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

doi:10.1088/1674-1056/19/3/037105

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: organic light-emitting diodes excitation mechanism charge trapping current density

Received: 14 June 2009
Revised: 15 July 2009
Accepted manuscript online:

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).

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Wei Bin(魏斌), Liao Ying-Jie (廖英杰), Liu Ji-Zhong (刘纪忠), Lu Lin(路林), Cao Jin(曹进), Wang Jun (王军), and Zhang Jian-Hua (张建华) 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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Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density

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