Effect of ITO carrier concentration on the performance of organic light-emitting diodes

Furong Zhu; Keran Zhang; C. H. A. Huan; A. T. S. Wee; Ewald Guenther; Chua Soo Jin

doi:10.1557/PROC-598-BB11.11

Effect of ITO carrier concentration on the performance of organic light-emitting diodes

Furong Zhu
, Keran Zhang
, C. H. A. Huan
, A. T. S. Wee
, Ewald Guenther
, Chua Soo Jin

Department of Physics

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

The indium tin oxide (ITO) anodes for organic light emitting diode (OLED) were made from an oxidised target with In₂O₃ and SnO₂ in a weight proportion of 9:1 using the RF magnetron sputtering method. The comparable ITO anodes with different carrier concentrations were prepared by varying the hydrogen partial pressure during film deposition. The current-luminance-voltage characteristics of the devices indicated that a high carrier concentration in ITO plays a role in improving OLED performance. A maximum efficiency of 3.8 cd/A was achieved when an ITO anode with a higher carrier concentration of 9×10²⁰ cm^-3 was used in a fluorene based OLED. This efficiency is about 1.5 times higher than that of an identical device made with an ITO anode having a lower carrier concentration of 5×10²⁰ cm^-3. The increase in electroluminescent efficiency reflects an enhanced hole-injection in the device. We consider that enhanced hole injection is due to the reduced band bending in ITO when it has a high carrier concentration.

Original language	English
Article number	1111
Journal	MRS Online Proceedings Library
Volume	598
Issue number	1
DOIs	https://doi.org/10.1557/PROC-598-BB11.11
Publication status	Published - Dec 1999
Event	Electrical, Optical, and Magnetic Properties of Organic Solid-State Materials V - Boston, United States Duration: 28 Nov 1999 → 3 Dec 1999

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@article{044e4fe7c964470dba5bed3702e16608,

title = "Effect of ITO carrier concentration on the performance of organic light-emitting diodes",

abstract = "The indium tin oxide (ITO) anodes for organic light emitting diode (OLED) were made from an oxidised target with In2O3 and SnO2 in a weight proportion of 9:1 using the RF magnetron sputtering method. The comparable ITO anodes with different carrier concentrations were prepared by varying the hydrogen partial pressure during film deposition. The current-luminance-voltage characteristics of the devices indicated that a high carrier concentration in ITO plays a role in improving OLED performance. A maximum efficiency of 3.8 cd/A was achieved when an ITO anode with a higher carrier concentration of 9×1020 cm-3 was used in a fluorene based OLED. This efficiency is about 1.5 times higher than that of an identical device made with an ITO anode having a lower carrier concentration of 5×1020 cm-3. The increase in electroluminescent efficiency reflects an enhanced hole-injection in the device. We consider that enhanced hole injection is due to the reduced band bending in ITO when it has a high carrier concentration.",

author = "Furong Zhu and Keran Zhang and Huan, \{C. H. A.\} and Wee, \{A. T. S.\} and Ewald Guenther and Jin, \{Chua Soo\}",

note = "Publisher copyright: {\textcopyright} 2000, The Materials Research Society; Electrical, Optical, and Magnetic Properties of Organic Solid-State Materials V ; Conference date: 28-11-1999 Through 03-12-1999",

year = "1999",

month = dec,

doi = "10.1557/PROC-598-BB11.11",

language = "English",

volume = "598",

journal = "MRS Online Proceedings Library",

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TY - JOUR

T1 - Effect of ITO carrier concentration on the performance of organic light-emitting diodes

AU - Zhu, Furong

AU - Zhang, Keran

AU - Huan, C. H. A.

AU - Wee, A. T. S.

AU - Guenther, Ewald

AU - Jin, Chua Soo

PY - 1999/12

Y1 - 1999/12

N2 - The indium tin oxide (ITO) anodes for organic light emitting diode (OLED) were made from an oxidised target with In2O3 and SnO2 in a weight proportion of 9:1 using the RF magnetron sputtering method. The comparable ITO anodes with different carrier concentrations were prepared by varying the hydrogen partial pressure during film deposition. The current-luminance-voltage characteristics of the devices indicated that a high carrier concentration in ITO plays a role in improving OLED performance. A maximum efficiency of 3.8 cd/A was achieved when an ITO anode with a higher carrier concentration of 9×1020 cm-3 was used in a fluorene based OLED. This efficiency is about 1.5 times higher than that of an identical device made with an ITO anode having a lower carrier concentration of 5×1020 cm-3. The increase in electroluminescent efficiency reflects an enhanced hole-injection in the device. We consider that enhanced hole injection is due to the reduced band bending in ITO when it has a high carrier concentration.

AB - The indium tin oxide (ITO) anodes for organic light emitting diode (OLED) were made from an oxidised target with In2O3 and SnO2 in a weight proportion of 9:1 using the RF magnetron sputtering method. The comparable ITO anodes with different carrier concentrations were prepared by varying the hydrogen partial pressure during film deposition. The current-luminance-voltage characteristics of the devices indicated that a high carrier concentration in ITO plays a role in improving OLED performance. A maximum efficiency of 3.8 cd/A was achieved when an ITO anode with a higher carrier concentration of 9×1020 cm-3 was used in a fluorene based OLED. This efficiency is about 1.5 times higher than that of an identical device made with an ITO anode having a lower carrier concentration of 5×1020 cm-3. The increase in electroluminescent efficiency reflects an enhanced hole-injection in the device. We consider that enhanced hole injection is due to the reduced band bending in ITO when it has a high carrier concentration.

UR - https://www.cambridge.org/core/journals/mrs-online-proceedings-library-archive/article/abs/effect-of-ito-carrier-concentration-on-the-performance-of-organic-lightemitting-diodes/E25AAAC76CD210C1F93305B4C4D5828F

UR - https://www.scopus.com/pages/publications/0034510364

U2 - 10.1557/PROC-598-BB11.11

DO - 10.1557/PROC-598-BB11.11

M3 - Conference article

AN - SCOPUS:0034510364

SN - 1946-4274

VL - 598

JO - MRS Online Proceedings Library

JF - MRS Online Proceedings Library

IS - 1

M1 - 1111

T2 - Electrical, Optical, and Magnetic Properties of Organic Solid-State Materials V

Y2 - 28 November 1999 through 3 December 1999

ER -

Effect of ITO carrier concentration on the performance of organic light-emitting diodes

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