Issue 3, 2011
From the journal:

Nanoscale

Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices†

Gwijeong Cho,abc   Hyena Lee,a   Sungho Woo,ab   Sungho Nam,a   Hwajeong Kim*ad  and  Youngkyoo Kim*ad  

* Corresponding authors

a Organic Nanoelectronics Laboratory, Department of Chemical Engineering, Kyungpook National University, Daegu, Republic of Korea
E-mail: ykimm@knu.ac.kr, khj217@knu.ac.kr
Web: http//one.knu.ac.kr
Fax: +82 53 950 6615
Tel: +82 53 950 5616

b Division of Nano and Bio Technology, DGIST, Daegu, Republic of Korea

c OLED Device Development Team, LG Display Co., Ltd., Gumi City, Republic of Korea

d Priority Research Center, Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu, Republic of Korea

Abstract

We report thermally stable diimide nanoclusters that could potentially replace the conventional thick electron transport layer (ETL) in organic light-emitting devices (OLEDs). Bis-[1,10]phenanthrolin-5-yl-bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic diimide (Bphen-BCDI) was synthesized from the corresponding dianhydride and amine moieties, and its purified product exhibited a high glass transition temperature (232 °C) and a wide band gap (3.8 eV). The Bphen-BCDI subnanolayers deposited on substrates were found to form organic nanoclusters, not a conventional layer. The OLED made with a subnanolayer of Bphen-BCDI nanoclusters, instead of a conventional ETL, showed greatly improved efficiency (about 2-fold) compared with an OLED without the diimide nanoclusters. The role of the BPhen-BCDI nanoclusters was assigned to hole trapping and electron injection in the present OLED structure.

Graphical abstract: Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices

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Article information

DOI
https://doi.org/10.1039/C0NR00496K
Article type
Paper
Submitted
13 Jul 2010
Accepted
25 Oct 2010
First published
20 Dec 2010

Nanoscale, 2011,3, 1073-1077

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Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices

G. Cho, H. Lee, S. Woo, S. Nam, H. Kim and Y. Kim, Nanoscale, 2011, 3, 1073 DOI: 10.1039/C0NR00496K

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