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Red organic light emitting device based on TPP and a new host material

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Abstract

A novel coating method for fabrication of red OLEDs by using a new host material has been developed with the aid of a single furnace. The host material, zinc complex, was prepared from the reaction of zinc acetate and 2-methyl-8-hydroxyquinoline and after characterization by UV-vis, FT-IR, and 1H NMR spectroscopes was used as an emitting material in the fabrication of OLEDs. Since meso-tetraphenylporphyrin (TPP) and zinc complex have a close molecular weight, both materials were evaporated from a single furnace. Devices with TPP and structures of ITO/PEDOT:PSS (55 nm)/PVK (90 nm)/zinc complex:TPP (65 nm)/Al (180 nm) were fabricated; Without TPP green and with TPP red emission was achieved. The device with 2 % TPP that doped into the zinc complex showed the purest red emission among all devices. The device showed the CIE coordinates of 0.70 and 0.28 at 14 V and a maximum luminance of about 94.2 cd/m2. This new method is a promising candidate for fabrication of low cost red OLEDs with a more homogeneous layer.

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Acknowledgements

The authors would like to thank the Vice-President’s Office for Research Affairs of Shahid Beheshti University and the Iran National Science Foundation: INSF for supporting this work.

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Authors and Affiliations

  1. Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran, 1983963113, Iran

    Mohammad Janghouri & Ezeddin Mohajerani

  2. Department of Chemistry, Shahid Beheshti University, G.C., Tehran, 1983963113, Iran

    Mostafa M. Amini & Ezzatollah Najafi

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  1. Mohammad Janghouri
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  2. Ezeddin Mohajerani
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  3. Mostafa M. Amini
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  4. Ezzatollah Najafi
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Correspondence to Ezeddin Mohajerani.

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Janghouri, M., Mohajerani, E., Amini, M.M. et al. Red organic light emitting device based on TPP and a new host material. Appl. Phys. A 114, 445–451 (2014). https://doi.org/10.1007/s00339-013-7627-1

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  • DOI: https://doi.org/10.1007/s00339-013-7627-1

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