Special Section on Organic Light-Emitting Materials and Devices

Evidence for holes beyond the recombination zone and trions in the electron transport layer of organic light-emitting diodes

[+] Author Affiliations
Ying Chen, Min Cai, Emily Hellerich, Rui Liu, Zhengqing Gan, Joseph Shinar

Iowa State University, Ames Laboratory — USDOE and Department of Physics and Astronomy, Ames, Iowa 50011

Ruth Shinar

Iowa State University, Microelectronics Research Center and Department of Electrical and Computer Engineering, Ames, Iowa 50011

J. Photon. Energy. 1(1), 011017 (March 21, 2011). doi:10.1117/1.3569107
History: Received August 29, 2010; Revised February 01, 2011; Accepted March 01, 2011; Published March 21, 2011; Online March 21, 2011
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Recent electroluminescence (EL) detected magnetic resonance and transient EL studies reveal the presence and role of holes that drift beyond the recombination zone and approach the cathode in small molecular organic light-emitting diodes (OLEDs) with specific materials and structures. In particular, these studies suggest that these holes are responsible for trion (i.e., a bipolaron stabilized by a counterpolaron on an adjacent molecule) formation in the electron transport layer, and may contribute to EL spikes observed at the end of a bias pulse. The significance of these holes to overall OLED performance is discussed.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Ying Chen ; Min Cai ; Emily Hellerich ; Rui Liu ; Zhengqing Gan, et al.
"Evidence for holes beyond the recombination zone and trions in the electron transport layer of organic light-emitting diodes", J. Photon. Energy. 1(1), 011017 (March 21, 2011). ; http://dx.doi.org/10.1117/1.3569107


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