Title Effect of substituents at imide positions on the laser performance of 1,7-bay-substituted perylenediimide dyes
Authors Muñoz-Mármol, Rafael ; Boj, Pedro G ; Villalvilla, José M ; Quintana, José A ; Zink-Lorre, Nathalie ; Sastre-Santos, Ángela ; Aragó, Juan ; Ortí, Enrique ; Baronas, Paulius ; Litvinas, Džiugas ; Juršėnas, Saulius Antanas ; Fenández-Lázaro, Fernando ; Díaz-García, María A
DOI 10.1021/acs.jpcc.1c00833
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Is Part of The journal of physical chemistry C.. Washington : American Chemical Society. 2021, vol. 125, p. 12277-12288.. ISSN 1932-7447. eISSN 1932-7455
Keywords [eng] perylenediimide (PDI) compounds ; organic lasers ; optical properties
Abstract [eng] Perylenediimide (PDI) compounds with no substituents in their core are widely used as the active units of thin-film organic lasers. Recently, bay-substituted PDIs (b-PDIs) bearing two sterically hindering diphenylphenoxy groups at the 1,7-bay positions have received great attention because they show red-shifted emission with respect to bay-unsubstituted PDIs, while maintaining high photoluminescence (PL) quantum yields and low amplified spontaneous emission (ASE) thresholds even at high doping rates. However, their ASE photostability is relatively low compared to that of state-of-the-art PDIs. Thus, the design of b-PDIs with improved ASE photostability remains a challenge. Here, the synthesis of two b-PDIs with phenyl-type substituents at the imide positions is reported. Complete characterization of their optical properties, including absorption, PL, ASE, and transient spectroscopy, supported also by quantum chemical calculations, is performed with the dyes diluted in either a liquid solvent or a polystyrene film. Film experiments were accomplished at very low doping rates, to resemble the isolated molecule behavior, and also in a range of increasing doping rates, to investigate concentration quenching effects. The reported b-PDIs show improved ASE photostability (3-fold) with respect to b-PDIs with aliphatic-type substituents at the imide positions, whilst they show more propensity toward aggregation.
Published Washington : American Chemical Society
Type Journal article
Language English
Publication date 2021
CC license CC license description