Simultaneous achievement of low efficiency roll-off and stable color in highly efficient single-emitting-layer phosphorescent white organic light-emitting diodes

Liu, Baiquan; Wang, Lei; Xu, Miao; Xia, Xing-Heng; Zou, Jianhua; Su, Yueju; Gao, Deyun; Lan, Linfeng; Peng, Junbiao

doi:10.1039/c4tc00413b

Cited by 23 publications

(19 citation statements)

References 46 publications

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“…Apart from the general issues to guarantee high-performance WOLEDs (e.g., the manipulation of charge injection, transport and balance, the management of exciton generation, harvesting, recombination, diffusion and quenching, the regulation of host (guest)-to-guest mutual energy transfer, and the enhancement of light outcoupling efficiency.) [146][147][148][149][150][151][152][153][154][155][156], some additional attentions are needed to be paid on the exciplex-based WOLEDs. On one hand, when using as the emitter, exciplexes give a new broad emission peak that appears at a long wavelength compared to the intrinsic donor and acceptor, which is beneficial to develop high-quality WOLEDs.…”

Section: Basic Aspects Of Exciplex-based Woledsmentioning

confidence: 99%

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Xiao

Huang

et al. 2018

Applied Sciences

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Recently, exciplexes have been actively investigated in white organic light-emitting diodes (WOLEDs), since they can be effectively functioned as (i) fluorescent or thermally activated delayed fluorescent (TADF) emitters; (ii) the hosts of fluorescent, phosphorescent and TADF dopants. By virtue of the unique advantages of exciplexes, high-performance exciplex-based WOLEDs can be achieved. In this invited review, we have firstly described fundamental concepts of exciplexes and their use in organic light-emitting diodes (OLEDs). Then, we have concluded the primary strategies to develop exciplex-based WOLEDs. Specifically, we have emphasized the representative WOLEDs using exciplex emitters or hosts. In the end, we have given an outlook for the future development of exciplex-based WOLEDs.

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Section: Basic Aspects Of Exciplex-based Woledsmentioning

confidence: 99%

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Xiao

Huang

et al. 2018

Applied Sciences

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“…TADF emitters can be used to develop high-performance WOLEDs, because TADF emitters can (i) harness triplet excitons; (ii) exhibit excellent efficiency; (iii) show usually broad emission spectra with rather large full width at half-maximum of about 100 nm, which is wider than that of conventional fluorescent materials due to their charge-transfer nature [100][101][102]. For WOLEDs based on TADF, apart from the selection of excellent emitters, the careful manipulation of device engineering also plays a significant role in the performance [103][104][105][106]. Therefore, to attain the high performance, the design strategies, device structures, working mechanisms and electroluminescent processes of the WOLEDs based on TADF should be well manipulated [107][108][109].…”

Section: Basic Aspects Of Woleds Based On Tadfmentioning

confidence: 99%

Emergence of White Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence

Xiao

Dong²,

Xie

et al. 2018

Applied Sciences

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Recently, thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have attracted both academic and industrial interest due to their extraordinary characteristics, such as high efficiency, low driving voltage, bright luminance, lower power consumption and potentially long lifetime. In this invited review, the fundamental concepts of TADF have been firstly introduced. Then, main approaches to realize WOLEDs based on TADF have been summarized. More specifically, the recent development of WOLEDs based on all TADF emitters, WOLEDs based on TADF and conventional fluorescence emitters, hybrid WOLEDs based on blue TADF and phosphorescence emitters and WOLEDs based on TADF exciplex host and phosphorescence dopants is highlighted. In particular, design strategies, device structures, working mechanisms and electroluminescent processes of the representative WOLEDs based on TADF are reviewed. Finally, challenges and opportunities for further enhancement of the performance of WOLEDs based on TADF are presented.

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“…Since WOLEDs are usually composed of multiple emitters, the recombination zone will be changed when the voltage is altered, leading to the color shift. WOLEDs usually exhibit a blue-shifted color phenomenon with the voltage increasing because the blue emitters are excited by the higher energy at higher electric field [ 39 , 40 , 41 , 42 ]. Moreover, due to the different lifetime of each emitter in WOLEDs, the color stability can be affected with the operating time increasing (e.g., the lifetime of the blue phosphorescent emitter iridium(III) bis[(4,6-difluorophenyl)-pyridinato- N , C 2 ′] picolinate (FIrpic) is very short, <1 h) [ 11 ].…”

Section: Parameters To Characterize 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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Simultaneous achievement of low efficiency roll-off and stable color in highly efficient single-emitting-layer phosphorescent white organic light-emitting diodes

Abstract: Low efficiency roll-off, stable color and highly efficient single-EML phosphorescent WOLEDs are realized.

Cited by 23 publications

References 46 publications

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Emergence of White Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence

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

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