High efficiency polymer light-emitting diodes using ternary electron injection layers

The high efficiency of polymer light-emitting diodes (PLED) with ternary electron injection layers (EILs) including tetraoctylammonium bromide (TOAB), poly (vinylpyrrolidone) (PVP) and polyethylenimine (PEIE) to comprise PEIE-PVP-TOAB (E-P-T) EIL that has been achieved and well-studied via mixture design. In the unary system, TOAB can construct interfacial dipole via self-assembly crystallization atop various conjugated polymer surfaces to elevate the vacuum level of cathode. When employing three EILs as ternary system, the electrical property of PLED was further improved. The optimum luminescence efficiency respectively are 13.4 cd/A and 13.5 cd/A for T-P-D and E-P-T based PLED. In the ternary system (E-P-T), PEIE , PVP, and TOAB respectively provides electron injection, hole blocking, and polymer intersecting in the ternary based devices. The intersecting between PEIE and PVP by TOAB was evidenced by roughness change from AFM images.

[1]  Talha M. Khan,et al.  A Universal Method to Produce Low–Work Function Electrodes for Organic Electronics , 2012, Science.

[2]  T. Wen,et al.  Self-assembled tetraoctylammonium bromide as an electron-injection layer for cathode-independent high-efficiency polymer light-emitting diodes , 2011 .

[3]  T. Wen,et al.  Oxygen Evolution on Ir‐Ru‐Sn Ternary Oxide‐Coated Electrodes in H 2 SO 4 Solution An Approach Employing Statistical Experimental Strategy , 1993 .

[4]  T. Wen,et al.  Mixture Design Approach to PEG−PPG−PTMG Ternary Polyol-Based Waterborne Polyurethanes , 1997 .

[5]  T. Wen,et al.  A mixture design approach to the service life and the oxygen evolving catalytic activity of Ru-Sn-Ti ternary oxide coated electrodes , 1993, Journal of Applied Electrochemistry.

[6]  G. Jabbour,et al.  Ethoxylated polyethylenimine as an efficient electron injection layer for conventional and inverted polymer light emitting diodes , 2014 .

[7]  F. Huang,et al.  A Conjugated, Neutral Surfactant as Electron‐Injection Material for High‐Efficiency Polymer Light‐Emitting Diodes , 2007 .

[8]  Y. Li,et al.  A mixture design approach to thermally prepared Ir–Pt–Au ternary electrodes for oxygen reduction in alkaline solution , 2013 .

[9]  Yuguang Ma,et al.  Highly efficient, solution processed electrofluorescent small molecule white organic light-emitting diodes with a hybrid electron injection layer. , 2014, ACS applied materials & interfaces.

[10]  Lei Wang,et al.  Conjugated Zwitterionic Polyelectrolytes and Their Neutral Precursor as Electron Injection Layer for High‐Performance Polymer Light‐Emitting Diodes , 2011, Advanced materials.

[11]  Hirotake Kajii,et al.  Improved electron injection from silver electrode for all solution-processed polymer light-emitting diodes with Cs2CO3:conjugated polyelectrolyte blended interfacial layer , 2014 .

[12]  Fei Huang,et al.  Efficient Electron Injection from a Bilayer Cathode Consisting of Aluminum and Alcohol‐/Water‐Soluble Conjugated Polymers , 2004 .