Efficiency Improvement of OLED by Aquaregia and RCA Treatment of ITO Substrate

Choi, Gyu-Chae; Kim, Dong-Eun; Park, Jun‐Woo; Kim, Byoung-Sang; Kwon, Young−Soo

doi:10.1080/15421400902939041

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…The acid-treated ITO gives a high work function due to the presence of interesting effect of the protons in the adsorbed acid layer. The effects of aquaregia (HNO 3 , HCl, distilled-water 1:3:20) and RCA (company name, NH 4 OH, H 2 O 2 , distilled-water 1:4:20) cleaning treatments of ITO surface on OLED performances have also been investigated [119]. The construction of OLED device was ITO/NPB/Alq 3 /LiF/Al.…”

Section: Chemical Treatmentsmentioning

confidence: 99%

Progress in Modification of Indium-Tin Oxide/Organic Interfaces for Organic Light-Emitting Diodes

2013

Critical Reviews in Solid State and Materials Sciences

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The oxide/organic interfaces play crucial roles in the hole injection from the anode electrodes to the emitting organics in organic light-emitting diodes (OLEDs), and hence have strong impacts on the efficiencies and other properties of the devices. Indium-tin oxide (ITO) is currently the most popular anode material used in OLEDs due to several merits, such as good etch ability, good adherence, high transparency, low resistivity, and high work function. Interfacial engineering between the ITO electrode and the overlying organic layers is an important process to obtain the high performance of the diode devices. In this article, recent progress in modification of the ITO/organic interfaces is reviewed, as these interfaces are important to the development of the technologies aiming at improving the electroluminescence, and efficiencies as well as reducing the operation voltages of OLEDs. ITO/Organic interfacial properties can be controlled or modified by simply changing the surface properties of ITO using chemical or physical treatments, and by adding a buffer layer (e.g., metal, oxide, or organic thin films) between the ITO and hole transport or emitting organic layers. The literature data showed that the electroluminescence, efficiencies, and lifetimes of the OLEDs could be greatly increased and the operation voltage considerably decreased when the ITO/organic interfaces have been properly improved.

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Section: Chemical Treatmentsmentioning

confidence: 99%

Progress in Modification of Indium-Tin Oxide/Organic Interfaces for Organic Light-Emitting Diodes

2013

Critical Reviews in Solid State and Materials Sciences

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“…To enhance the self-assembly density of F 5 BnPA, the ITO substrate was preactivated by NaOH-isopropanol solution and oxygen plasma cleaner. − Related results (Table S1 and Figure S1) and discussions were supplied in Supporting Information. Herein, ethanol (EtOH), toluene (PhMe), and butyl acetate (BA) were selected as the solvent for the self-assembly process.…”

mentioning

confidence: 99%

Modification of ITO with Composite Self-Assembled Monolayer Enables Hole Injection and Transport Layer-Free TADF-OLED with Preferable Performance

Han

Liu

Wang

et al. 2023

ACS Materials Lett.

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A complex multilayer device structure severely obstructs the commercial development of thermally activated delayed fluorescence material-based organic light-emitting diodes (TADF-OLEDs) due to high preparation costs. Herein, simplified TADF-OLED without both hole injection layer (HIL) and hole transport layer (HTL) was obtained by embellishing indium tin oxide (ITO) with a composite self-assembled monolayer modification strategy. Perfluorobenzyl phosphoric acid with perfluoroalkyl carboxylic acids formed a denser composite monolayer on the surface of ITO. This increases the work function of ITO, improves the quality of emitting layer film, and facilitates hole injection, which realized direct hole injection without the HIL and HTL. The resultant HIL/HTL-free TADF-OLED gains favorable luminescence performance including a current efficiency (CE) of 76.9 cd A −1 and an external quantum efficiency (EQE) of 22.0% for green TADF-OLED and a CE of 21.4 cd A −1 and EQE of 13.4% for blue TADF-OLED. This work provides an effective method in simplifying TADF-OLED structures for its further commercial application.

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One-dimensional straight-stripe-electrode tunable self-focusing cylindrical liquid crystal lens to realize the achromatic function in time domain

Shen

Jiao

Shen

et al. 2022

Optik

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Efficiency Improvement of OLED by Aquaregia and RCA Treatment of ITO Substrate

Cited by 10 publications

References 9 publications

Progress in Modification of Indium-Tin Oxide/Organic Interfaces for Organic Light-Emitting Diodes

Progress in Modification of Indium-Tin Oxide/Organic Interfaces for Organic Light-Emitting Diodes

Modification of ITO with Composite Self-Assembled Monolayer Enables Hole Injection and Transport Layer-Free TADF-OLED with Preferable Performance

One-dimensional straight-stripe-electrode tunable self-focusing cylindrical liquid crystal lens to realize the achromatic function in time domain

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