Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

Jae Wook Kang; Se Hyung Lee; Hyung Dol Park; Won Ik Jeong; Kyung Mo Yoo; Young Seo Park; Jang Joo Kim

doi:10.1063/1.2745224

Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

Jae Wook Kang
, Se Hyung Lee
, Hyung Dol Park
, Won Ik Jeong
, Kyung Mo Yoo
, Young Seo Park
, Jang Joo Kim^*

^*Corresponding author for this work

Department of Flexible and Printable Electronics

Korea Institute of Machinery and Materials
Seoul National University

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

230 Scopus citations

Abstract

The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. Low roll-off of efficiency in a PhOLED was achieved using dual emitting layers (D-EMLs) by confining the exciton formation near the interface between the emitting layers. The external quantum efficiency was maintained almost constant up to 22 mA cm2 (10 000 cd m2) by adopting the D-EMLs in Ir (ppy)3 based PhOLEDs, resulting in high external quantum efficiency (ext =13.1%) at high luminance.

Original language	English
Article number	223508
Journal	Applied Physics Letters
Volume	90
Issue number	22
DOIs	https://doi.org/10.1063/1.2745224
State	Published - 2007

Access to Document

10.1063/1.2745224

Cite this

@article{30faa732c2084d50b77cfe8a31a18692,

title = "Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes",

abstract = "The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. Low roll-off of efficiency in a PhOLED was achieved using dual emitting layers (D-EMLs) by confining the exciton formation near the interface between the emitting layers. The external quantum efficiency was maintained almost constant up to 22 mA cm2 (10 000 cd m2) by adopting the D-EMLs in Ir (ppy)3 based PhOLEDs, resulting in high external quantum efficiency (ext =13.1\%) at high luminance.",

author = "Kang, \{Jae Wook\} and Lee, \{Se Hyung\} and Park, \{Hyung Dol\} and Jeong, \{Won Ik\} and Yoo, \{Kyung Mo\} and Park, \{Young Seo\} and Kim, \{Jang Joo\}",

year = "2007",

doi = "10.1063/1.2745224",

language = "English",

volume = "90",

journal = "Applied Physics Letters",

issn = "0003-6951",

number = "22",

}

TY - JOUR

T1 - Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

AU - Kang, Jae Wook

AU - Lee, Se Hyung

AU - Park, Hyung Dol

AU - Jeong, Won Ik

AU - Yoo, Kyung Mo

AU - Park, Young Seo

AU - Kim, Jang Joo

PY - 2007

Y1 - 2007

N2 - The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. Low roll-off of efficiency in a PhOLED was achieved using dual emitting layers (D-EMLs) by confining the exciton formation near the interface between the emitting layers. The external quantum efficiency was maintained almost constant up to 22 mA cm2 (10 000 cd m2) by adopting the D-EMLs in Ir (ppy)3 based PhOLEDs, resulting in high external quantum efficiency (ext =13.1%) at high luminance.

AB - The authors demonstrate that the reduction of quantum efficiency with increasing current density in phosphorescent light emitting diodes (PhOLEDs) is related to the formation of excitons in hole transporting layer based on the analysis of emission spectra and exciton formation zone. Low roll-off of efficiency in a PhOLED was achieved using dual emitting layers (D-EMLs) by confining the exciton formation near the interface between the emitting layers. The external quantum efficiency was maintained almost constant up to 22 mA cm2 (10 000 cd m2) by adopting the D-EMLs in Ir (ppy)3 based PhOLEDs, resulting in high external quantum efficiency (ext =13.1%) at high luminance.

UR - https://www.scopus.com/pages/publications/34249877393

U2 - 10.1063/1.2745224

DO - 10.1063/1.2745224

M3 - Journal article

AN - SCOPUS:34249877393

SN - 0003-6951

VL - 90

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 223508

ER -

Low roll-off of efficiency at high current density in phosphorescent organic light emitting diodes

Abstract

Access to Document

Other files and links

Fingerprint

Cite this