A highly efficient, transparent and stable charge generation unit based on a p-doped monolayer

Liu, Jun; Wang, Jing; Huang, Saijun; Shi, Xindong; Wu, Xinkai; He, Gufeng

doi:10.1016/j.orgel.2013.02.035

Cited by 21 publications

(11 citation statements)

References 25 publications

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“…For down-conversation WOLEDs ( Figure 3 e), the main issue is how to develop an efficient blue OLED, since the down-conversation layer only can be excited by absorbing the blue emission [ 106 , 107 , 108 , 109 ]. For tandem WOLEDs ( Figure 3 f), the main focus is how to design an effective charge generation layer (CGL), since the CGL plays a significant role in ensuring high efficiency and long lifetime [ 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ]. Based on these facts, we would like to only briefly introduce these structures in this review.…”

Section: Fluorescent Woledsmentioning

confidence: 99%

Strategies to Achieve High-Performance White Organic Light-Emitting Diodes

Zhang

Luo

et al. 2017

Materials

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As one of the most promising technologies for next-generation lighting and displays, white organic light-emitting diodes (WOLEDs) have received enormous worldwide interest due to their outstanding properties, including high efficiency, bright luminance, wide viewing angle, fast switching, lower power consumption, ultralight and ultrathin characteristics, and flexibility. In this invited review, the main parameters which are used to characterize the performance of WOLEDs are introduced. Subsequently, the state-of-the-art strategies to achieve high-performance WOLEDs in recent years are summarized. Specifically, the manipulation of charges and excitons distribution in the four types of WOLEDs (fluorescent WOLEDs, phosphorescent WOLEDs, thermally activated delayed fluorescent WOLEDs, and fluorescent/phosphorescent hybrid WOLEDs) are comprehensively highlighted. Moreover, doping-free WOLEDs are described. Finally, issues and ways to further enhance the performance of WOLEDs are briefly clarified.

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Section: Fluorescent Woledsmentioning

confidence: 99%

Strategies to Achieve High-Performance White Organic Light-Emitting Diodes

Zhang

Luo

et al. 2017

Materials

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“…The CGLs of tandem OLEDs play an important role in achieving a low operating voltage and a high current efficiency due to the charges generated in the CGL. The CGL of tandem OLEDs has been typically fabricated utilizing a heterojunction structure containing an n-type-dopant-doped electron transport layer (ETL) and a p-type-dopant-doped layer, resulting in a supply of electrons and holes, respectively, to the adjacent layers of the CGL [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement in tandem organic light-emitting devices with a hybrid charge generation layer composed of BEDT-TTF-doped TPBi/mCP/HAT-CN

Kim

2014

Organic Electronics

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“…In tandem OLEDs, several individual electroluminescent (EL) units are electrically connected in series via connecting stacks (sometime referred to as connecting electrodes) which function as charge generation layer (CGL), where holes and electrons are generated and injected into the adjacent hole transporting layers (HTL) and electron transporting layers (ETL), respectively. In principle, the device characteristics such as voltage, luminance, and current efficiency scale linearly with the number of EL units for tandem device with an efficient CGL 8 9 10 11 12 13 14 15 16 17 .…”

mentioning

confidence: 99%

“…For instance, the combination of the transition metal oxide (TMO) such as molybdenum trioxide (MoO 3 ) and HTL is widely used as p-type layers due to the very low conduction band minimum (CBM) and the high work function 10 11 12 13 14 15 18 . As for n-type CGL materials, an ultrathin bilayer Liq/Al is used as an electron extraction layer 8 16 17 18 . For a typical organic/metal/metal oxides electrode system, TMO serves as a strong electron acceptor, when electrons are drawn from the highest occupied molecular orbital (HOMO) of HTL to the CBM of TMO, and thus electron-hole pairs are generated.…”

mentioning

confidence: 99%

Stacking multiple connecting functional materials in tandem organic light-emitting diodes

Zhang

Wang

Jiang

et al. 2017

Sci Rep

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Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge generation and charge injection. For a tandem organic light-emitting diode (OLED) with a simple Liq/Al/MoO3 stack, we discovered that there is a significant current lateral spreading causing light emission over an extremely large area outside the OLED pixel when the Al thickness exceeds 2 nm. This spread light emission, caused by an inductive electric field over one of the device unit, limits one’s ability to fabricate high performance tandem devices. To resolve this issue, a new connecting materials stack with a C60 fullerene buffer layer is reported. This new structure permits optimization of the Al metal layer in the connecting stack and thus enables us to fabricate an efficient tandem OLED having a high 155.6 cd/A current efficiency and a low roll-off (or droop) in current efficiency.

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A highly efficient, transparent and stable charge generation unit based on a p-doped monolayer

Cited by 21 publications

References 25 publications

Strategies to Achieve High-Performance White Organic Light-Emitting Diodes

Strategies to Achieve High-Performance White Organic Light-Emitting Diodes

Efficiency enhancement in tandem organic light-emitting devices with a hybrid charge generation layer composed of BEDT-TTF-doped TPBi/mCP/HAT-CN

Stacking multiple connecting functional materials in tandem organic light-emitting diodes

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