ITO-free large-area top-emission organic light-emitting diode by blade coating

Hao Wen Chang; Hsin-Fei Meng; Sheng Fu Horng; Hsiao-Wen Zan

doi:10.1016/j.synthmet.2015.11.025

ITO-free large-area top-emission organic light-emitting diode by blade coating

Hao Wen Chang, Hsin-Fei Meng^*, Sheng Fu Horng, Hsiao-Wen Zan

^*Corresponding author for this work

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

6 Scopus citations

Abstract

Large-area top-emitting organic light-emitting diodes (TEOLEDs) with multi-layer structure are successfully demonstrated using the solution-processable blade coating on ITO-free substrate. The semitransparent cathode of TEOLED is composed of lithium fluoride (LiF), aluminum (Al) and silver (Ag). The composition of 3 nm Al and 10 nm Ag has a transmittance of 56% and a sheet resistance of 11 Ω/□. It is applied to the green phosphorescence device with an emissive area of 2 cm by 2.5 cm. The maximum current efficiency is 25.2 cd/A with high light-emission uniformity within 10% variation. The large-area TEOLEDs show comparable current efficiency as the small-area devices with an emissive area of 2 mm by 2 mm (having the same device structure) and better efficiency than traditional large-area bottom-emitting devices. Cesium fluoride (CsF) and n-doped electron transport layer are applied to improve electron injection. At 6 V, the luminance is raised from 141 cd/m² to 502 cd/m² and 304 cd/m², respectively. In n-doped device, a simple Al/Ag cathode is used without LiF.

Original language	English
Pages (from-to)	19-24
Number of pages	6
Journal	Synthetic Metals
Volume	212
DOIs	https://doi.org/10.1016/j.synthmet.2015.11.025
State	Published - 1 Feb 2016

Keywords

Blade coating
ITO-free
Large area
Organic light-emitting diode
Solution process
Top emission

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10.1016/j.synthmet.2015.11.025

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title = "ITO-free large-area top-emission organic light-emitting diode by blade coating",

abstract = "Large-area top-emitting organic light-emitting diodes (TEOLEDs) with multi-layer structure are successfully demonstrated using the solution-processable blade coating on ITO-free substrate. The semitransparent cathode of TEOLED is composed of lithium fluoride (LiF), aluminum (Al) and silver (Ag). The composition of 3 nm Al and 10 nm Ag has a transmittance of 56% and a sheet resistance of 11 Ω/□. It is applied to the green phosphorescence device with an emissive area of 2 cm by 2.5 cm. The maximum current efficiency is 25.2 cd/A with high light-emission uniformity within 10% variation. The large-area TEOLEDs show comparable current efficiency as the small-area devices with an emissive area of 2 mm by 2 mm (having the same device structure) and better efficiency than traditional large-area bottom-emitting devices. Cesium fluoride (CsF) and n-doped electron transport layer are applied to improve electron injection. At 6 V, the luminance is raised from 141 cd/m2 to 502 cd/m2 and 304 cd/m2, respectively. In n-doped device, a simple Al/Ag cathode is used without LiF.",

keywords = "Blade coating, ITO-free, Large area, Organic light-emitting diode, Solution process, Top emission",

author = "Chang, {Hao Wen} and Hsin-Fei Meng and Horng, {Sheng Fu} and Hsiao-Wen Zan",

year = "2016",

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doi = "10.1016/j.synthmet.2015.11.025",

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T1 - ITO-free large-area top-emission organic light-emitting diode by blade coating

AU - Chang, Hao Wen

AU - Meng, Hsin-Fei

AU - Horng, Sheng Fu

AU - Zan, Hsiao-Wen

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Large-area top-emitting organic light-emitting diodes (TEOLEDs) with multi-layer structure are successfully demonstrated using the solution-processable blade coating on ITO-free substrate. The semitransparent cathode of TEOLED is composed of lithium fluoride (LiF), aluminum (Al) and silver (Ag). The composition of 3 nm Al and 10 nm Ag has a transmittance of 56% and a sheet resistance of 11 Ω/□. It is applied to the green phosphorescence device with an emissive area of 2 cm by 2.5 cm. The maximum current efficiency is 25.2 cd/A with high light-emission uniformity within 10% variation. The large-area TEOLEDs show comparable current efficiency as the small-area devices with an emissive area of 2 mm by 2 mm (having the same device structure) and better efficiency than traditional large-area bottom-emitting devices. Cesium fluoride (CsF) and n-doped electron transport layer are applied to improve electron injection. At 6 V, the luminance is raised from 141 cd/m2 to 502 cd/m2 and 304 cd/m2, respectively. In n-doped device, a simple Al/Ag cathode is used without LiF.

AB - Large-area top-emitting organic light-emitting diodes (TEOLEDs) with multi-layer structure are successfully demonstrated using the solution-processable blade coating on ITO-free substrate. The semitransparent cathode of TEOLED is composed of lithium fluoride (LiF), aluminum (Al) and silver (Ag). The composition of 3 nm Al and 10 nm Ag has a transmittance of 56% and a sheet resistance of 11 Ω/□. It is applied to the green phosphorescence device with an emissive area of 2 cm by 2.5 cm. The maximum current efficiency is 25.2 cd/A with high light-emission uniformity within 10% variation. The large-area TEOLEDs show comparable current efficiency as the small-area devices with an emissive area of 2 mm by 2 mm (having the same device structure) and better efficiency than traditional large-area bottom-emitting devices. Cesium fluoride (CsF) and n-doped electron transport layer are applied to improve electron injection. At 6 V, the luminance is raised from 141 cd/m2 to 502 cd/m2 and 304 cd/m2, respectively. In n-doped device, a simple Al/Ag cathode is used without LiF.

KW - Blade coating

KW - ITO-free

KW - Large area

KW - Organic light-emitting diode

KW - Solution process

KW - Top emission

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VL - 212

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ER -

ITO-free large-area top-emission organic light-emitting diode by blade coating

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Keywords

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