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

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

doi:10.1039/d1tc05542a

Cited by 5 publications

(2 citation statements)

References 47 publications

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“…Fundamental research has resulted in an improved understanding of the complex LEC working mechanism, [4][5][6] which in turn has paved the way for devices with increased efficiency, a broader color gamut, and prolonged operational lifetime. [6][7][8] The most common emitting materials in LECs are conjugated polymers, [6,[9][10][11] small molecules, [12][13][14][15][16] quantum dots, [17][18][19][20] and ionic transition metal complexes (iTMCs). [10,[21][22][23][24] The latter are particularly efficient as spin-orbit coupling (SOC) enables for harvesting of all electrically generated excitons (i.e., both triplets and singlets) for light emission.…”

Section: Introductionmentioning

confidence: 99%

Broadband White‐Light‐Emitting Electrochemical Cells

Adranno

Tang

Paterlini

et al. 2023

Advanced Photonics Research

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Emerging organic light‐emitting devices, such as light‐emitting electrochemical cells (LECs), offer a multitude of advantages but currently suffer from that most efficient phosphorescent emitters are based on expensive and rare metals. Herein, it is demonstrated that a rare metal‐free salt, bis(benzyltriphenylphosphonium)tetrabromidomanganate(II) ([Ph3PBn]2[MnBr4]), can function as the phosphorescent emitter in an LEC, and that a careful device design results in the fact that such a rare metal‐free phosphorescent LEC delivers broadband white emission with a high color rendering index (CRI) of 89. It is further shown that broadband emission is effectuated by an electric‐field‐driven structural transformation of the original green‐light emitter structure into a red‐emitting structure.

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Section: Introductionmentioning

confidence: 99%

Broadband White‐Light‐Emitting Electrochemical Cells

Adranno

Tang

Paterlini

et al. 2023

Advanced Photonics Research

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“…[1][2][3][4][5] The intrinsic advantages of the simple device architecture, air-stable cathodes, and low driving voltages make LECs suitable for low-cost and large-area solutionprocessable production on various substrates (including flexible substrates). 3,6,7 Over the past two decades, significant efforts have been devoted to accelerating the development of LECs including the material molecular designs, device fabrication techniques, as well as operation mechanism studies. 2,[8][9][10][11][12][13][14] Harvesting both electrogenerated singlet exciton and triplet exciton, in principle, can achieve 100% internal quantum efficiency during the conversion process from electron to photon.…”

Section: Introductionmentioning

confidence: 99%

Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells

et al. 2023

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The 8‐Hydroxyquinolinium Cation as a Lead Structure for Efficient Color‐Tunable Ionic Small Molecule Emitting Materials

Adranno

Renier

Bousrez

et al. 2023

Advanced Photonics Research

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Albeit tris(8‐hydroxyquinolinato) aluminum (Alq3) and its derivatives are prominent emitter materials for organic lighting devices, and the optical transitions occur among ligand‐centered states, the use of metal‐free 8‐hydroxyquinoline is impractical as it suffers from strong nonradiative quenching, mainly through fast proton transfer. Herein, it is shown that the problem of rapid proton exchange and vibration quenching of light emission can be overcome not only by complexation, but also by organization of the 8‐hydroxyquinolinium cations into a solid rigid network with appropriate counter‐anions (here bis(trifluoromethanesulfonyl)imide). The resulting structure is stiffened by secondary bonding interactions such as π‐stacking and hydrogen bonds, which efficiently block rapid proton transfer quenching and reduce vibrational deactivation. Additionally, the optical properties are tuned through methyl substitution from deep blue (455 nm) to blue‐green (488 nm). Time‐dependent density functional theory (TDFT) calculations reveal the emission to occur from which an unexpectedly long‐lived S1 level, unusual for organic fluorophores. All compounds show comparable, even superior photoluminescence compared to Alq3 and related materials, both as solids and thin films with quantum yields (QYs) up to 40–50%. In addition, all compounds show appreciable thermal stability with decomposition temperatures above 310 °C.

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

Abstract: Environmentally sustainable, energy-efficient and economical devices have drawn great attention and are considered to be the future of artificial lighting device market. Taking this into account, we have designed and...

Cited by 5 publications

References 47 publications

Broadband White‐Light‐Emitting Electrochemical Cells

Broadband White‐Light‐Emitting Electrochemical Cells

Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells

The 8‐Hydroxyquinolinium Cation as a Lead Structure for Efficient Color‐Tunable Ionic Small Molecule Emitting Materials

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