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Polymers 2016, 8(2), 43; doi:10.3390/polym8020043

Light Emission Properties of a Cross-Conjugated Fluorene Polymer: Demonstration of Its Use in Electro-Luminescence and Lasing Devices

1
Centro de Investigaciones en Óptica A. P. 1-948, 37150 León Guanajuato, Mexico
2
Macromolecular Chemistry Group, Wuppertal University, Gauss-Str. 20, D-42097 Wuppertal, Germany
3
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. P. 70-360, 04510 México D. F., Mexico
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Do-Hoon Hwang
Received: 23 December 2015 / Revised: 29 January 2016 / Accepted: 1 February 2016 / Published: 5 February 2016
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Abstract

Light emission properties of a fluorene cross-conjugated polymer (PF–1) based on the monomer 4,7-bis[2-(9,9-dimethyl)fluorenyl] benzo[1,2,5]thiadiazole are reported. This polymer exhibits solubility at high concentrations, good processability into thin solid films of good quality and a broad emission band with a fluorescence quantum yield of approximately 1. Based on these features, in this paper we implemented the use of PF–1 as an active layer in polymer light-emitting diodes (PLEDs) and as a laser gain medium in solution. To get insight on the conducting properties of PF–1, two different electron injectors, poly [(9,9-bis(3′-(N,N-dimethylamino) propyl)-2,7-fluorene)-alt-2,7-(9,9–dioctylfluorene)] (PFN) and lithium fluoride (LiF), were used in a simple PLED architecture. PLEDs with the PFN film were found to exhibit better performance with a maximum luminous efficiency of 40 cd/A, a turn-on voltage (Von) of approximately 4.5 V and a luminance maximum of 878 cd/m2 at 5.5 V, with a current density of 20 A/m2. For the lasing properties of PF–1, we found a lasing threshold of around 75 μJ and a tunability of 20 nm. These values are comparable with those of rhodamine 6G, a well-known laser dye. View Full-Text
Keywords: fluorene cross-conjugated polymer; polymer light emitting diodes (PLEDs); lasing properties fluorene cross-conjugated polymer; polymer light emitting diodes (PLEDs); lasing properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Romero-Servin, S.; Lozano-Hernández, L.-A.; Maldonado, J.-L.; Carriles, R.; Ramos-Ortíz, G.; Pérez-Gutiérrez, E.; Scherf, U.; Zolotukhin, M.G. Light Emission Properties of a Cross-Conjugated Fluorene Polymer: Demonstration of Its Use in Electro-Luminescence and Lasing Devices. Polymers 2016, 8, 43.

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