Improved efficiency of blue phosphorescence organic light‐emitting diodes with irregular stepwise‐doping emitting layers

Li, Jun; Wang, Jing; Huang, Saijun; Chen, Hsi-An; He, Gufeng

doi:10.1002/pssa.201228727

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Tandem organic light-emitting diodes (OLEDs) have attracted wide attention for the development of next-generation flat-panel displays and solid-state lighting due to their excellent properties, such as higher luminance, lower power consumption, and longer lifetime, as compared to the conventional OLEDs. − In a tandem OLED, several individual electroluminescent (EL) units are connected vertically in series via charge generation unit (CGU), where holes and electrons generate and inject into the adjacent hole- and electron-transporting layers (HTL and ETL) of the individual EL units under the applied electrical field. Therefore, efficient charge generation and separation processes within CGU are crucial for tandem OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Charge Separation Process in an Ultrathin Electron-Injecting Bilayer-Assisted Charge Generation Unit for Tandem Organic Light-Emitting Diodes

et al. 2013

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We have systematically investigated charge separation process in an ultrathin electron-injecting bilayer-assisted charge generation unit (CGU) consisting of n-type/p-type junction for tandem organic light-emitting diode (OLED). Charge generation occurs in the p-type side, which is formed by doping a strong electron acceptor in an electron-rich organic semiconductor (OSC). The n-type side is an ultrathin bilayer that acts as electron-injecting layer (EIL) for assisting electron separation from the p-type doped OSC. The energy barrier for electron tunneling is significantly reduced by means of increasing the evaporation rate of Al in the bilayer and acceptor concentration in OSC. Moreover, insertion of an interlayer with a deep-lying lowest unoccupied molecular orbital (LUMO) level between the n-type and p-type materials induces a tunneling path with low barrier, which is further proved by current density–voltage (J–V) and capacitance–voltage (C–V) characteristics of external carrier-excluding devices. Tandem OLED with CGU including the interlayer exhibits better performances such as lower driving voltage and higher power efficiency, demonstrating that the interlayer with deep-lying LUMO plays an important role in promotion of charge separation process.

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Section: Introductionmentioning

confidence: 99%

Charge Separation Process in an Ultrathin Electron-Injecting Bilayer-Assisted Charge Generation Unit for Tandem Organic Light-Emitting Diodes

et al. 2013

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Study on hybrid blue organic light emitting diodes with step controlled doping profiles in phosphorescent emitting layer

et al. 2018

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Efficient Green Organic Light-Emitting Devices Based on a Solution-Processable Starburst Molecule

Zhang

Wang

Zhao

et al. 2013

Chinese Phys. Lett.

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We develop high efficiency solution-processed pure green organic light-emitting devices using a starburst molecule 7,7 ',7"-(5,5,10,10,15,15-hexahexyl-10, 15-as the emitting layers. The electroluminescence properties of the devices with different doping concentrations are investigated. With the increasing doping concentration from 0.5wt% to 5wt%, the maximum efficiency changes from 4.8 cd/A to 8.4 cd/A. Under the optimal concentration of 4wt%, the device shows pure green emission at 516 nm with a chromaticity coordinate of (0.30, 0.59) as well as a high brightness of 19900 cd/m 2 and a high efficiency of 10.1 cd/A, which are better than 11490 cd/m 2 and 4.2 cd/A obtained in the undoped device.

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Improved efficiency of blue phosphorescence organic light‐emitting diodes with irregular stepwise‐doping emitting layers

Cited by 3 publications

References 24 publications

Charge Separation Process in an Ultrathin Electron-Injecting Bilayer-Assisted Charge Generation Unit for Tandem Organic Light-Emitting Diodes

Charge Separation Process in an Ultrathin Electron-Injecting Bilayer-Assisted Charge Generation Unit for Tandem Organic Light-Emitting Diodes

Study on hybrid blue organic light emitting diodes with step controlled doping profiles in phosphorescent emitting layer

Efficient Green Organic Light-Emitting Devices Based on a Solution-Processable Starburst Molecule

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