Vacuum spray method: A novel method for fabricate bilayer and graded structures in polymer thin films

Fabrication in-depth structures include multi-layer and graded structures can improve the efficiencies of opto-electric devices such as solar cell and light-emitting diode (LED). Dr. Mo at Fudan University and Dr. T. Hiraga’s group at National Institute of Advanced Industrial Science and Technology (AIST) have developed a novel method to fabricate in-depth structures of small organic material dispersed in semiconductor polymer films.  

 The electron transfer material Alq3 was dispersed into hole transfer polymer P3HT(regiorandom) with in-depth profiles. The in-depth profiles were easily achieved just by adjusting the ratio of  Alq3/P3HT in solution during the spray process. Compared with the uniformly dispersed structure, the LEDs with bilayer and graded structures can emit much brighter light. Due to the dissolution by the solvents, other polymer thin film preparation methods using solvent are very difficult to fabricate multi-layer and graded structures. Vacuum spray method should be a very promising method for the polymer opto-electric devices fabrication.

The authors of this work are from:

  1. Material Science Department, Fudan University, Shanghai, China
  2. Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka, Japan

 

Original article citation
Xiaoliang Mo, Toshiko Mizokuro, Claire Heck, Nobutaka Tanigaki and Takashi Hiraga,”Graded doped structure fabricated by vacuum spray method to improve the luminance of polymer light-emitting diodes”,Nano-Micro Lett.1, 092401 (2009).
http://nmletters.org

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