Enhancement of hole injection using ozone treated Ag nanodots dispersed on indium tin oxide anode for organic light emitting diodes

Journal Article · Mon Apr 16 00:00:00 EDT 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2719153· OSTI ID:20960232

Moon, Jong-Min; Bae, Jung-Hyeok; Jeong, Jin-A; Jeong, Soon-Wook; Park, No-Jin; Kim, Han-Ki; Kang, Jae-Wook; Kim, Jang-Joo; Yi, Min-Su ^[1]

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1. School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology (KIT), Gumi 730-701 (Korea, Republic of)

The authors report the enhancement of hole injection using an indium tin oxide (ITO) anode covered with ultraviolet (UV) ozone-treated Ag nanodots for fac tris (2-phenylpyridine) iridium Ir(ppy){sub 3}-doped phosphorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy and UV-visible spectrometer analysis exhibit that UV-ozone treatment of the Ag nanodots dispersed on the ITO anode leads to formation of Ag{sub 2}O nanodots with high work function and high transparency. Phosphorescent OLEDs fabricated on the Ag{sub 2}O nanodot-dispersed ITO anode showed a lower turn-on voltage and higher luminescence than those of OLEDs prepared with a commercial ITO anode. It was thought that, as Ag nanodots changed to Ag{sub 2}O nanodots by UV-ozone treatment, the decrease of the energy barrier height led to the enhancement of hole injection in the phosphorescent OLEDs.

• OSTI ID: 20960232
• Journal Information: Applied Physics Letters, Vol. 90, Issue 16; Other Information: DOI: 10.1063/1.2719153; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANODES
BEAM INJECTION
DOPED MATERIALS
ELECTRIC POTENTIAL
HOLES
INDIUM COMPOUNDS
IRIDIUM
LIGHT EMITTING DIODES
ORGANIC SEMICONDUCTORS
OZONE
PHOSPHORESCENCE
QUANTUM DOTS
SILVER OXIDES
SPECTROMETERS
TIN OXIDES
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
WORK FUNCTIONS
X-RAY PHOTOELECTRON SPECTROSCOPY