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Chin. Phys. B, 2010, Vol. 19(3): 037105    DOI: 10.1088/1674-1056/19/3/037105
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density

Wei Bin, Liao Ying-Jie, Liu Ji-Zhong, LuLin, Cao Jin, Wang Jun, Zhang Jian-Hua
Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China
Abstract  This paper utilizes multilayer organic light-emitting diodes with a thin layer of dye molecules to study the mechanism of charge trapping under different electric regimes. It demonstrates that the carrier trapping was independent of the current density in devices using fluorescent material as the emitting molecule while this process was exactly opposite when phosphorescent material was used. The triplet--triplet annihilation and dissociation of excitons into free charge carriers was considered to contribute to the decrease in phosphorescent emission under high electric fields. Moreover, the fluorescent dye molecule with a lower energy gap and ionized potential than the host emitter was observed to facilitate the carrier trapping mechanism, and it would produce photon emission.
Keywords:  charge trapping      current density      organic light-emitting diodes      excitation mechanism  
Received:  14 June 2009      Revised:  15 July 2009      Published:  15 March 2010
PACS:  85.60.Jb (Light-emitting devices)  
  73.50.Gr (Charge carriers: generation, recombination, lifetime, trapping, mean free paths)  
  78.60.Fi (Electroluminescence)  
  73.61.Ph (Polymers; organic compounds)  
  71.35.-y (Excitons and related phenomena)  
  71.20.Rv (Polymers and organic compounds)  
Fund: Project supported by the Key Project of Shanghai Education Committee (Grant No.~08ZZ42), and Science and Technology Commission of Shanghai Municipal (Grant Nos.~08PJ14053, 08DZ1140702 and 08520511200).

Cite this article: 

Wei Bin, Liao Ying-Jie, Liu Ji-Zhong, LuLin, Cao Jin, Wang Jun, Zhang Jian-Hua Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density 2010 Chin. Phys. B 19 037105

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