Enhanced color purity of blue OLEDs based on well-design structure

We have fabricated blue organic light-emitting devices (OLEDs) with higher color purity and stability by optimizing the structure of the Glass/ITO/NPB(50 nm)/ BCzVBi (30 nm)/ TPBi (x nm)/Alq3(20 nm)/LiF/Al. The results show that the introducing of hole blocking layer(HBL) TPBi greatly can improve not only the color purity but the color stability, which owe to its higher the Highest Occupied Molecular Orbital (HOMO) energy levels of 6.2 eV. We expect our work will be useful to optimizing the blue OLEDs structure to enhancing the color property.

[1]  Chih-Hung Tsai,et al.  Highly Efficient, Deep‐Blue Doped Organic Light‐Emitting Devices , 2005 .

[2]  K. Leo,et al.  Organic light-emitting diodes for lighting: High color quality by controlling energy transfer processes in host-guest-systems , 2012 .

[3]  J. Kieffer,et al.  Achieving Highly Efficient Fluorescent Blue Organic Light‐Emitting Diodes Through Optimizing Molecular Structures and Device Configuration , 2011 .

[4]  B. Gautam,et al.  Observation of the energy transfer sequence in an organic host–guest system of a luminescent polymer and a phosphorescent molecule , 2014 .

[5]  H. Kwok,et al.  Full color organic electroluminescent display with shared blue light-emitting layer for reducing one fine metal shadow mask , 2012 .

[6]  G. He,et al.  Study of energy transfer in single and multi-emissive layer using Gaussian peak fitting , 2014 .

[7]  Lei Wang,et al.  Highly efficient and stable sky blue organic light-emitting devices , 2006 .

[8]  C. Adachi,et al.  Design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes. , 2012, Journal of the American Chemical Society.

[9]  H. Tam,et al.  Highly efficient and stable white light organic light-emitting devices , 2007 .

[10]  Gregor Schwartz,et al.  White organic light-emitting diodes with fluorescent tube efficiency , 2009, Nature.

[11]  Zhenghong Lu,et al.  Band Alignment at Anode/Organic Interfaces for Highly Efficient Simplified Blue-Emitting Organic Light-Emitting Diodes , 2010 .

[12]  Young Kwan Kim,et al.  Luminescence characteristics of hybrid dual emitting layers in blue organic light-emitting diodes by controlling the fluorescent doping concentration , 2014 .

[13]  Zhenghong Lu,et al.  Highly efficient blue fluorescent organic light-emitting diodes with a high emitter/host ratio , 2013 .

[14]  M. N. Kamalasanan,et al.  Efficiency enhancement of organic light emitting diode via surface energy transfer between exciton and surface plasmon , 2012 .

[15]  Changhee Lee,et al.  Efficient Blue Organic Light-Emitting Diodes using Newly Developed Pyrene-Based Electron Transport Materials , 2009 .

[16]  Joseph Shinar,et al.  Förster energy transfer in combinatorial arrays of selective doped organic light-emitting devices , 2004 .

[17]  Stephen R. Forrest,et al.  Blue organic electrophosphorescence using exothermic host–guest energy transfer , 2003 .

[18]  M. N. Kamalasanan,et al.  Surface plasmon enhanced blue organic light emitting diode with nearly 100% fluorescence efficiency , 2012 .