Current-induced fluorescence quenching in organic light-emitting diodes

Young, Ralph H.; Tang, Ching W.; Marchetti, Alfred P.
February 2002
Applied Physics Letters;2/4/2002, Vol. 80 Issue 5, p874
Academic Journal
The electroluminescence quantum efficiency of organic light-emitting diodes with a doped Alq [tris(8-quinolinolato)aluminum] emitting layer is found to decrease markedly with increasing current density. This phenomenon was investigated using multilayer device structures permitting bipolar or unipolar carrier transport, and luminescence measurements with simultaneous optical and electrical excitation. The loss of electroluminescence quantum efficiency is attributed to the quenching of the singlet-excited state of the dopant by a cationic species. © 2002 American Institute of Physics.


Related Articles

  • Fluorescence dynamics of phenyl-substituted polyphenylenevinylene–trinitrofluorenone blend systems. Im, C.; Lupton, J. M.; Schouwink, P.; Heun, S.; Becker, H.; Ba¨ssler, H. // Journal of Chemical Physics;7/15/2002, Vol. 117 Issue 3, p1395 

    Steady state as well as time-resolved fluorescence of phenyl-substituted polyphenylenevinylene (PhPPV), both in solution and in form of spin-coated films has been measured. In solution the fluorescence decays exponentially with a 1/e decay time of ∼700 ps, whereas the 1/e decay in the film...

  • Dipyrazolopyridine derivatives as bright blue electroluminescent materials. Tao, Y. T.; Tao, Y.T.; Balasubramaniam, E.; Danel, A.; Tomasik, P. // Applied Physics Letters;8/14/2000, Vol. 77 Issue 7 

    Very bright blue organic light emitting diodes were fabricated using highly fluorescent dipyrazolopyridine derivatives, 4-(4-substituted phenyl)-1,7-diphenyl-3,5-dimethyl-1,7dihydrodipyrazolo[3,4-b,4′,3′-e]pyridine (PAP-X, X==CN, Ph, and OMe), as emitter by doping the dye in an...

  • Bright ideas for big savings. MURRAH, JULIANNE // Graham Leader;10/30/2013, Vol. 138 Issue 22, p1A 

    The article focuses on the facility lighting in Graham, Texas, which aims to work with Philips Lighting Capital for the installation of light emitting diodes (LED) or T5 fluorescent lighting for energy cost-saving purposes.

  • CORRIGENDUM: Promising operational stability of high-efficiency organic lightemitting diodes based on thermally activated delayed fluorescence.  // Scientific Reports;1/17/2014, p1 

    A correction to the article "Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence" by Hajime Nakanotani, Kensuke Masui, Junichi Nishide, Takumi Shibata and Chihaya Adachi published in the previous issue is presented.

  • Fluorescent molecules offer another route to efficient organic LEDs. Miller, Johanna // Physics Today;Feb2013, Vol. 66 Issue 2, p10 

    The article focuses on the study by Chihaya Adachi and his Kyushu University in Japan colleagues on forcing orbitals in fluorescent molecules to reside on a different part of the molecule instead of spreading. Adachi and his team embedded each carbazolyl dicyanobenzenes (CDCB) in an organic host...

  • High-efficiency yellow double-doped organic light-emitting devices based on phosphor-sensitized fluorescence. D’Andrade, Brian W.; Baldo, Marc A.; Adachi, Chihaya; Brooks, Jason; Thompson, Mark E.; Forrest, Stephen R. // Applied Physics Letters;8/13/2001, Vol. 79 Issue 7 

    We demonstrate high-efficiency yellow organic light-emitting devices (OLEDs) employing [2-methyl-6-[2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene] propane-dinitrile (DCM2) as a fluorescent lumophore, with a green electrophospho- rescent sensitizer, fac...

  • LED light bulbs: ready for takeoff.  // Corridor Business Journal;8/13/2012 Threshold Supplement, p8 

    The article focuses on the light emitting diode (LED) light bulbs that are inexpensive, durable, versatile and long lasting than both incandescent and fluorescent lighting.

  • An LED-based fluorometer for chlorophyll quantification in the laboratory and in the field. Lamb, Jacob; Eaton-Rye, Julian; Hohmann-Marriott, Martin // Photosynthesis Research;Oct2012, Vol. 114 Issue 1, p59 

    The chlorophyll content is an important experimental parameter in agronomy and plant biology research. In this report, we explore the feasibility of determining total concentration of extracts containing chlorophyll a and chlorophyll b by chlorophyll fluorescence. We found that an excitation at...

  • Energy saving exit signs.  // Fire Safety Engineering;Jul2002, Vol. 9 Issue 4, p28 

    Describes the light emitting diode emergency exit signs from Bardic. Key features; Information on fluorescent lamps used.


Read the Article


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

Try another library?
Sign out of this library

Other Topics