Color-stable, reduced efficiency roll-off hybrid white organic light emitting diodes with ultra high brightness

Liu, Baiquan; Su, Yueju; Gao, Deyun; Lan, Linfeng; Zou, Jianhua; Peng, Junbiao

doi:10.1088/1674-1056/22/7/077303

Cited by 34 publications

(27 citation statements)

References 27 publications

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“…As known, a balanced charge carrier in the EML would improve the efficiencies and reduce the efficiency roll-off. [14][15][16] As shown in Figure 7, we achieved a current efficiency (C.E.) of 56.2 cd/A, a power efficiency (P.E.)…”

Section: Chip Fabricationmentioning

confidence: 73%

High Performance Top‐Emitting Organic Light‐Emitting Diodes for Super Video Graphics Array Monochromatic Microdisplays Application

Zhang

Yue

et al. 2015

Chin. J. Chem.

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We have demonstrated a high performance top-emitting organic light-emitting diode (TEOLED) achieving a brightness of 1000 cd/m 2 at a low voltage of 3.4 V, a power efficiency of 55.2 lm/W at a brightness of 611 cd/m 2 , and a low efficiency roll-off 5.1% calculated from the maximum efficiency value to that of 5000 cd/m 2 . Such improved properties are controlled by electron injection from 7-diphenyl-1,10-phenanthroline (BPhen) into and transport by the 2,4,6-tris[3'-(pyridin-3-yl)biphenyl-3-yl]-1,3,5-triazine (TmPPPyTz) layer along with hole injection from 4,4',4''-tris(N-carbazolyl)diphenylamine (TcTa) directly into the fac-tris(2-phenylpyridine)iridium [Ir(ppy) 3 ] highest occupied molecular level (HOMO), leading to direct carrier recombination and excitons formation on the phosphor dopants. Eventually we integrated our high performance TEOLEDs on complementary metal oxide semiconductor (CMOS) substrates to realize super video graphics array (SVGA) OLED microdisplays.

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Section: Chip Fabricationmentioning

confidence: 73%

High Performance Top‐Emitting Organic Light‐Emitting Diodes for Super Video Graphics Array Monochromatic Microdisplays Application

Zhang

Yue

et al. 2015

Chin. J. Chem.

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“…As far as the efficiency is concerned, there is still a gap from the theoretical value of WOLEDs efficiency of 248 lm/W [168]. In the design of device structure, exciton distribution should be precisely regulated, and the appropriate energy-level matching between each layer [169][170][171] and optical coupling technology [172][173][174] could help to increase the efficiency of devices. Many previous reports have claimed with suffering severe efficiency roll-off, which may be related to charge bal- ance, interlayer barriers, and slower RISC rate of TADF materials [175][176][177][178][179][180][181][182].…”

Section: Discussionmentioning

confidence: 99%

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

Xue

Lin

Zhang

et al. 2020

J Mater Sci: Mater Electron

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Thermally activated delayed fluorescence (TADF) materials, which can harvest all excitons without utilizing any noble metals to emit light, are becoming the key cornerstone for developing the next generation of organic light-emitting diode (OLED) devices. In recent years, TADF materials are attracting numerous attentions as a new surge of research focuses on both science and industry owing to their high efficiency, low power consumption, and low production cost attributes when applied to white OLEDs. The design and application of TADF in WOLED devices have also experienced the rapid development in fundamental science and industrial technology perspectives. In the present review, the specific reverse intersystem crossing mechanism and evolution of TADF is outlined firstly, and then the latest research progress of TADF-WOLEDs is summarized and discussed. TADF/conventional fluorescence, TADF/phosphorescence, all TADF and TADF exciplex-based WOLEDs are categorized and elaborated in terms of the device structure, working mechanism, efficiency, color-rendering index, etc. Finally, we conclude with the future challenges and opportunities in high-quality TADF devices and application area.

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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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Color-stable, reduced efficiency roll-off hybrid white organic light emitting diodes with ultra high brightness

Cited by 34 publications

References 27 publications

High Performance Top‐Emitting Organic Light‐Emitting Diodes for Super Video Graphics Array Monochromatic Microdisplays Application

High Performance Top‐Emitting Organic Light‐Emitting Diodes for Super Video Graphics Array Monochromatic Microdisplays Application

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

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

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