Implementing fluorescent MOFs as down-converting layers in hybrid light-emitting diodes

Angioni, Enrico and Marshall, Ross J. and Findlay, Neil J. and Bruckbauer, Jochen and Breig, Ben and Wallis, David J. and Martin, Robert W. and Forgan, Ross S. and Skabara, Peter J. (2019) Implementing fluorescent MOFs as down-converting layers in hybrid light-emitting diodes. Journal of Materials Chemistry. C, 7 (8). pp. 2394-2400. ISSN 2050-7526

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    Abstract

    One of the most important non-radiative relaxation processes that limits the quantum yield of a fluorophore is related to aggregation of the molecules in the solid-state causing excimer quenching. To limit this quenching mechanism, the fluorophore can be contained within a well-ordered 3D system that minimises aggregation through rigid bonds and spatial separation in a defined topological construct. Herein, the synthesis, characterisation and application as a down-converter of a new luminescent 3D material (MOF-BTBMBA) that incorporates a building block based on a benzothiadiazole (BT) derivative (BTBMBA) in a metal–organic framework (MOF) is presented. Notably, the photoluminescence quantum yield and hybrid LED performance are significantly improved for the MOF-based device compared to that prepared with the free ligand, highlighting the effectiveness of the rigid scaffold arrangement.