Thenil and furil-imidazole-based efficient ionic green emitters with high color purity for non-doped light-emitting electrochemical cells

Puthanveedu, Archana; Shanmugasundaram, Kanagaraj; Yoon, Sunghyun; Choe, Youngson

doi:10.1039/d1tc01629f

Cited by 12 publications

(6 citation statements)

References 39 publications

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“…Compared with the LECs based on nonionic small molecules, no additional electrolytes are required for the LECs employing ionic small molecules [102,103] . Recently (2022), John et al.…”

Section: Materials For Long‐wavelength Lecsmentioning

confidence: 99%

“…Compared with the LECs based on nonionic small molecules, no additional electrolytes are required for the LECs employing ionic small molecules. [102,103] Recently (2022), John et al reported two ionic small molecules for LECs. [104] One of them (compound 85, Figure 10) showed deep-red EL emission centered at 663 nm and the corresponding CIE 1931 coordinate was (0.73, 0.27).…”

Section: Ionic Small Moleculementioning

confidence: 99%

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Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Lin

2022

Chemistry A European J

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Long‐wavelength light‐emitting electrochemical cells (LECs) are potential deep‐red and near infrared light sources with solution‐processable simple device architecture, low‐voltage operation, and compatibility with inert metal electrodes. Many scientific efforts have been made to material design and device engineering of the long‐wavelength LECs over the past two decades. The materials designed the for long‐wavelength LECs cover ionic transition metal complexes, small molecules, conjugated polymers, and perovskites. On the other hand, device engineering techniques, including spectral modification by adjusting microcavity effect, light outcoupling enhancement, energy down‐conversion from color conversion layers, and adjusting intermolecular interactions, are also helpful in improving the device performance of long‐wavelength LECs. In this review, recent advances in the long‐wavelength LECs are reviewed from the viewpoints of materials and device engineering. Finally, discussions on conclusion and outlook indicate possible directions for future developments of the long‐wavelength LECs. This review would like to pave the way for the researchers to design materials and device engineering techniques for the long‐wavelength LECs in the applications of displays, bio‐imaging, telecommunication, and night‐vision displays.

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“…Compared with the LECs based on nonionic small molecules, no additional electrolytes are required for the LECs employing ionic small molecules [102,103] . Recently (2022), John et al.…”

Section: Materials For Long‐wavelength Lecsmentioning

confidence: 99%

Section: Ionic Small Moleculementioning

confidence: 99%

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Lin

2022

Chemistry A European J

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“…A1 (1-(6-bromohexyl)-2-(4-bromophenyl)-4,5-di(thiophen-2-yl)-1 H -imidazole) and B1 (1-(6-bromohexyl)-2-(4-bromophenyl)-4,5-di(furan-2-yl)-1 H -imidazole) are synthesized according to our previous literature procedures. 38 A1 and B1 were coupled with diphenyl amino boronic acid using palladium-catalyzed Suzuki reaction. It was followed by methyl imidazole incorporation by ion exchange reaction using ammonium hexafluorophosphate to form ThAm and FuAm .…”

Section: Resultsmentioning

confidence: 99%

Facile generation of thenil and furil based blue emitters for the fabrication of non-doped and solution-processed light-emitting electrochemical cells

et al. 2022

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“…[ 38 ] Under a lower constant‐current of 10 A m −2 , the LECs based on 2 and 3 show longer half‐lifetimes of 40 h at 188 cd m −2 and 218 h at 162 cd m −2 , respectively (Figures S16 and S17, Supporting Information). The green LECs based on 2 and 3 exhibit much higher performances than the green LECs based on ionic fluorescent small‐molecules, [ 15,66 ] due to the harvest of triplet excitons for EL. Their overall performances are among the best for green LECs driven under constant‐voltages/currents reported so far.…”

Section: Resultsmentioning

confidence: 99%

Intrinsically Ionic, Thermally Activated Delayed Fluorescent Materials for Efficient, Bright, and Stable Light‐Emitting Electrochemical Cells

Song

Zhang

et al. 2021

Adv Funct Materials

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Solid-state light-emitting electrochemical cells (LECs) using sustainable and eco-friendly materials and affording high brightness, efficiency, and stability are highly desired. Here, intrinsically ionic, thermally activated delayed fluorescence (TADF) materials 1-3 for efficient, bright, and stable LECs are reported. 1-3 feature carbazole-type donors and cationic triazine-type acceptors, which are located ortho to each other on the phenyl linkers. Through-space chargetransfer (CT) dominates the CT transitions in 1-3. In doped and neat films, 1-3 show blue and green TADF emission, respectively, with reverse intersystem crossing rates at around 7.0 × 10 5 s −1 . 1-3 possess excellent electrochemical stability (except for the oxidation of 1) and film-forming abilities. LECs using neat films of 1-3 as the single active layers afford green electroluminescence with peak brightness/peak external quantum efficiency (EQE) of up to 572 cd m −2 /6.8% under 4.0 V and peak brightness/peak EQE/halflifetime of up to 860 cd m −2 /5.4%/48 h under 50 A m −2 . A longer half-lifetime of 218 h has further been achieved at 162 cd m −2 under 10 A m −2 . The work reveals the bright prospect for the development of efficient, bright, and stable LECs with intrinsically-ionic TADF materials.

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Thenil and furil-imidazole-based efficient ionic green emitters with high color purity for non-doped light-emitting electrochemical cells

Abstract: The future artificial lighting devices ought to be efficient, economical, and environmentally benign that are free from rare metals like iridium. In this regard, we report a step towards this...

Cited by 12 publications

References 39 publications

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Long‐Wavelength Light‐Emitting Electrochemical Cells: Materials and Device Engineering

Facile generation of thenil and furil based blue emitters for the fabrication of non-doped and solution-processed light-emitting electrochemical cells

Intrinsically Ionic, Thermally Activated Delayed Fluorescent Materials for Efficient, Bright, and Stable Light‐Emitting Electrochemical Cells

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