One-Directional Antenna Systems: Energy Transfer from Monomers to JAggregates within 1D Nanoporous Aluminophosphates
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Date
2017-10-01Author
Sola Llano, Rebeca
Fujita, Yasuhiko
Gómez Hortigüela, Luis
Alfayate, Almudena
Uji-i, Hiroshi
Fron, Eduard
Toyouchi, Shuichi
Pérez Pariente, Joaquín
López Arbeloa, Iñigo María
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ACS Photonics 5(1) ; 151–157(2018)
Abstract
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.