Abstract
We have enhanced hole injection and lifetime in organic light-emitting diodes (OLEDs) by incorporating the isomeric metal phthalocyanine, CuMePc, as a hole injection enhancer. The OLED devices containing CuMePc as a hole injection layer (HIL) exhibited higher luminous efficiency and operational lifetime than those using a CuPc layer and without a HIL. The effect of CuMePc thickness on device performance was investigated. Atomic force microscope (AFM) studies revealed that the thin films were smooth and uniform because the mixture of CuMePc isomers depressed crystallization within the layer. This may have caused the observed enhanced hole injection, indicating that CuMePc is a promising HIL material for highly efficient OLEDs.
Highlights
We have enhanced hole injection and lifetime in organic light-emitting diodes (OLEDs) by incorporating the isomeric metal phthalocyanine, CuMePc, as a hole injection enhancer
We have reported the use of tetra-methyl substituted copper (II) phthalocyanine (CuMePc) in solar cells to promote charge mobility and photon harvesting (Fig. 1(a)).[19]
As the highest occupied molecular orbital (HOMO) level of CuMePc (5.1 eV) is comparable to that of CuPc (5.2 eV), the energy barrier of hole injection could be lowered by inserting a CuMePc buffer layer between the indium tin oxide (ITO) anode and the HTL
Summary
We have enhanced hole injection and lifetime in organic light-emitting diodes (OLEDs) by incorporating the isomeric metal phthalocyanine, CuMePc, as a hole injection enhancer. The OLED devices containing CuMePc as a hole injection layer (HIL) exhibited higher luminous efficiency and operational lifetime than those using a CuPc layer and without a HIL.
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