High Efficiency Red Phosphorescent Organic Light-Emitting Diodes with Simple Structure

Kwon, Jang Hyuk; Pode, Ramchandra

doi:10.5772/18521

Cited by 8 publications

(7 citation statements)

References 97 publications

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“…This was not the case at room temperature in which the linkage effects were more important for the IDT series (18 nm shift from meta to para) than for the IF series (no shift). As main red phosphorescent dyes possess ET around 2.0 eV, [75] both paraand meta-DSF-IDT should be adapted to host red phosphorescent dyes, this will be performed in due course.…”

Section: Optical Propertiesmentioning

confidence: 99%

Modulating the Physical and Electronic Properties over Positional Isomerism: The Dispirofluorene–Dihydroindacenodithiophene (DSF‐IDT) Family

Peltier

Heinrich

Donnio

et al. 2017

Chemistry A European J

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We report the first studies on the intrinsic properties of a meta-substituted dihydroindacenodithienyl fragment and more generally the strong impact of positional isomerism on dihydroindacenodithiophene derivatives. The influence of the para and meta linkages has notably been highlighted not only for the electronic properties in solution (electrochemical properties, anodic polymerization, HOMO/LUMO energy levels, optical transitions, fluorescence spectra) but also on the physical properties in the solid state (molecular organization, crystallinity, and phase transitions). The positional isomerism hence appears to be a very efficient tool to drastically tune the properties of dihydroindacenodithiophene derivatives.

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Section: Optical Propertiesmentioning

confidence: 99%

Modulating the Physical and Electronic Properties over Positional Isomerism: The Dispirofluorene–Dihydroindacenodithiophene (DSF‐IDT) Family

Peltier

Heinrich

Donnio

et al. 2017

Chemistry A European J

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show abstract

“…In addition, these layers reduce the energy difference between the valence and conduction bands of the adjacent layers (e.g., HIL), which serves to improve the charge injection, reducing nonradiative recombination. 14 The substrate can be rigid (e.g., glass) or flexible (e.g., polyethylene terephthalate, PET). Flexible substrates are used for continuous roll-to-roll manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Engineering of Flexible and Large-Area Red Organic-Light-Emitting Diodes Based on an N-Annulated Perylene Diimide Dimer

Rahmati

Dayneko

Pahlevani

et al. 2019

ACS Appl. Electron. Mater.

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Flexible red OLEDs based on a quadruple-layer stack, in between electrodes, with 160 mm 2 active area were fabricated in ambient air on PET via slotdie-coating. For the OLED structure PET/ITO/PEDOT:PSS/PVK/PFO:tPDI 2 N-EH/ZnO/Ag, the ink formulations and coating parameters for each layer were systematically evaluated and optimized. The air-stable red-light-emitting material tPDI 2 N-EH was successfully utilized as blended homogeneous film with PFO for the emitting layer. The use of an organic hole-transport layer (PVK) and inorganic electron injection layer (ZnO) significantly improved the brightness of the reference device from 4 to 303 cd/m 2 . Surface analysis using AFM measurements showed that the PVK interlayer reduced the surface roughness of the hole injection layer (PEDOT:PSS) from 0.45 to 0.17 nm, which improved the ability to form uniform emitting layers on top. In addition, the ZnO interlayer decreased surface roughness from 1.26 to 0.85 nm and reduced the turn-on voltage of the device from 5.0 to 2.8 V.

show abstract

“…In addition, these layers reduce the energy difference between the valence and conduction bands of the adjacent layers (e.g. HIL), which serves to improve the charge injection, reducing non-radiative recombination 14 . The substrate can be rigid (e.g.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Engineering of Flexible and Large Area Red Organic Light Emitting Diodes Based on a N-Annulated Perylene Diimide Dimer

Rahmati¹,

Pahlevani²,

Welch³

2019

Preprint

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Flexible red OLEDs based on a quadruple layer stack in-between electrodes with 160 mm2 active area were fabricated in ambient air on PET via slot-die coating. For the OLED structure PET/ITO/PEDOT:PSS/PVK/PFO:tPDI2N-EH/ZnO/Ag the ink formulations and coating parameters for each layer were systematically evaluated and optimized. The air-stable red-light emitting material tPDI2N-EH was successfully utilized as blended homogeneous film with PFO for the emitting layer. The use of an organic hole-transport layer (PVK) and inorganic electron injection layer (ZnO) significantly improved the brightness of the reference device from 4 cd/m2 to 303 cd/m2. Surface analysis using AFM measurements showed that PVK interlayer reduced the surface roughness of the hole injection layer (PEDT:PSS) from 0.45 nm to 0.17 nm, which improved the ability to form uniform emitting layers on top. In addition, the ZnO interlayer improved the average roughness of the device from 1.26 nm to 0.85 nm and reduced the turn-on voltage of the device from 5.0 V to 2.8 V.

show abstract

High Efficiency Red Phosphorescent Organic Light-Emitting Diodes with Simple Structure

Cited by 8 publications

References 97 publications

Modulating the Physical and Electronic Properties over Positional Isomerism: The Dispirofluorene–Dihydroindacenodithiophene (DSF‐IDT) Family

Modulating the Physical and Electronic Properties over Positional Isomerism: The Dispirofluorene–Dihydroindacenodithiophene (DSF‐IDT) Family

Interlayer Engineering of Flexible and Large-Area Red Organic-Light-Emitting Diodes Based on an N-Annulated Perylene Diimide Dimer

Interlayer Engineering of Flexible and Large Area Red Organic Light Emitting Diodes Based on a N-Annulated Perylene Diimide Dimer

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