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Enhancement of the Luminance Efficiency in Organic Light-Emitting Devices with p-Substituted Phenylphosphonic-Acid Self-Assembled Monolayers

Title
Enhancement of the Luminance Efficiency in Organic Light-Emitting Devices with p-Substituted Phenylphosphonic-Acid Self-Assembled Monolayers
Author
김태환
Keywords
Organic Light-Emitting Device; Self-Assembled Mono layer; Phosphonic Acid; Functional Group of SAM; Operating Voltage; Current Efficiency
Issue Date
2015-07
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v. 15, no. 7, Page. 5062-5065
Abstract
Organic light-emitting devices (OLEDs) containing self-assembled nnonolayers (SAMs) prepared by using p-substituted phenylphosponic acids on indium-tin-oxide electrodes were fabricated and examined to understand the substituent effect of the SAMs on the device performance. OLEDs modified by using (4-methoxyphenyl)phosphonic acid (MOPPA) SAMs or (4-chlorophenyl)phosphonic acid (CPPA) SAMs, both with electron withdrawing groups, had enhanced hole injection, reduced operating voltage, and remarkably increased current density and luminance efficiency compared with those without SAMs. The luminance efficiency which was the ratio of luminous flux to power for OLEDs containing CPPA SAMs and that for the OLEDs containing MOPPA SAMs were enhanced 2.2 and 1.9 times, respectively, in comparison with that of OLEDs without SAMs. CPPA SAMs significantly reduced the operating voltage of OLED by 24.8% compared with OLEDs without SAMs.
URI
http://www.ingentaconnect.com/content/asp/jnn/2015/00000015/00000007/art00043http://hdl.handle.net/20.500.11754/26559
ISSN
1533-4880; 1533-4899
DOI
10.1166/jnn.2015.10366
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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