White luminescence from single-layer devices of nonresonant polymer blends

Brovelli, Sergio; Hao Guan; Winroth, Gustaf; Fenwick, Oliver; Di Stasio, Francesco; Daik, Rusli; Feast, W. James; Meinardi, Francesco; Cacialli, Franco
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p213301
Academic Journal
Poly(9,9′-dioctyl fluorene) (F8) and poly(4,4′-diphenylene diphenylvinylene) (PDPV) are conjugated polymers with optical transitions that are nonresonant thanks to the particular structural features of PDPV that yield a very large Stokes’ shift (∼1.14 eV) between absorption and emission spectra. We present steady-state and time-resolved photoluminescence (PL) experiments showing that F8:PDPV blends are “optically disconnected” systems for which the emission spectra and PL quantum yields are the linear combination of the contributions of the individual constituents with weights given by the respective absorption coefficients and concentration in the films. Single-layer light-emitting diodes incorporating F8:PDPV blends show white electroluminescence resulting from the simultaneous exploitation of the spectral features of both blend constituents (Commission Internationale de l’Eclairage, CIE, coordinates: x=0.27 and y=0.36, in the case of 8:2 F8:PDPV molar ratio).


Related Articles

  • Intense green-emitting Sr2LiSiO4F:Eu2+ phosphor for n-UV white LEDs. Xinmin Zhang; Jong Su Kim // Applied Physics A: Materials Science & Processing;Nov2009, Vol. 97 Issue 3, p549 

    Eu2+-activated Sr2LiSiO4F phosphors were synthesized at 900°C by solid-state reaction in reducing atmosphere, and their photoluminescence (PL) properties were systematically investigated by diffuse reflection spectra, PL excitation and emission spectra, and by the fluorescence decay curve....

  • White organic light-emitting diodes based on spectral broadening in electroluminescence due to formation of interfacial exciplexes. Singh, Samarendra P.; Mohapatra, Y. N.; Qureshi, M.; Sundar Manoharan, S. // Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113505 

    We demonstrate white organic light-emitting diodes (OLEDs) having spectral width of approximately 260 nm in electroluminescence (EL) in a simple bilayer structure, consisting of TPD and zinc benzothiazole, without taking recourse to complex strategies such as blending and doping. The EL is...

  • Spectral investigation for phosphorescent polymer light-emitting devices with doubly doped phosphorescent dyes. Fangzhong Shen; Hong Xia; Zhang, Chengbo; Lin, Dong; Xiaodong Liu; Yuguang Ma // Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p55 

    The photoluminescence and electroluminescence (EL) spectral characteristics of two phosphorescent dyes, green fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)[sub 3]] and red tris-(4,7-diphenyl-1,10-phenanthroline)rhenium dications [Ru(4,7-Ph[sub 2]-phen)[sub 3]][sup 2+], doubly doped...

  • Nanoscale dynamic inhomogeneities in electroluminescence of conjugated polymers. Hatano, Tatsuhiko; Nozue, Shuho; Habuchi, Satoshi; Vacha, Martin // Journal of Applied Physics;Sep2011, Vol. 110 Issue 5, p053111 

    We report the observation and characterization of dynamic spatial heterogeneities in the electroluminescence (EL) of conjugated polymer organic light-emitting diodes via high-sensitivity fluorescence microscopy. The active layers of the single-layer devices are polymers of the poly(phenylene...

  • Optical properties of blue light-emitting diodes in the InGaN/GaN system at high current densities. Bochkareva, N. I.; Gorbunov, R. I.; Klochkov, A. V.; Lelikov, Yu. S.; Martynov, I. A.; Rebane, Yu. T.; Belov, A. S.; Shreter, Yu. G. // Semiconductors;Nov2008, Vol. 42 Issue 11, p1355 

    The current-voltage and brightness-voltage characteristics and the electroluminescence spectra of blue InGaN/GaN-based light-emitting diodes are studied to clarify the cause of the decrease in the emission efficiency at high current densities and high temperatures. It is found that the linear...

  • Characteristics of an organic light-emitting diode utilizing a phosphorescent, shallow hole trap. Campbell, I. H.; Crone, B. K. // Applied Physics Letters;10/23/2006, Vol. 89 Issue 17, p172108 

    The authors demonstrate the effects of incorporating a phosphorescent, shallow hole trap in an organic light-emitting diode. They present device properties as a function of trap concentration including electron only, hole only, and bipolar current-voltage (I-V) characteristics,...

  • Effect of annealing on the performance of CrO3/ZnO light emitting diodes. Xi, Y. Y.; Ng, A. M. C.; Hsu, Y. F.; Djurišćic, A. B.; Huang, B. Q.; Ge, L.; Chen, X. Y.; Chan, W. K.; Tam, H. L.; Cheah, K. W. // Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p203502 

    Heterojunction CrO3/ZnO light emitting diodes have been fabricated. Their performance was investigated for different annealing temperature for ZnO nanorods. Annealing in oxygen atmosphere had significant influence on carrier concentration in the nanorods, as well as on the emission spectra of...

  • Measuring the profile of the emission zone in polymeric organic light-emitting diodes. Gather, Malte C.; Flämmich, Michael; Danz, Norbert; Michaelis, Dirk; Meerholz, Klaus // Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263301 

    The profile of the emission zone (PEZ) in the emissive layer (EML) of polymeric organic light-emitting diodes (OLEDs) is determined by fitting the measured electroluminescence spectrum of the device with a series of simulated spectra that correspond to different emitter locations. The studied...

  • Relating the physical structure and optical properties of conjugated polymers using neutron reflectivity in combination with photoluminescence spectroscopy. Mitchell, William J.; Burn, Paul L.; Thomas, Robert K.; Fragneto, Giovanna; Markham, Jonathan P.J.; Samuel, Ifor D.W. // Journal of Applied Physics;3/1/2004, Vol. 95 Issue 5, p2391 

    Understanding the effect of physical structure and the role of interfaces is critical for gaining insight into the optoelectronic properties of conjugated polymers and their behavior in semiconductor devices such as organic light-emitting diodes and photovoltaic cells. We have developed an in...


Read the Article


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

Try another library?
Sign out of this library

Other Topics