Trifluoromethyl-substituted 9,9'-bianthracene derivative as host material for highly efficient blue OLED

Gao, Feng; Ren, Jing; Li, Zhanfeng; Yuan, Shuqing; Wu, Zhaoxin; Cui, Yanxia; Jia, Hanxiang; Wang, Hua; Shi, Fang; Hao, Yuying

doi:10.1364/ome.5.002468

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…Behaviors where efficiency roll-off is accompanied by a plateau or roll-off in output, are also known. [43][44][45] Asymptotic output can be produced in principle by polaron quenching, or by singlet-triplet annihilation, as will be discussed in II D. Output roll-off within the operating range of the device, seems to require a new loss mechanism which will be described here. We continue with units chosen such that there is one molecule per unit volume so that N 0 + N = 1, and for numerical evaluations we set τ sp = 1 which gives us approximately ns and nm 3 for typical materials.…”

Section: Annihilation Bleaching and Roll-offmentioning

confidence: 95%

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Efficiency and Stimulated Emission in Quarter Wave OLEDS

Nelson

2016

Preprint

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Quarter-wave OLEDS are microcavity devices that can operate in the low finesse limit and achieve high efficiency (> 300 lm/W) by using interference to reduce the onset current for the transition to stimulated emission. In this work we study the transition to stimulated emission and compare the kinetics and electrical properties of conventional and quarter-wave devices. We show that suppression of spontaneous emission into the vertical mode can result in a sharp transition to stimulated emission at (γ/eV a ) I ∼ N SE /τ sp , where N SE /τ sp is determined by optical parameters, and we find a previously observed electrical signature for the transition where the excited state population becomes fixed at low current density. We then study the role of loss mechanisms in the quarter-wave configuration and conclude with some requirements for practical devices. I. INTRODUCTIONLight production in organic light emitting diodes (OLEDS) comprises a broad set of topics spanning material properties, electrical, spectral and photochemical processes, and classical and quantum optics.[1] OLEDS are typically formed by layers of organic and metallo-organic materials deposited between two electrodes. Charge is injected as holes and electrons which then migrate inwards and recombine to form excited states that can then be quenched, undergo intersystem crossing, migrate, or relax and produce light, some of which exits from a vertical mode as useful light and some of which may go into other modes in the device and substrate and exit as wasted light and heat. There is often a wavelength scale separation between two parallel reflective interfaces so that the device formally meets the definition of a microcavity.[2] While developments in materials and device architecture have contributed to improvements in internal efficiency and outcoupling, important issues remain in efficiency, roll-off and device lifetime. [3,4]. An avenue for improvement in these areas is the role of device architecture in manipulating the kinetics of light production.As is well known, emission of light results when an electronic transition is able to couple to an allowed mode.[5-7] A cavity is thus able to enhance or suppress emission [8,9] and alter the kinetics and behavior of the device. [10,11] An emitter located at an odd multiple of 1/4 wavelength

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Section: Annihilation Bleaching and Roll-offmentioning

confidence: 95%

“…The infinity in charge is avoided for N SE < 1 after which the system transitions to stimulated emission. Instead we consider a finite maximum charge density, and then equation (45) gives us a limit on the excited state population as,…”

Section: Annihilation Bleaching and Roll-offmentioning

confidence: 99%

Efficiency and Stimulated Emission in Quarter Wave OLEDS

Nelson

2016

Preprint

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“…In addition, the introduction of a bulky 3-(trifluoromethyl)phenyl) unit into the anthracene core can efficiently prevent the intermolecular aggregations and reduce self-quenching behaviors. Although several fluorinated DAA derivatives at the 9,10-position of the anthracene groups as noticeable blue host materials have been reported [40,41], the example of 2-fluorinated DAA compounds has never been studied.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes

Kwak

Lee

et al. 2017

Applied Sciences

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Diaryl-substituted anthracene derivatives containing 3-(trifluoromethyl)phenyl) groups, 9,10-diphenyl-2-(3-(trifluoromethyl)phenyl)anthracene (1), 9,10-di([1,1 -biphenyl]-4-yl)-2-(3-(trifluoromethyl)phenyl)anthracene (2), and 9,10-di(naphthalen-2-yl)-2-(3-(trifluoromethyl)phenyl) anthracene (3) were synthesized and characterized. The compounds 1-3 possessed high thermal stability and proper frontier-energy levels, which make them suitable as host materials for blue organic light-emitting diodes. The electroluminescent (EL) emission maximum of the three N,N-diphenylamino phenyl vinyl biphenyl (DPAVBi)-doped (8 wt %) devices for compounds 1-3 was exhibited at 488 nm (for 1) and 512 nm (for 2 and 3). Among them, the 1-based device displayed the highest device performances in terms of brightness (L max = 2153.5 cd·m −2 ), current efficiency (2.1 cd·A −1 ), and external quantum efficiency (0.8%), compared to the 2-and 3-based devices.

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“…However, deep blue OLEDs still suffer from low uorescence quantum yields due to bipolar quenching, as well as large bathochromic shis for the enlarged p-conjugation of D-A type uorophores. Based on twisted 9,9 0 -bianthracene, which can break the local pconjugation, [13][14][15][16][17][18][19][20][21] Liu et al previously developed a 9,9 0bianthracene-cored molecule featuring twisted ICT (TICT) to enhance radiative exciton generation for highly efficient deep blue OLEDs with an EQE of 3.9%. 15 To further develop the properties of 9,9 0 -bianthracene-cored derivatives, we have synthesized a series of uorinated and tert-butylated bianthracene derivatives, and used these compounds to serve as blue materials for high-performance uorescent OLEDs with TICT excited states.…”

Section: Introductionmentioning

confidence: 99%

“…15 To further develop the properties of 9,9 0 -bianthracene-cored derivatives, we have synthesized a series of uorinated and tert-butylated bianthracene derivatives, and used these compounds to serve as blue materials for high-performance uorescent OLEDs with TICT excited states. [16][17][18][19][20] In this work, we report a new deep blue uorophore, MBAn-(4)-tBu (10,10 0 -bis-(4-tert-butyl-phenyl)-3,3 0 -dimethyl-9,9 0 -bianthracene), which has a non-D-A structure instead of the conventional D-A structure, which was derived from BAn-(4)-tBu, reported by our group. The 3,3 0 -dimethyl-9,9 0 -bianthracene (MBAn) moiety of MBAn-(4)-tBu could enhance the steric hindrance from the strong repulsion between the neighboring hydrogen atoms of anthracene and those of the tert-butyl group, simultaneously suppressing the intermolecular interactions and maintaining a high efficiency in the solid state.…”

Section: Introductionmentioning

confidence: 99%