Simple color tuning of phosphorescent dendrimer light emitting diodes

Namdas, Ebinazar B., Anthopoulos, Thomas D., Samuel, Ifor D. W., Frampton, Michael J., Lo, Shih-Chun and Burn, Paul L. (2005) Simple color tuning of phosphorescent dendrimer light emitting diodes. Applied Physics Letters, 86 16: 161104-1-161104-3. doi:10.1063/1.1899256

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Author Namdas, Ebinazar B.
Anthopoulos, Thomas D.
Samuel, Ifor D. W.
Frampton, Michael J.
Lo, Shih-Chun
Burn, Paul L.
Title Simple color tuning of phosphorescent dendrimer light emitting diodes
Journal name Applied Physics Letters   Check publisher's open access policy
ISSN 0003-6951
Publication date 2005-04-18
Sub-type Article (original research)
DOI 10.1063/1.1899256
Open Access Status File (Publisher version)
Volume 86
Issue 16
Start page 161104-1
End page 161104-3
Total pages 3
Place of publication Melville, NY, U.S.A.
Publisher American Institute of Physics
Language eng
Subject 02 Physical Sciences
0306 Physical Chemistry (incl. Structural)
Formatted abstract
A simple way of tuning the emission color in solution processed phosphorescent organic light emitting diodes is demonstrated. For each color a single emissive spin-coated layer consisting of a blend of three materials, a fac-tris(2-phenylpyridyl)iridium (III) cored dendrimer (Ir–G1) as the green emitter, a heteroleptic [bis(2‐phenylpyridyl)-2-(2′-benzo[4,5α]thienyl)pyridyl]iridium (III) cored dendrimer [Ir(ppy)2btp] as the red emitter, and 4,4′-bis(N-carbazolyl) biphenyl (CBP) as the host was employed. By adjusting the relative amount of green and red dendrimers in the blends, the color of the light emission was tuned from green to red. High efficiency two layer devices were achieved by evaporating a layer of electron transporting 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene (TPBI) on top of the spin-coated emissive layer. A brightness of 100–cd/m2 was achieved at drive voltages in the range 5.3–7.3 V. The peak external efficiencies at this brightness ranged from 31 cd/A (18 lm/W) to 7 cd/A (4 lm/W).
© 2005 American Institute of Physics
Keyword Physics, Applied
Organic semiconductors
Organic light emitting diodes
Thin film devices
Semiconductor thin films
Flat panel displays
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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Created: Wed, 19 Sep 2007, 18:42:34 EST