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High Efficiency Phosphorescent Blue Organic Light-Emitting Diodes Using Double Emitting Layer

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Abstract:

We have demonstrated a highly efficient blue phosphorescent organic light emitting diodes (PHOLED) using iridium (III) bis[(4,6-di-fluoropheny)-pyridinato-N,C2] picolinate doped in double emitting layers (D-EML), N,N-dicarbazolyl-3,5-benzene (mCP) and p-bis (triphenylsilyly)benzene (UGH2). D-EML layers were employed to broaden the exciton formation zone and confine excitons. The optimized blue PHOLEDs having mCP/UGH2 as D-EML with a thickness of 200/100 Å, exhibited a peak external quantum efficiency of 11.44%, power efficiency of 16.8 lm/W, luminous efficiency of 23.14 cd/A, and Commission Internationale de I'Eclairage coordinates of (0.17, 0.33).

Keywords: BLUE PHOSPHORESCENT ORGANIC LIGHT EMITTING DIODES; DOUBLE EMITTING LAYERS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3704

Publication date: May 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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