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Highly efficient blue organic light-emitting diodes using DPASN quantum well structure

Published online by Cambridge University Press:  11 June 2013

Ju-An Yoon,
You-Hyun Kim,
Nam Ho Kim,
Seung Il Yoo,
Sang Youn Lee and
Woo Young Kim
Ju-An Yoon
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, Korea
You-Hyun Kim
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, Korea
Nam Ho Kim
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, Korea
Seung Il Yoo
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, Korea
Sang Youn Lee
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, Korea
Woo Young Kim*
Affiliation:
Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, KoreaDepartment of Engineering Physics, McMaster University, Hamilton, Canada
*
*Email: jjuan25@naver.com
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Abstract

In this study, we fabricated blue OLEDs with quantum well structure (QWS) using four different blue emissive materials such as DPVBi, ADN and DPASN, and BAlq as QWS material. Conventional QWS blue OLEDs used to be composed of emissive layer and charge blocking layer with lower HOMO-LUMO energy level, but we designed triple emitting layer for more significant hole-electron recombination in EML and a wider region of exciton generation as forming QWS spontaneously. The structure of triple emitting layered blue OLED is ITO / NPB(700 Å) / X(100 Å) / BAlq(100 Å) /X (100 Å) / Bphen(300 Å) / Liq(20 Å) / Al(1200 Å) (X= DPVBi, ADN, DPASN). HOMO-LUMO energy levels of DPVBi, ADN, DPASN and BAlq were 2.8-5.9, 2.6-5.6, 2.3-5.2 and 2.9-5.9 eV, respectively. The maximum luminous efficiency was 5.32 cd/A at 3.5 V in a blue OLED with DPASN / BAlq / DPASN QWS.

Keywords

displayoptical propertiesorganic

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1567: Symposium JJ – Fundamental Processes in Organic Electronics , 2013, mrss13-1567-jj13-73
Copyright
Copyright © Materials Research Society 2013 

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