Improved Electro-optical Performance of OLEDs Using PdCo Alloy Nanoparticles Supported on Polypropylenimine Dendrimer–Grafted Graphene

• Published in: Journal of inorganic and organometallic polymers and materials Vol. 28; no. 3; pp. 783 - 789
• Main Authors: Janghouri, Mohammad, Mohajerani, Ezeddin, Hosseni, Hadi
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2018; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Efficiency; Electric potential; Graphene; Inorganic Chemistry; Nanoparticles; Organic Chemistry; Organic light emitting diodes; Palladium base alloys; Polymer Sciences; Polystyrene resins; Sulfonic acid; Hole injection; Graphene oxide; OLEDs; PdCo/PPI–g-G; Luminescence efficiency
• ISSN: 1574-1443; 1574-1451
• DOI: 10.1007/s10904-017-0759-6

We fabricated organic light emitting diodes (OLEDs) with PdCo alloy nanoparticles supported on polypropylenimine dendrimer–grafted graphene (PdCo/PPI–g-G) that was doped at different concentrations (0, 0.02, 0.03, 0.06 and 2 wt%) in a poly(3,4-ethylene dioxythiophene): polystyrene sulfonic acid (PEDOT:PSS) as a host layer. PdCo PPI–g-G and PEDOT:PSS were studied as hole injection layers in OLEDs. The efficiency of hole injection from the anode is strongly dependent on the concentration of the PdCo/PPI–g-G. While a graphene oxide and pure PEDOT:PSS layer leads to higher driving voltage and decreased luminescence efficiency. PdCo/PPI–g-G of 0.02 wt% noticeably enhanced the hole injection and resulted in lower turn-on voltage, increased luminance, and current efficiencies. The 0.02 wt% PdCo/PPI–g-G based device has also a luminance of 3705 cd/m 2 and maximum efficiency of 1.9 cd/A at 13 V which are the highest values among other PdCo/ PPI–g-G based devices.