Hyperbranched Polymers with High Transparency and Inherent High Refractive Index for Application in Organic Light-Emitting Diodes

Wei Q, Poetzsch R, Liu X, Komber H, Kiriy A, Voit B, Will PA, Lenk S, Reineke S (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Advanced Functional Materials Wiley-VCH Verlag

Book Volume: 26

Pages Range: 2545-2553

Journal Issue: 15

DOI: 10.1002/adfm.201504914

Abstract

Hyperbranched polyvinylsulfides have been prepared through a facile, metal-free, radical induced "A2+B3" thiol-yne polymerization of 1,3,5-tris(naphthalylethynyl) benzene and 1,4-dithiolbenzene with three different input ratios. The resulting polymers exhibit excellent optical properties like high transparency and very high refractive index (RI) of up to 1.7839, combined with high thermal stability (Td5% up to 420°C) and excellent solution processability. These properties make them ideal candidates as high RI polymeric materials (HRIP) in connection with light out-coupling schemes for organic light-emitting diodes (OLEDs). A series of hyperbranched HRIPs with varying monomer compositions have been compared in their optical properties. Finally, phosphorescent monochrome OLEDs are fabricated on top of HRIP layers to test the compatibility of HRIPs with state-of-the-art OLEDs. The results show that the HRIPs do not deteriorate the performance of the OLEDs while maintaining external quantum efficiencies of over 20% for phosphorescent red OLEDs. These results open a pathway toward alternative, low-cost, and scalable out-coupling concepts through refractive index matching of the OLED materials and the HRIPs presented.

Involved external institutions

Leibniz-Institut für Polymerforschung Dresden e. V. DE Germany (DE) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Wei, Q., Poetzsch, R., Liu, X., Komber, H., Kiriy, A., Voit, B.,... Reineke, S. (2016). Hyperbranched Polymers with High Transparency and Inherent High Refractive Index for Application in Organic Light-Emitting Diodes. Advanced Functional Materials, 26(15), 2545-2553. https://doi.org/10.1002/adfm.201504914

MLA:

Wei, Qiang, et al. "Hyperbranched Polymers with High Transparency and Inherent High Refractive Index for Application in Organic Light-Emitting Diodes." Advanced Functional Materials 26.15 (2016): 2545-2553.

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