Achievement of complete electromer emission in organic light-emitting diodes

Xu, Xinjun; Yu, Gui; Ma, Yongqiang; Shao, Kuan; Yang, Lian‐Ming; Liu, Yunqi

doi:10.1016/j.jlumin.2012.11.036

Cited by 10 publications

(7 citation statements)

References 43 publications

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“…In these gated OLEDs with consistent drain voltage at 6 V, the red emissions decreased with improved electron injection modulated by increasing gate modulation from 2 V to 8 V with the interval of 2 V. This indicates that the formation of electromers is favored in less balanced electron hole condition, which usually leads to low current efficiency . For examples, one can expect the formation of electromer when an electron enters into the hole dominant system . With more electrons, and then more balanced electron and hole, the formation of electric excited monomers become prevailing.…”

Section: Applicationsmentioning

confidence: 99%

Gate Tunable Organic Light Emitting Diodes: Principles and Prospects

Li¹

2018

The Chemical Record

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This record summarizes our recent developments on gate-tunable organic light-emitting diodes (OLEDs). The key point is to modulate the charge carrier injection barrier by the applied gate potential. One way is to electrochemically dope charge carrier injection layer through porous electrodes. The electrochemically doped charge carrier layer thus form gate-tunable contact with porous electrodes. Another way is to modulate the work-function of electrodes that can have varied charge carrier injection barriers following the applied gate potential. Gate-tunable OLEDs based on these two working principles have been fabricated, characterized and demonstrated for displaying simple digitals and letters. New materials including dielectric, porous electrodes, work function tunable electrodes, and charge carrier injection materials have been further explored for performance improvement.

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Section: Applicationsmentioning

confidence: 99%

Gate Tunable Organic Light Emitting Diodes: Principles and Prospects

Li¹

2018

The Chemical Record

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“…We can extract electromer emission by adding quenching agents for excitonic emission. 27 WOLEDs can be obtained by combining electromer emission and other emissions. 25,26 We are using a blend of 4,4′-cyclohexylidenebis-[N,N-bis(4-methylphenyl)benzenamine] (TAPC) and 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1H-benzimidazole) (TPBi) as the emissive layer in our devices.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the reports with OLEDs having electromer emission, multipeak emission is observed in which one emission would be electromer emission and other emissions could be monomer, excimer, exciplex or electroplex emissions. , Some researchers focus on the electromer-only emission. We can extract electromer emission by adding quenching agents for excitonic emission . WOLEDs can be obtained by combining electromer emission and other emissions. , We are using a blend of 4,4′-cyclohexylidenebis[ N , N -bis(4-methylphenyl)benzenamine] (TAPC) and 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1 H -benzimidazole) (TPBi) as the emissive layer in our devices.…”

Section: Introductionmentioning

confidence: 99%

White Organic Light-Emitting Diodes from Single Emissive Layers: Combining Exciplex Emission with Electromer Emission

et al. 2021

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In this work, white light emission from the blend of a hole transport material, 4,4′-cyclohexylidene bis[N,N-bis(4-methylphenyl)benzenamine] (TAPC), and an electron transport material, 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1H-benzimidazole) (TPBi), was explored. Organic light-emitting diodes fabricated with the TAPC/TPBi blend as a single emissive layer showed sky blue exciplex emission at low voltages and yellow electromer emission at high voltages. Simultaneous emission of the blue exciplex and yellow electromer can be tuned to obtain pure white light emission. By combining the exciplex emission with field-induced electromer emission, pure white light emission with CIE color coordinates of (0.34, 0.31) was achieved. Transient electroluminescence measurements reveal the nature of the emission species. Electromer emission has significantly long-lived components as compared to the exciplex. The long electroluminescence decay obtained from electromer emission indicates possible utilization of triplet excitons in radiative recombination.

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“…To further study this exciplex emission, EL characteristics of organics:APDC‐tPh (molar ratio of 1:1) based devices with various donors are investigated, including m‐MTDATA, Zn(BTZ) 2 , and CBP 29,30. These exciplex based devices all show red‐shift emission of 945 nm (1.31 eV), 708 nm (1.75 eV), and 615 nm (2.02 eV), comparing with component parts.…”

Section: Resultsmentioning

confidence: 99%

Exciplex‐Based Organic Light‐Emitting Diodes with Near‐Infrared Emission

Yuan

et al. 2020

Advanced Optical Materials

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Near‐infrared exciplex can weaken molecular design difficulties, and has the advantage of easy bathochromic‐shift spectra via selecting the suitable electron donors and acceptors. In this contribution, exciplex is applied to fabricate near‐infrared (NIR) organic light‐emitting diodes (OLEDs) incorporating a synthesized fluorescent material 3‐([1,1″:3′,1″‐terphenyl]‐5′‐yl)acenaphtho[1,2‐b]pyrazine‐8,9‐dicarbonitrile (APDC‐tPh) and a commercially available material 4,4′,4″‐tris(carbazol‐9‐yl)triphenylamine (TCTA). The device having a mixed TCTA:APDC‐tPh as an emitting layer shows a 730 nm NIR emission with a maximum external quantum efficiency (EQE) of about 0.1%, while the device having 2‐[4‐(diphenylamino)phenyl]‐10,10‐dioxide‐9H‐thioxanthen‐9‐one (TXO‐TPA):APDC‐tPh as the emitting layer exhibits an emission peak of 704 nm with a maximum EQE of 1.27%. These results prove the feasibility of fabricating the efficient exciplex‐based NIR OLEDs.

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Achievement of complete electromer emission in organic light-emitting diodes

Cited by 10 publications

References 43 publications

Gate Tunable Organic Light Emitting Diodes: Principles and Prospects

Gate Tunable Organic Light Emitting Diodes: Principles and Prospects

White Organic Light-Emitting Diodes from Single Emissive Layers: Combining Exciplex Emission with Electromer Emission

Exciplex‐Based Organic Light‐Emitting Diodes with Near‐Infrared Emission

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