التفاصيل البيبلوغرافية
| العنوان: |
Effect of dye concentrations in blended-layer white organic light-emitting devices based on phosphorescent dyes. |
| المؤلفون: |
Pearson, C., Cadd, D. H., Petty, M. C., Hua, Y. L. |
| المصدر: |
Journal of Applied Physics; Sep2009, Vol. 106 Issue 6, p064516-1-064516-10, 10p, 1 Diagram, 2 Charts, 14 Graphs |
| مصطلحات موضوعية: |
LIGHT emitting diodes, ELECTROLUMINESCENT devices, LIGHT sources, LUMINESCENCE, ELECTROLUMINESCENCE, OPTOELECTRONICS, DYES & dyeing |
| مستخلص: |
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 dominated by space-charge injection effects, exhibiting a current I versus voltage V dependence of the form I∝Vn, with n≈7 at applied voltages at which electroluminescence was observed. Systematic studies of the current versus voltage and light-emitting behavior of the OLEDs have identified different excitation processes for the two dyes. It is suggested that electroluminescence from the FIrpic molecules originates by direct transfer of the exciton energy from the PVK to the dye molecules, while the process of light emission from the Ir(piq)2(acac) molecules involves carrier trapping. The efficiency of the devices can be tuned, to some extent, by varying the thickness of the organic film. Luminous efficiencies and luminous power efficiencies of 8 cd A-1 and 3 lm W-1 were measured for these blended-layer OLEDs, with Commission Internationale de l’Eclairage coordinates of 0.35, 0.35. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Find this article in full text from Scitation.