Achieving above 30% external quantum efficiency for inverted phosphorescence organic light-emitting diodes based on ultrathin emitting layer

Li, Jun; Shi, Xindong; Wu, Xinkai; Wang, Jing; Min, Zhiyuan; Wang, Yang; Yang, Meijun; Chen, Chin H.; He, Gufeng

doi:10.1016/j.orgel.2014.07.027

Cited by 42 publications

(28 citation statements)

References 20 publications

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“…These devices were named as device W1 for the incorporation with red/ yellow/green sequence, device W2 for the incorporation with green/yellow/red sequence, device W3 for the incorporation with green/red/yellow sequence, and device W4 for the incorporation with yellow/red/green sequence. The detailed device structures are listed below: Here, ultrathin sheets of phosphors with a thickness of <0.1 nm do not form a neat layer but partially penetrate into the adjacent Bepp 2 [33,34]; hence, they serve as dopants in adjacent Bepp 2 . In addition, in these white devices, different-color ultrathin phosphorescence layers are incorporated away from HTL/EML and EML/ETL interfaces for 3 nm, and they are also separated by a 2 nm-thick Bepp 2 layer.…”

Section: Proposed Woleds and The Basic Principlementioning

confidence: 99%

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

et al. 2017

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By incorporating ultrathin (<0.1 nm) green, yellow, and red phosphorescence layers with different sequence arrangements in a blue fluorescence layer, four unique and simplified fluorescence/phosphorescence (F/P) hybrid, white organic light-emitting diodes (WOLEDs) were obtained. All four devices realize good warm white light emission, with high color rending index (CRI) of >80, low correlated color temperature of <3600 K, and high color stability at a wide voltage range of 5 V-9 V. These hybrid WOLEDs also reveal high forward-viewing external quantum efficiencies (EQE) of 17.82%-19.34%, which are close to the theoretical value of 20%, indicating an almost complete exciton harvesting. In addition, the electroluminescence spectra of the hybrid WOLEDs can be easily improved by only changing the incorporating sequence of the ultrathin phosphorescence layers without device efficiency loss. For example, the hybrid WOLED with an incorporation sequence of ultrathin red/yellow/ green phosphorescence layers exhibits an ultra-high CRI of 96 and a high EQE of 19.34%. To the best of our knowledge, this is the first WOLED with good tradeoff among device efficiency, CRI, and color stability. The introduction of ultrathin (<0.1 nm) phosphorescence layers can also greatly reduce the consumption of phosphorescent emitters as well as simplify device structures and fabrication process, thus leading to low cost. Such a finding is very meaningful for the potential commercialization of hybrid WOLEDs.

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Section: Proposed Woleds and The Basic Principlementioning

confidence: 99%

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

et al. 2017

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“…2(a)), the approximate exciton distribution inside the mCP layer was obtained. As proved in previous research, molecules of the interlayer are not in the form of a neat layer but partially penetrate into the host material when the interlayer is as thin as 0.5 nm [10]. Therefore, we assumed that the influence of this extremely thin probe layer on the overall distribution of excitons is insignificant.…”

Section: Resultsmentioning

confidence: 91%

“…Zhao et al explored this novel concept and found that the non-doped, EML-based OLED structure might possibly be widely applied to many phosphorescent dopants [9]. Further, high-efficiency mono-color OLEDs that incorporate ultra-thin, non-doped EMLs have been demonstrated [10]. Such OLEDs have many merits, such easy optimization and host independence [9].…”

Section: Introductionmentioning

confidence: 99%

Balanced white organic light-emitting diode with non-doped ultra-thin emissive layers based on exciton management

Tan

Ouyang

Xie

et al. 2015

Organic Electronics

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“…In the last decades, high-performance flexible organic semiconductor devices have been continually pursued by scientific communities [16,37−48]. For example, OLEDs with external quantum efficiency (EQE) of >30% for blue [1][2][3][4] and green [5][6][7][8][9] emitting devices, and>20% for red [49] emitting devices, OSCs [10,11] and organic-inorganic hybrid perovskite solar cells [12] with power current efficiency (PCE) of >10% and 20%, respectively, OFETs with mobility of several tens cm 2 V −1 s −1 [13,14] and OMDs with high densities, high on/off ratios, fast response and long durability [15][16][17][18] have been reported.…”

Section: Development From Flexible To Ultraflexible Organic Semicondumentioning

confidence: 99%

“…The active semiconductors can be organic channel materials for OFETs, organic light-emitting materials for OLEDs, organic photoactive materials for OSCs, organic memory materials for OMDs. To date, great improvements have been made for achieving high performance that is comparable to their inorganic counterparts [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thin-film organic semiconductor devices: from flexibility to ultraflexibility

Qian

Zhang

et al. 2016

Sci. China Mater.

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Flexible thin-film organic semiconductor devices have received wide attention due to favorable properties such as light-weight, flexibility, reproducible semiconductor resources, easy tuning of functional properties via molecular tailoring, and low cost large-area solution-procession. Among them, ultraflexible electronics, usually with minimum bending radius of less than 1 mm, are essential for the development of epidermal and bio-implanted electronics, wearable electronics, collapsible and portable electronics, three dimensional (3D) surface compliable electronics, and bionics. This review firstly gives a brief introduction of development from flexible to ultraflexible organic semiconductor electronics, and design of ultraflexible devices, then summarizes the recent advances in ultraflexible thin-film organic semiconductor devices, focusing on organic field effect transistors, organic light-emitting diodes, organic solar cells and organic memory devices.

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Achieving above 30% external quantum efficiency for inverted phosphorescence organic light-emitting diodes based on ultrathin emitting layer

Cited by 42 publications

References 20 publications

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

Balanced white organic light-emitting diode with non-doped ultra-thin emissive layers based on exciton management

Thin-film organic semiconductor devices: from flexibility to ultraflexibility

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