2018
DOI: 10.1063/1.5041418
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Substrate-induced shifts and screening in the fluorescence spectra of supramolecular adsorbed organic monolayers

Abstract: We have investigated the influence of the substrate on the fluorescence of adsorbed organic molecules. Monolayer films of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI), a supramolecular network formed from PTCDI and melamine, and perylene-3,4,9,10-tetracarboxylic-3,4,9,10-dianhydride have been deposited on hexagonal boron nitride (hBN). The principal peaks in the fluorescence spectra of these films were red-shifted by up to 0.37 eV relative to published measurements for molecules in helium droplet… Show more

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Cited by 25 publications
(44 citation statements)
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“…Indeed, DFT calculations have predicted the adsorption of the pyrene with the aromatic rings centered above the N-positions of a free-standing hBN sheet [81]. Preferred alignments have also been reported for low coverages of PTCDA and MnPc on the strongly corrugated hBN/Rh(111) support [21,22,80], with computational modeling showing PTCDA rings positioned above the N sites of a hBN flake [14]. In contrast, no preferred orientations have been identified for a hydrocarbon lander molecule (i.e., DBP) on hBN/Pt(111) [19].…”
Section: Self-assemblymentioning
confidence: 90%
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“…Indeed, DFT calculations have predicted the adsorption of the pyrene with the aromatic rings centered above the N-positions of a free-standing hBN sheet [81]. Preferred alignments have also been reported for low coverages of PTCDA and MnPc on the strongly corrugated hBN/Rh(111) support [21,22,80], with computational modeling showing PTCDA rings positioned above the N sites of a hBN flake [14]. In contrast, no preferred orientations have been identified for a hydrocarbon lander molecule (i.e., DBP) on hBN/Pt(111) [19].…”
Section: Self-assemblymentioning
confidence: 90%
“…In addition to this effect, the adsorption and supramolecular organization on hBN could sensitively affect the optical transitions [14,16,21]. For example, the fluorescence peak energy of perylene derivatives was reduced considerably (0.3-0.4 eV) upon the adsorption on bulklike hBN [14]. Accordingly, the gaps and excitation energy compiled in Figure 6 did not allow for a direct comparative assessment of the interaction of the pyrene derivatives with the environment on hBN or in solution.…”
Section: Spectroscopic Investigations and Determination Of The Molecumentioning
confidence: 99%
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“…To investigate the decoupling of an organic molecule from a metal substrate by a monolayer of hBN we chose PTCDA and the Cu(111) surface. PTCDA serves as a planar model molecule for investigations of organic layers on surfaces [20][21][22][23]. Monolayers of hBN on Cu(111) have been investigated by several groups and are, hence, rather well understood [24][25][26][27][28][29].…”
Section: Introductionmentioning
confidence: 99%
“…However, to the best of our knowledge, there have been no studies on the FL of monolayers of molecules on metal-supported hBN layers, yet. Kerfoot et al [22] studied the FL of PTCDA and perylene-3,4,9,10-tetracarboxylic-3,4,9,10diimide (PTCDI) on an exfoliated hBN monolayer that was transferred onto SiO 2 . Forker et al [23] investigated the optical absorption properties of PTCDA on hBN/Rh(111) and hBN/ Pt(111).…”
Section: Introductionmentioning
confidence: 99%