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

Gwijeong Cho; Hyena Lee; Sungho Woo; Sungho Nam; Hwajeong Kim; Youngkyoo Kim

doi:10.1039/c0nr00496k

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

Gwijeong Cho, Hyena Lee, Sungho Woo, Sungho Nam, Hwajeong Kim, Youngkyoo Kim

Division of Energy Techonology

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English
Pages (from-to)	1073-1077
Number of pages	5
Journal	Nanoscale
Volume	3
Issue number	3
DOIs	https://doi.org/10.1039/c0nr00496k
State	Published - Mar 2011

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title = "Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices",

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.",

author = "Gwijeong Cho and Hyena Lee and Sungho Woo and Sungho Nam and Hwajeong Kim and Youngkyoo Kim",

year = "2011",

month = mar,

doi = "10.1039/c0nr00496k",

language = "English",

volume = "3",

pages = "1073--1077",

journal = "Nanoscale",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices

AU - Cho, Gwijeong

AU - Lee, Hyena

AU - Woo, Sungho

AU - Nam, Sungho

AU - Kim, Hwajeong

AU - Kim, Youngkyoo

PY - 2011/3

Y1 - 2011/3

N2 - 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.

AB - 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.

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U2 - 10.1039/c0nr00496k

DO - 10.1039/c0nr00496k

M3 - Article

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AN - SCOPUS:79952646856

SN - 2040-3364

VL - 3

SP - 1073

EP - 1077

JO - Nanoscale

JF - Nanoscale

IS - 3

ER -

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

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