Organic light-emitting devices for illumination quality white light

Duggal, Anil R.; Shiang, J. J.; Heller, Christian M.; Foust, Donald F.
May 2002
Applied Physics Letters;5/13/2002, Vol. 80 Issue 19, p3470
Academic Journal
A method of generating white light by combining a blue organic light-emitting diode with a down-conversion phosphor system is presented. It is demonstrated that the use of the down-conversion phosphor system actually leads to an overall power efficiency increase, an effect attributed to the high quantum efficiency of phosphor materials and the presence of light scattering in the phosphor layers. It is also shown that this approach permits the generation of illumination quality white light over the full range of color temperatures required for lighting applications. For the model device demonstrated in this work, an overall electrical to optical power conversion efficiency of 1.3% was achieved at a brightness of 1080 cd/m[sup 2]. © 2002 American Institute of Physics.


Related Articles

  • The Evolution of LED in Studio Lighting. JOHNSTON, CRAIG // TV Technology;Oct2015, Vol. 33 Issue 17, p30 

    No abstract available.

  • White light-emitting diodes of GaN-based Sr[sub 2]SiO[sub 4]:Eu and the luminescent properties. Park, Joung Kyu; Lim, Mi Ae; Kim, Chang Hae; Park, Hee Dong; Park, Joon Taik; Choi, Se Young // Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p683 

    We have synthesized a Eu[sup 2+]-activated Sr[sub 2]SiO[sub 4] yellow phosphor and investigated an attempt to develop white light-emitting diodes (LEDs) by combining it with a GaN blue LED chip. Two distinct emission bands from the GaN-based LED and the Sr[sub 2]SiO[sub 4]:Eu phosphor are...

  • COLOUR LIGHT EMITTING DIODES BASED ON PHOSPHORS EXCITED BY VIOLET RADIATION OF INGAAIN P-N HETEROSTRUCTURE. Bolshukhin, Vladimir; Galchina, Nina; Kogan, Lev; Portnyagin, Yury; Soshchin, Naum // Light & Engineering;2013, Vol. 21 Issue 1, p16 

    Color light emitting diodes (LED) of dark blue, green, yellow and red colour based on specially developed phosphors excited by violet radiation of In-GaAlN p-n heterostructure are developed. These new phosphors and LEDs are described. Relative spectra and lighting parameters of the LEDs, which...

  • ON LIMIT LIGHT AND COLOUR CHARACTERISTICS OF WHITE LIGHT EMITTING DIODES. Yeliseev, Nikolai; Reshenov, Stanislav // Light & Engineering;2013, Vol. 21 Issue 1, p67 

    The problem of development of white light emitting diodes (WLED) is considered. These diodes are distinguished by a combination of high luminous efficacy and high quality of colour rendition. Design evaluations of extremely high colour rendering indices of WLEDs with colour crystals and of WLEDs...

  • Quantum dot phosphors increase light from LEDs. Bush, Steve // Electronics Weekly;6/25/2008, Issue 2343, p6 

    The article reports that researchers at the University of Glasgow in Scotland, are using a combination of quantum dot phosphors with photonic crystals to increase the light output of light emitting diodes (LEDs) in lighting applications. Researcher Faiz Rahman said that the problem with all LEDs...

  • White LEDs get hotter--in intensity. Schweber, Bill // EDN;6/23/2005, Vol. 50 Issue 13, p20 

    The article describes a way developed by researchers at Rensselaer Polytechnic Institute to achieve extract more light from white light emitting diodes (LED). With their scattered-photon-extraction approach, they move the phosphor that produces the visible white light away from the semiconductor...

  • Organic optoelectronics: White LED. Graydon, Oliver // Nature Photonics;Aug2013, Vol. 7 Issue 8, p585 

    The article presents information on a polymer light-emitting diode (LED) developed by scientists in China, that can emit white light without using colour-converting phosphors, dyes or polymer blends.

  • High-efficiency orange and yellow organic light-emitting devices using platinum(II) complexes containing extended Ï€-conjugated cyclometalated ligands as dopant materials. Yan, Bei-Ping; Cheung, Cecil C. C.; Kui, Steven C. F.; Roy, V. A. L.; Che, Chi-Ming; Xu, Shi-Jie // Applied Physics Letters;8/6/2007, Vol. 91 Issue 6, p063508 

    Two luminescent platinum(II) complexes 1 and 2 containing extended π-conjugated cyclometalated ligands have been used as dopant materials for the construction of two high-efficiency organic light-emitting devices I and II. Device I (containing dopant 1) emits orange emission and exhibits a...

  • Nontoxic QD red phosphor leads to high-quality warm-white LEDs.  // Laser Focus World;Mar2014, Vol. 50 Issue 3, p10 

    The article reports on a research from phosphor manufacturer LumiSands and the University of Washington which developed a quantum dot (QD)-based red phosphor that leads to high-quality warm-white light-emitting diodes (LEDs).


Read the Article


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

Try another library?
Sign out of this library

Other Topics