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Nanomaterials
Volume 12
Issue 22
10.3390/nano12224099
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Article

Influence of Dopant Concentration and Annealing on Binary and Ternary Polymer Blends for Active Materials in OLEDs

by
Maria Gioti
1,*,
Despoina Tselekidou
1,
Vasileios Foris
1,
Vasileios Kyriazopoulos
2,
Kyparisis Papadopoulos
1,
Spyros Kassavetis
1 and
Stergios Logothetidis
1,2
1
Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
2
Organic Electronic Technologies P.C. (OET), 20th KM Thessaloniki—Tagarades, GR-57001 Thermi, Greece
*
Author to whom correspondence should be addressed.
Nanomaterials 2022, 12(22), 4099; https://doi.org/10.3390/nano12224099
Submission received: 28 October 2022 / Revised: 10 November 2022 / Accepted: 17 November 2022 / Published: 21 November 2022
(This article belongs to the Section Nanophotonics Materials and Devices)
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Abstract

Obtaining white light from organic LEDs is a considerable challenge and, to realize white light emission, many studies have been conducted, primarily addressing two- or three-color blend systems as a promising strategy. In this work, pristine films, grown by spin coating, consisting of commercial blue Poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO), green Poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), and red spiro-copolymer (SPR) light-emitting materials, were studied as reference materials. Afterward, binary (SPR doped in host PFO) and ternary (SPR and F8BT doped in host PFO) thin films were successfully prepared with various ratios. The characterization of the as-grown and thermally-treated blend films was focused on their optical and photophysical properties. After, the fabrication of OLED devices on glass substrates was carried out for the evaluation of a blend’s composition and annealing in terms of the devices’ electrical characteristics and electro-emission properties in order to achieve white light emission. Their analysis provided insights into the energy transfer mechanisms between the constituent materials, which were correlated to host–guest interactions as well as to the structural changes originated by thermal treatment, leading to the crystallization of PFO. Finally, the OLEDs based on ternary blends approach the white light emission with (x, y) of (0.272, 0.346). These fabricated devices also exhibit turn-on voltages as low as 3 V, accompanied by remarkable luminance values above 3000 cd/m2.
Keywords: white OLED; blend; binary; ternary; Förster white OLED; blend; binary; ternary; Förster
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MDPI and ACS Style

Gioti, M.; Tselekidou, D.; Foris, V.; Kyriazopoulos, V.; Papadopoulos, K.; Kassavetis, S.; Logothetidis, S. Influence of Dopant Concentration and Annealing on Binary and Ternary Polymer Blends for Active Materials in OLEDs. Nanomaterials 2022, 12, 4099. https://doi.org/10.3390/nano12224099

AMA Style

Gioti M, Tselekidou D, Foris V, Kyriazopoulos V, Papadopoulos K, Kassavetis S, Logothetidis S. Influence of Dopant Concentration and Annealing on Binary and Ternary Polymer Blends for Active Materials in OLEDs. Nanomaterials. 2022; 12(22):4099. https://doi.org/10.3390/nano12224099

Chicago/Turabian Style

Gioti, Maria, Despoina Tselekidou, Vasileios Foris, Vasileios Kyriazopoulos, Kyparisis Papadopoulos, Spyros Kassavetis, and Stergios Logothetidis. 2022. "Influence of Dopant Concentration and Annealing on Binary and Ternary Polymer Blends for Active Materials in OLEDs" Nanomaterials 12, no. 22: 4099. https://doi.org/10.3390/nano12224099

APA Style

Gioti, M., Tselekidou, D., Foris, V., Kyriazopoulos, V., Papadopoulos, K., Kassavetis, S., & Logothetidis, S. (2022). Influence of Dopant Concentration and Annealing on Binary and Ternary Polymer Blends for Active Materials in OLEDs. Nanomaterials, 12(22), 4099. https://doi.org/10.3390/nano12224099

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