有AFI和ATS沸石结构类型的MgAPO-5和MgAPO-36,具有7.3Å直径的圆柱形通道和6.7Å的椭圆形通道×分别为7.5Å)。由于MgAPO骨架的孔径不同,对不同的J聚集体进行了光物理表征,MgAPO-5和MgAPO-36中的发射带分别在565 nm和610 nm处发射。计算结果表明,MgAPO-36样品的纳米通道内部的J聚集体比MgAPO-5的纳米通道具有更线性的几何结构,这是由于前者环境更受限制的结果。为了同样的原因,MgAPO-36通道内的PIC单体在550 nm处的荧光也被激活。由于MgAPO-36晶体中荧光PIC物质的战略性分布(一个边缘处为单体,另一边缘处具有令人着迷的发射特性的J聚集体),可以得到一种高效的单向天线系统。从单体到J聚集体的单向能量转移过程通过沿数十微米距离的远程激发实验得到了证明。
更新日期:2017-11-01
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