Blue phosphorescent dye as sensitizer and emitter for white organic light-emitting diodes

Gangtie Lei; Liduo Wang; Yong Qiu
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5403
Academic Journal
We demonstrate high-efficiency white organic light-emitting diodes with blue electrophosphorescent and red phosphor-sensitized electrofluorescent emission. The phosphorescent dye, bis[(4,6-difluorophenyl)-pyridinato-N,C2] (picolinato) Ir(III) (FIrpic) and the fluorescent dye, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl) (DCJTB) are co-doped into host material, N,N′-dicarbazolyl-1, 4-dimethene-benzene (DCB). The device with 8% (weight ratio) FIrpic and 0.4% (weight ratio) DCJTB exhibits white emission and the maximum current efficiency and luminance are 9.2 cd/A and 18 200 cd/m2, respectively. For comparison, a device without FIrpic is fabricated which has poor performance. These results indicate that the blue phosphorescent dye acts not only as emitter but also as phosphorescent sensitizer for fluorescent dye.


Related Articles

  • Effect of dye concentrations in blended-layer white organic light-emitting devices based on phosphorescent dyes. Pearson, C.; Cadd, D. H.; Petty, M. C.; Hua, Y. L. // Journal of Applied Physics;Sep2009, Vol. 106 Issue 6, p064516-1 

    The electronic and optoelectronic behavior of white organic light-emitting devices (OLEDs) based on blue (FIrpic) and red [Ir(piq)2(acac)] phosphorescent dyes doped into the same layer of a polyvinylcarbazole (PVK) host are reported. The conductivity of all the OLEDs studied appeared to be...

  • High peak luminance of molecularly dye-doped organic light-emitting diodes under intense voltage pulses. Wei, B.; Ichikawa, M.; Furukawa, K.; Koyama, T.; Taniguchi, Y. // Journal of Applied Physics;8/15/2005, Vol. 98 Issue 4, p044506 

    The performance and efficiency of molecularly doped organic light-emitting devices (OLEDs) using voltage pulses have been investigated. The maximum current density and peak luminance have been found to depend on the pulse duration and device size, which was attributed to the heat effect in...

  • Calculation of LED modules for highway lighting. Guttsait, E. // Journal of Communications Technology & Electronics;Aug2011, Vol. 56 Issue 8, p1000 

    The calculated distributions of the highway illuminance provided by light-emitting diode (LED) modules that can be used in available supports and arms are presented. Different variants of the arms with LEDs characterized by various luminous intensity curves and emission angles of 10 to 100°...

  • HIGH POWER WHITE LIGHT EMITTING DIODES AND MODULES WITH LIGHT FLUX OF UP TO 1500 LUMEN. Gofshtein-Gardt, Alexei L.; Kogan, Lev. M.; Rassokhin, Igor. T.; Soshchin, Naum R.; Turkin, Andrei N. // Light & Engineering;2014, Vol. 22 Issue 3, p29 

    The article briefly notes the achievements of the authors in developing of super-power phosphor white light emitting diodes (with light flux of up to 900 lm) and of light-emitting diode modules (light flux of up to 1500 lm).

  • Efficient simple structure red phosphorescent organic light emitting devices with narrow band-gap fluorescent host. Tae Jin Park; Woo Sik Jeon; Jung Joo Park; Sun Young Kim; Yong Kyun Lee; Jin Jang; Jang Hyuk Kwon; Pode, Ramchandra // Applied Physics Letters;3/17/2008, Vol. 92 Issue 11, p113308 

    Using a narrow band-gap fluorescent host material, bis(10-hydroxybenzo[h] quinolinato)beryllium complex, efficient red phosphorescent organic light emitting diodes (PHOLEDs) comprising two layers have been reported. Significantly low driving voltage of 4.5 V to reach a luminance of 1000 cd/m2 is...

  • Splitting of the recombination zone in organic light emitting diodes by dye doping. Berner, D.; Nuesch, F.; Tutiš, E.; Ma, C.; Wang, X.; Zhang, B.; Zuppiroli, L. // Journal of Applied Physics;4/1/2004, Vol. 95 Issue 7, p3749 

    In organic light emitting devices, doping of the electroactive organic layer with highly luminescent molecules has been shown to considerably increase device performance and lifetime. In most cases, the doping molecule does not act as a charge donor or an acceptor as in classical semiconductors,...

  • Carrier trapping and efficient recombination of electrophosphorescent device with stepwise doping profile. Byung Doo Chin; Min Chul Suh; Mu-Hyun Kim; Seong Taek Lee; Hye Dong Kim; Ho Kyoon Chung // Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p133505 

    We have presented a physical concept for enhancing efficiency and lifetime of doped electrophosphorescent organic light-emitting devices. In order to provide a control parameter for higher device performance, a stepwise doping concentration profile at the emission layer was prepared. A more than...

  • Efficient white-light-emitting diodes based on polymer codoped with two phosphorescent dyes. Yunhua Xu; Junbiao Peng; Jiaxing Jiang; Wei Xu; Wei Yang; Yong Cao // Applied Physics Letters;11/7/2005, Vol. 87 Issue 19, p193502 

    Efficient white-light-emitting diodes (WPLEDs) based on a polymer codoped with two phosphorescent dyes were fabricated by the spin-casting method. Polyhedral oligomeric silsesquioxane-terminated poly(9,9-dioctylfluorene) (PFO-poss) was used as the host and blue light emitter. Phosphorescent...

  • Top 3 Trends in Colored LED Applications.  // Buildings;May2014, Vol. 108 Issue 5, p14 

    The article reports on top three trends in the use of colored light-emitting diode (LED) as of May 2014, including upgrading of efficiency, the ability to change lighting as required, and the shift to systems thinking rather than by individual components.


Read the Article


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

Try another library?
Sign out of this library

Other Topics