Back to articles
Volume: 16 | Article ID: art00093_1
Chemical Aging, Charge Transport, and Electroluminescence in Alq3-based Organic Light-Emitting Diodes
  DOI :  10.2352/ISSN.2169-4451.2000.16.1.art00093_1  Published OnlineJanuary 2000

Conduction in aluminum(III) 8-hydroxyquinoline (Alq3) was modeled based on trap-charge limited conduction of electrons in the bulk. The evolution of a narrow Gaussian distribution of localized trap states below the lowest unoccupied molecular orbital (LUMO) of Alq3, lying against a natural exponential background, was used to explain changes in the current-voltage characteristic and external quantum efficiency with time observed by many researchers for organic light-emitting diodes. Based on the change of the shape of the J-V curve, the depth of the electron trap states that were formed during aging was about 0.25 eV below the LUMO of Alq3. An increase in drive voltage and decrease in efficiency is predicted with aging by this model for current densities in a reasonable range, assuming that the evolved trap states are non-emissive and also non-quenching. The products of chemical aging can account for the generation of traps at the observed depth.

Subject Areas :
Views 3
Downloads 0
 articleview.views 3
 articleview.downloads 0
  Cite this article 

Keith A. Higginson, Mathew K. Mathai, Faquir Jain, Fotios Papadimitrakopoulos, Bing R. Hsieh, "Chemical Aging, Charge Transport, and Electroluminescence in Alq3-based Organic Light-Emitting Diodesin Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP16),  2000,  pp 354 - 357,

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2000
NIP & Digital Fabrication Conference
nip digi fabric conf
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA