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O: Fachverband Oberflächenphysik
O 46: Poster Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties
O 46.12: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
The Luminescence of Rylene Derivatives — •Petr Kahan1, Rodrigo Ferreira1,2, Amandeep Sagwal1, Jiří Doležal2, and Martin Švec1,2 — 1Institute of Physics, Czech Academy of Sciences — 2Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences
The exploration of single-molecule luminescence using scanning tunneling microscopy (STM) is a vividly developing area of research. A number of works using STM-PL/EL and TERS techniques addressing the photophysics at the true single-molecule limit have employed rylene dyes for their known luminescent properties [1,2]. However, up to this point, a thorough comparison investigating the absorption and luminescent characteristics of molecules that share similar rylene-based configurations has not been carried out. This study presents a comparative analysis with the tip-enhanced spectromicroscopy in STM nanocavity on isolated molecules such as NTCDA, PTCDA, and DBP [3]. The findings reveal surprisingly distinct characteristics of each species; notably of their photoluminescence (PL) fingerprints and photocurrent maps. This shows the versatility of chemically related species, which holds promise for tailoring custom optoelectronic functionality in molecular aggregates.
[1] Doležal, J. et al. ACS Nano 16, 1082*1088 (2022). [2] Kimura, K. et al. Nature 570, 210*213 (2019). [3] Kröger, J. et al. Nano Lett. 18, 3407*3413 (2018).
Keywords: STM; photoluminescence; tip-enhanced; chromophore; nanocavity