Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Jiang, Zhen; Zhong, Zhou; Xue, Shanfeng; Zhou, Yan; Meng, Yingchao; Hu, Zhanhao; Ai, Na; Wang, Jianbin; Wang, Lei; Peng, Junbiao; Ma, Yan; Pei, Jian; Wang, Jian; Cao, Yong

doi:10.1021/am501207g

Cited by 37 publications

(17 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our early contribution, we demonstrated that in an all fluorescent white OLED and a blue-emitting polymer lightemitting diodes (PLED) 10,11 , replacing high-conductive 4083 with low-conductive 8000 increases the maximum luminous efficiency. Since low-conductive PEDOT 8000 was used as hole inject layer here.…”

Section: Fabrication Of Pledsmentioning

confidence: 99%

P‐224L: Late‐News Poster: Inkjet‐printed Hyperbranched Polymer and Temperature Control of the Dewetting Phenomenon

Wang¹,

Mu²,

Song³

et al. 2017

Symp Digest of Tech Papers

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Fabrication Of Pledsmentioning

confidence: 99%

P‐224L: Late‐News Poster: Inkjet‐printed Hyperbranched Polymer and Temperature Control of the Dewetting Phenomenon

Wang¹,

Mu²,

Song³

et al. 2017

Symp Digest of Tech Papers

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the most part, efficient solution-processed OLEDs show inferior performance to their vacuum-evaporated analogs. [4][5][6][7][8] This is because solution-processed devices are generally characterised by disordered and non-uniform thin films, which impact negatively on the electronic as well as the optical properties of OLEDs. Therefore, materials that can spontaneously assemble into ordered arrangements that form uniform films are needed to improve the performance of solution-processed OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Molecular Design Strategy for a Two-Component Gel Based on a Thermally Activated Delayed Fluorescence Emitter

Rajamalli

Martir

Zysman‐Colman

2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Luminescent materials that can spontaneously assemble into highly ordered networks are essential to improve the quality of thin films in stacked device architectures and enhance the performances of solution processed OLEDs. Herein, we report two pyridine-decorated thermally activated delayed fluorescence (TADF) emitters, 3PyCzBP and 4PyCzBP. 4PyCzBP shows robust two component gel formation in the presence of either tartaric acid or succinic acid along with significant emission enhancement. Morphology studies reveal that these gels consist of homogeneous nanofibers assembled in hierarchical supramolecular networks. Transient photoluminescence spectra confirm that the gels emit via a TADF mechanism, making them the first examples of TADF gels. These nanofibers are promising candidates as self-assembled emitting nanofibers in thin films in solution-processed OLEDs.

show abstract

“…6 Both inorganic materials, such as alkali-metal salts and metal oxides, and organic materials, such as organic surfactants, have been successfully applied in devices. [7][8][9][10][11][12] Through the formation of a dipole layer at the organic/metal interface, induced by the interfacial interaction, the interfacial energy-level alignment is modified, leading to a reduction in the charge injection barrier. 1, 13 Various molecular structures are being examined to find the best modification materials for different devices.…”

Section: Introductionmentioning

confidence: 99%

Dipole formation at organic/metal interfaces with pre-deposited and post-deposited metal

Zhong

Zhang

et al. 2017

NPG Asia Mater

Self Cite

View full text Add to dashboard Cite

In organic electronic devices, the interfacial dipole at organic/metal interfaces is critical in determining the carrier injection or extraction that limits the performance of the device. A novel technique to enable the direct measurement of underburied dipoles is developed and demonstrated. By tilting the shadow mask by a small angle, metal atoms diffuse into the opening slit to form an ultrathin metal layer during the evaporation process. As the ultrathin metal layer cannot screen out the dipole-induced surface work function change, the dipole strength and direction at the organic/metal interface can be revealed. It was found that the polarity of the organic material, the Fermi-level pinning and the interface morphology all play important roles in dipole formation. By comparing the energy level shifts at the organic/pre-deposited metal and organic/post-deposited metal interfaces, the dipole formed by molecular interactions could be distinguished from the dipole formed by Fermi-level pinning. NPG Asia Materials (2017) 9, e379; doi:10.1038/am.2017.56; published online 19 May 2017 INTRODUCTIONIn organic electronic devices, such as organic solar cells and organic light-emitting diodes, energy-level alignment at the organic/metal interface is critical for device performance because it determines the carrier injection barrier and device built-in voltage. 1,2 A small energylevel offset between the organic material's charge transport level and the metal's Fermi level is always favored to form an ohmic contact at the interface. Therefore, metals with low work function (WF), such as Ba, Ca, Li, Cs and Al, are popular choices for cathodes to facilitate electron injection or extraction. 3-5 However, low WF metals are intrinsically unstable. As a consequence, much effort has been made to develop electrode modification materials to enable the use of stable but high WF metals as cathodes. 6 Both inorganic materials, such as alkali-metal salts and metal oxides, and organic materials, such as organic surfactants, have been successfully applied in devices. [7][8][9][10][11][12] Through the formation of a dipole layer at the organic/metal interface, induced by the interfacial interaction, the interfacial energy-level alignment is modified, leading to a reduction in the charge injection barrier. 1,13 Various molecular structures are being examined to find the best modification materials for different devices.To select the desired interfacial material, the most common characterization is measuring the WF change on substrates of the cathode metal before and after depositing the interfacial materials on top 14,15 (Figure 1a). A reduced WF indicates that the electron injection barrier is lowered and hence can be used at the cathode. In contrast, an increased WF implies that the material can be used to enhance hole injection at the anode. The deduction is straightforward for inverted devices for which the layer deposition sequence, that is, cathode

show abstract

Highly Efficient, Solution Processed Electrofluorescent Small Molecule White Organic Light-Emitting Diodes with a Hybrid Electron Injection Layer

Cited by 37 publications

References 49 publications

P‐224L: Late‐News Poster: Inkjet‐printed Hyperbranched Polymer and Temperature Control of the Dewetting Phenomenon

P‐224L: Late‐News Poster: Inkjet‐printed Hyperbranched Polymer and Temperature Control of the Dewetting Phenomenon

Molecular Design Strategy for a Two-Component Gel Based on a Thermally Activated Delayed Fluorescence Emitter

Dipole formation at organic/metal interfaces with pre-deposited and post-deposited metal

Contact Info

Product

Resources

About