Improvement in carrier transport and recombination of white phosphorescent organic light-emitting devices using a composite blue emitter

Meng-Ting Lee; Jin-Sheng Lin; Miao-Tsai Chu; Mei-Rurng Tseng
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p133306
Academic Journal
We demonstrate high-efficiency white phosphorescent organic light-emitting devices (PHOLEDs) based on a yellow and composite blue emitters. The composite blue emitter is constructed from a wide-band-gap host, organometallic iridium dopant, and a carrier-transporting material. Under the same driving current density and emissive color, the current efficiency of the white PHOLEDs can be enhanced by a factor of 1.4 comparing to that of using typical blue emitter composed of host and dopant only. Attaching an outcoupling enhancement film onto glass substrate, the white PHOLEDs with a current efficiency of 47 cd/A, a power efficiency of 32 lm/W, and a CIEx,y (CIE: Commission Internationale d'Eclairage) of (0.40,0.44) at a practical brightness of 1000 cd/m2 can be achieved.


Related Articles

  • Low-voltage, high-efficiency blue phosphorescent organic light-emitting devices. Meng-Ting Lee; Jin-Sheng Lin; Miao-Tsai Chu; Mei-Rurng Tseng // Applied Physics Letters;4/28/2008, Vol. 92 Issue 17, p173305 

    Low-voltage, high-efficiency blue phosphorescent organic light-emitting devices based on a composite emitter, including a wide-band-gap host, a carrier-transporting material, and an organometallic iridium dopant, have been demonstrated. The devices exhibit an external quantum efficiency of 12%,...

  • Improved color stability in white phosphorescent organic light-emitting diodes using charge confining structure without interlayer. Kim, Sung Hyun; Jang, Jyongsik; Lee, Jun Yeob // Applied Physics Letters;9/17/2007, Vol. 91 Issue 12, p123509 

    Color stability of white organic light-emitting diodes was improved by using a charge confining device structure, which can confine charges at the center of the emitting layer. A red phosphorescent emitting layer was sandwiched between blue phosphorescent emitting layers and there was little...

  • 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...

  • Coordination-complex polymer as an organic conductor for organic light-emitting diodes. Soon-Min Seo; Kim, Joon H.; Jeong-Yong Park; Lee, Hong H. // Applied Physics Letters;10/31/2005, Vol. 87 Issue 18, p183503 

    A coordination complex of poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT-PSS) is used to enhance the performance of organic light-emitting diodes. Use of the coordination complex formed by copper results in more than doubling the device lifetime when the complex is used as the...

  • Electrically detected magnetic resonance investigations of gallium phosphide green light-emitting diodes. Reinacher, N. M.; Brandt, M. S.; Stutzmann, M. // Journal of Applied Physics;10/15/1996, Vol. 80 Issue 8, p4541 

    Presents information on a study that investigated the transport processes and degradation of GaP:N green light-emitting diodes using electrically detected magnetic response. Experimental procedure; Results and discussion on the study; Conclusions.

  • Investigation of GaNxP1-x/GaP LED Structure Optical Properties. Peternai, L.; Kovac, J.; Jakabovic, J.; Gottschalch, V.; Rheinlaender, B. // Journal of Electronic Materials;Apr2006, Vol. 35 Issue 4, p654 

    GaNxP1-x alloy represents a novel compound semiconductor that has attracted considerable interest as a candidate for realization of light emitting diodes (LEDs) in the green-red range of the visible spectra. Simple GaNxP1-x/GaP LED structures grown by low-preassure metalorganic vapor phase...

  • CHARACTERIZE YOUR LEDs FOR ALMOST ALL OCCASIONS. Dirjish, Mat // Electronic Design;3/26/2010, Vol. 58 Issue 4, p42 

    The article provides an overview on the applications and types of light-emitting diode (LED). It defines LED as a semiconductor which generates visible light of a particular color. It presents a brief history of LED wherein the first LED was attributed to researcher Nicholas Holonyak circa 1962....

  • Transformation of a Short-Wavelength Emission Band of a Double-Charged Intrinsic Acceptor into a Long-Wavelength Band in GaSb-Based LEDs. Grebenshchikova, A.; Imenkov, A.N.; Zhurtanov, B.E.; Danilova, T.N.; Sipovskaya, M.A.; Blasenko, N.V.; Yakovlev, Yu.P. // Semiconductors;Jun2004, Vol. 38 Issue 6, p717 

    GaSb-based crystals shaped like a stepped pyramid with smoothed steps are obtained. The crystals are intended for the fabrication of light-emitting diodes in which the short-wavelength emission band of a double-charged intrinsic acceptor is transformed into the long-wavelength band without loss...

  • Trends and Tradeoffs in Powering LED Luminaires. Weir, Bernie // LED Journal;Nov/Dec2008, Vol. 3 Issue 6, p8 

    The article deals with trends and factors to consider in power schemes for light emitting diode luminaires. LED arrangement is mentioned as an important step to consider to achieve the required output level and achieve uniform brightness. Regulatory considerations related to voltage output level...


Read the Article


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

Try another library?
Sign out of this library

Other Topics