Spin-cast thin semiconducting polymer interlayer for improving device efficiency of polymer light-emitting diodes

Ji-Seon Kim; Friend, Richard H.; Grizzi, Ilaria; Burroughes, Jeremy H.
July 2005
Applied Physics Letters;7/11/2005, Vol. 87 Issue 2, p023506
Academic Journal
We report that adding a thin (∼10 nm) semiconducting polymer interlayer between apoly(styrenesulphonate)-doped poly(3,4-ethylenedioxythiophene) (PEDT:PSS) hole transporter and an emissive semiconductor significantly improves the device efficiency of polymer light-emitting diodes (LEDs). With the interlayer, the external quantum efficiency (EQE) increases from 0.7%(0.4 cd/A at 3.7 V) to 1.9% (1.0 cd/A at 3.3 V) at 100 cd/m2 for red LEDs and from 1.9%(6.2 cd/A at 3.4 V) to 3.0% (10.1 cd/A at 3.0 V) at 1000 cd/m2 for green LEDs. An EQE of 4.0% is also observed in blue LEDs (35% increase). The interlayer is spin-coated directly on top of the PEDT:PSS layer from a poly(2,7-(9,9-di-n-octylfluorene)-alt-(1,4-phenylene-((4-sec-butylphenyl)imino)-1,4-phenylene)) (TFB) solution. This interlayer prevents significant quenching of radiative excitons at the PEDT:PSS interface by acting as an efficient exciton blocking layer.


Related Articles

  • Efficient deep-blue phosphorescent organic light-emitting device with improved electron and exciton confinement. Ying Zheng; Sang-Hyun Eom; Neetu Chopra; Jaewon Lee; Franky So; Jiangeng Xue // Applied Physics Letters;6/2/2008, Vol. 92 Issue 22, p223301 

    We report a significant improvement in the efficiency of deep-blue phosphorescent organic light-emitting devices based on the electrophosphorescent dye bis(4′,6′-difluorophenylpyridinato)tetrakis (1-pyrazolyl) borate (FIr6). Using 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) as...

  • Spectral conversion of InGaN ultraviolet microarray light-emitting diodes using fluorene-based red-, green-, blue-, and white-light-emitting polymer overlayer films. Heliotis, G.; Stavrinou, P. N.; Bradley, D. D. C.; Gu, E.; Griffin, C.; Jeon, C. W.; Dawson, M. D. // Applied Physics Letters;9/5/2005, Vol. 87 Issue 10, p103505 

    We report the fabrication of hybrid organic/inorganic semiconductor light-emitting devices that operate across the entire visible spectrum. The devices are based on a series of blue-, green-, and red-light-emitting polyfluorene materials that convert the emission from an array of micron-sized...

  • Enhancement of organic magnetoresistance by electrical conditioning. Niedermeier, U.; Vieth, M.; Pätzold, R.; Sarfert, W.; von Seggern, H. // Applied Physics Letters;5/12/2008, Vol. 92 Issue 19, p192902 

    We demonstrate that electrical conditioning can be used as an efficient method to enhance the organic magnetoresistance effect in organic light emitting diodes. Depending on duration and intensity of the conditioning process the absolute value of the magnetoresistance effect can be increased...

  • Electrophosphorescence from triplet excimers in poly-(N-vinylcarbazole). Qian, Lei; Bera, Debasis; Holloway, Paul H. // Applied Physics Letters;3/5/2007, Vol. 90 Issue 10, p103511 

    The authors have observed electrophosphorescence from triplet excimer in poly-(N-vinylcarbazole) (PVK) polymer at room temperature. The triplet excimer appears to be influenced by the PVK molecular conformation. This observation is very important to the understanding of the mechanism of triplet...

  • Synthesis and light-emitting properties of poly[9-(4′-tert-butyl-phenylenemethene)-fluoroene-co-9,9-dioctylfluorene]. Yu, Zongqiang; Tan, Songting; Yuan, Zhuling; Zou, Yingping; Fan, Benhu; Li, Yongfang // Journal of Materials Science;Feb2007, Vol. 42 Issue 4, p1325 

    A novel copolymer, poly[9-(4′-tert-butyl-phenylenemethene)-fluoroene-co-9,9-dioctylfluorene], has been synthesized through the Yamamoto coupling method. The copolymer has good solubility and thermal stability with a glass transition temperature at 85 °C. The PL spectrum of the copolymer...

  • Controlling bulk aggregation state in semiconducting conjugated polymer solution. Chi-Chung Hua; Chih-Yuan Kuo; Show-An Chen // Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123303 

    Dynamic light scattering measurements disclosed the ubiquity of large aggregate species (i.e., generally above 100 nm in hydrodynamic radius) in the precursor solutions customarily used to fabricate polymer-based light-emitting diodes (PLEDs). Transformation of these species into nanoscale thin...

  • Organic Electronics. Gharpure, Y. H. // Chemical Business;Jan2014, Vol. 28 Issue 1, p29 

    The article offers information on organic (polymer) electronics. Organic electronics is said to be a branch of material science dealing with electrically conductive polymers and conductive small molecules. Polyacetylene, polyaniline and polythiophene are also included in the group. Organic...

  • Organic electronics.  // Chemical Business;Jan2014, Vol. 28 Issue 1, p33 

    The article offers information on organic (polymer) electronics. Organic electronics is said to be a branch of material science dealing with electrically conductive polymers and conductive small molecules. Polyacetylene, polyaniline and polythiophene are also included in the group. Organic...

  • Coupling between the exciton and cavity modes in a GaAs/GaAlAs asymmetric microcavity structure. Lin, D. Y.; Chou, Y. H.; Huang, Y. S.; Tiong, K. K. // Journal of Applied Physics;5/1/2005, Vol. 97 Issue 9, p093511 

    The coupling effect between the cavity mode and excitonic states in a GaAs/GaAlAs asymmetric microcavity structure was studied via angle and temperature dependent reflectance and piezoreflectance (PzR) measurements in the angular range 10°<θinc<60° and temperature range 20 K


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics