Molybdenum oxide anode buffer layers for solution processed, blue phosphorescent small molecule organic light emitting diodes

Höfle, Stefan; Do, Hung; Mankel, Eric; Pfaff, Marina; Zhang, Zhenhao; Bahro, Daniel; Mayer, Thomas; Jaegermann, Wolfram; Gerthsen, D.; Feldmann, Claus; Lemmer, Uli; Colsmann, Alexander

doi:10.1016/j.orgel.2013.04.017

Cited by 48 publications

(27 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By utilizing the s- 35 MoO x -treated AgNW TCE as the anode in ITO-free OLEDs, promising performance results of 29.2 lm/W and 10.3% E.Q.E. The solution-processed s-MoO x -treated AgNW TCEs exhibit a combination of several promising characteristics, such 30 as high and broad transmittance across a wavelength range of 400 to 1000 nm, total transmission of up to 95.9%, low R sheet of 29.8 ohm/sq, low haze value of 0.90%, better adhesion on the substrate, good flexibility, and preferable gap states for efficient hole injection in optoelectronic applications.…”

Section: Discussionmentioning

confidence: 99%

“…The s-MoO x -treated AgNW TCE was also subjected to an adhesion test using 3M Scotch tape. In contrast, the MoO x films prepared in the oxygen-deficient environment (e- 35 MoO x and s-MoO x annealed in N 2 ) contain atoms in Mo 6+ , Mo 5+ , and Mo 4+ oxidation states. The results show that the pristine AgNW TCE can be easily peeled off and thus has poor 15 mechanical adhesion to the substrate.…”

Section: Forward Scattered Light Haze Valuementioning

confidence: 99%

“…All three of these samples have haze values that are lower than the haze value normally required for various critical applications (1%). However, the s-MoO x -treated samples show that with effective linking of nanowire junctions, excellent low resistance of less than 30 ohm/sq and a low haze value of 0.90% is still feasible in a 35 AgNW-based TCE. A low-density AgNW matrix usually 30 exhibits high R sheet , such as in the case of the pristine AgNW TCE shown here (R sheet = 4411 ohm/sq, Table 1).…”

Section: Forward Scattered Light Haze Valuementioning

confidence: 99%

“…To investigate the optical properties of MoO x -treated AgNW 35 TCEs, a UV-Vis spectrometer with an integrating sphere was used to measure the total transmittance (T), total reflectance (R), and diffuse transmission of the samples. The results are shown in Figure 4 and the key parameters are summarized in Table 1 which normally shows a FoM value of ~ 240.…”

Section: Tce and Oled Characteristics Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

A solution-processed molybdenum oxide treated silver nanowire network: a highly conductive transparent conducting electrode with superior mechanical and hole injection properties

et al. 2015

View full text Add to dashboard Cite

We demonstrate the fabrication of solution-processed MoOx-treated (s-MoOx) silver nanowire (AgNW) transparent conductive electrodes (TCEs) utilizing low-temperature (sub-100 °C) processes. The s-MoOx aggregates around the AgNW and forms gauze-like MoOx thin films between the mesh, which can effectively lower the sheet resistance by more than two orders of magnitude. Notably, these s-MoOx-treated AgNW TCEs exhibit a combination of several promising characteristics, such as a high and broad transmittance across a wavelength range of 400 to 1000 nm, transmission of up to 96.8%, a low sheet resistance of 29.8 ohm sq(-1), a low haze value of 0.90%, better mechanical properties against bending and adhesion tests, and preferable gap states for efficient hole injection in optoelectronic applications. By utilizing these s-MoOx-treated AgNW TCEs as the anode in ITO-free organic light emitting diodes, promising performance of 29.2 lm W(-1) and 10.3% external quantum efficiency are demonstrated. The versatile, multi-functional s-MoOx treatment presented here paves the way for the use of low-temperature, solution-processed MoOx as both a nanowire linker and a hole injection interfacial layer for future flexible optoelectronic devices.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Forward Scattered Light Haze Valuementioning

confidence: 99%

Section: Forward Scattered Light Haze Valuementioning

confidence: 99%

Section: Tce and Oled Characteristics Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

A solution-processed molybdenum oxide treated silver nanowire network: a highly conductive transparent conducting electrode with superior mechanical and hole injection properties

et al. 2015

View full text Add to dashboard Cite

show abstract

“…[70][71][72][73] When they are in contact with ITO, there is a strong vacuum level shift resulting in the formation of an interface dipole at the ITO interface and reduction in hole injection barriers. 74 Similarly, Jian et al 75 MoO 3 .…”

Section: Methodsmentioning

confidence: 97%

Review of recent progress in multilayer solution-processed organic light-emitting diodes

et al. 2015

View full text Add to dashboard Cite

Organic light-emitting diodes (OLEDs) have become a promising candidate for lighting and display applications. High efficiency OLEDs require a multilayer device architecture to provide exciton confinement and balance charge transport. Conventional OLEDs are made by vacuum process, and the manufacturing cost can be reduced by solution processing. However, unlike vacuum-deposited OLEDs, solution-processed multilayer OLEDs are more challenging to make. The key for multilayer solution processing is to have the layer structure which can withstand solvents used in subsequent processing. We review the materials' strategies to make multilayer solution-processed OLEDs. Specifically, we will discuss the use of cross-linkable organic materials, metal oxides, and orthogonal solvent systems to deposit various functional layers in an OLED. Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-2 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-3 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-4 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-5 Vol. 5, 2015 Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-6 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-7 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-8 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multilayer solution-processed organic light-emitting diodes Journal of Photonics for Energy 057611-9 Vol. 5, 2015 Downloaded From: http://photonicsforenergy.spiedigitallibrary.org/ on 06/04/2015 Terms of Use: http://spiedl.org/terms Ho et al.: Review of recent progress in multil...

show abstract

The Root Causes of the Limited Stability of Solution‐Coated Small‐Molecule Organic Light‐Emitting Devices: Faster Host Aggregation by Exciton–Polaron Interactions

Cho

Zhang

et al. 2016

Adv Funct Materials

View full text Add to dashboard Cite

The degradation mechanism is compared in organic light-emitting devices (OLEDs) fabricated by solution-coating to that in vacuum-deposited OLEDs. Devices comprising various host materials made by vacuum-deposition or solution-coating are investigated. Changes in devices electroluminescence (EL) spectra during prolonged electrical driving are compared and analyzed. Hole-only devices are also utilized, and employed to study the effects of charges and excitons, separately and combined. The results reveal that the faster degradation of solution-processed devices relative to their vacuumdeposited counterparts under electrical stress is due to a faster aggregation of the host materials. Interactions between excitons and polarons in the emitting layers of the devices induce this aggregation phenomenon. Although this phenomenon affects both vacuum-deposited and solution-coated emitting layers, it is found to occur much faster in the later. The findings shed light on the root causes of the limited stability of solution-processed OLEDs.

show abstract

Molybdenum oxide anode buffer layers for solution processed, blue phosphorescent small molecule organic light emitting diodes

Cited by 48 publications

References 25 publications

A solution-processed molybdenum oxide treated silver nanowire network: a highly conductive transparent conducting electrode with superior mechanical and hole injection properties

A solution-processed molybdenum oxide treated silver nanowire network: a highly conductive transparent conducting electrode with superior mechanical and hole injection properties

Review of recent progress in multilayer solution-processed organic light-emitting diodes

The Root Causes of the Limited Stability of Solution‐Coated Small‐Molecule Organic Light‐Emitting Devices: Faster Host Aggregation by Exciton–Polaron Interactions

Contact Info

Product

Resources

About