Structural Optimization of BODIPY Derivatives: Achieving Stable and Long-Lived Green Emission in Hyperfluorescent OLEDs

Gawale, Yogesh; Palanisamy, Paramasivam; Lee, Hyun Seung; Chandra, Ajeet; Kim, Hae Ung; Ansari, Rasheeda; Chae, Mi Young; Kwon, Jang Hyuk

doi:10.1021/acsami.4c02002

Cited by 5 publications

(1 citation statement)

References 56 publications

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“…To achieve a wide color gamut, highly efficient and ultrapure blue, green, and red PL emission with a narrow bandwidth is extremely crucial according to the International Telecommunication Union Recommendation (Rec.) 2020 standard. − Comparing with pure blue and red light emission, green emission has garnered the most intensive attention because of the highest sensitivity to the human eye . In the past several decades, β-SiAlON:Eu(II) green phosphor has been utilized to assemble LED owing to the high photoluminescence quantum yield (PLQY) (52.2%) and narrow fwhm (55 nm).…”

Section: Introductionmentioning

confidence: 99%

Crystal-Rigidifying Strategy in Hybrid Manganese Halide to Achieve Narrow Green Emission and High Structural Stability

Yu,

Li,

Yang

et al. 2024

Inorg. Chem.

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Although organic−inorganic hybrid Mn 2+ halides have advanced significantly, achieving high stability and narrow-band emission remains enormously challenging owing to the weak ionic nature and soft crystal lattice of the halide structure. To address these issues, we proposed a cationic engineering strategy of long-range cation π•••π stacking and C−H•••π interactions to simultaneously improve the crystal structural stability and rigidity. Herein, two organic zero-dimensional (0D) manganese halide hybrids of (BACQ) 2 MnX 4 [BACQ = 4-(butylamino)-7-chloroquinolin-1-ium; X = Cl and Br] were synthesized. (BACQ) 2 MnX 4 display strong green-light emissions with the narrowest full width at half-maximum (fwhm) of 39 nm, which is significantly smaller than those of commercial green phosphor β-SiAlON:Eu 2+ and most of reported manganese halides. Detailed Hirshfeld surface analyses demonstrate the rigid environment around the [MnX 4 ] 2− units originating from the interactions between [BACQ] + . The rigid crystal structure weakens the electron−phonon coupling and renders narrow fwhm of these manganese halides, which is further confirmed by temperature-dependent emission spectra. Remarkably, (BACQ) 2 MnX 4 realizes outstanding structural and luminescence stabilities in various extreme environments. Benefiting from the excellent performance, these Mn 2+ halides are used to assemble light-emitting diodes with a wide color gamut of 105% of the National Television System Committee 1931 standard, showcasing the advanced applications in liquid-crystal-display backlighting.

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Section: Introductionmentioning

confidence: 99%

Crystal-Rigidifying Strategy in Hybrid Manganese Halide to Achieve Narrow Green Emission and High Structural Stability

Yu,

Li,

Yang

et al. 2024

Inorg. Chem.

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Energy Transfer for Constructing Circularly Polarized Luminescence Materials: Recent Progress and Future Prospects

Zhang,

Zhong,

Yang

et al. 2024

Adv Funct Materials

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Circularly polarized luminescence (CPL) materials hold significant promise in multidisciplinary fields such as circularly polarized organic light‐emitting diodes, biological probes, data storage, and information encryption. However, these cutting‐edge applications also put forward higher requirements for the design of CPL materials, requiring large dissymmetry factor and high emission quality. For this purpose, diverse approaches have been explored to generate and enhance CPL emission. Among them, energy transfer (ET) strategy stands out as it can be readily implemented in a wide range of CPL materials. The present work overviews latest advances in energy transfer for generating and modulating CPL, involving small organic molecules, polymers, metal complexes, liquid crystals, as well as new‐emerging chiral luminescent materials. It is anticipated that the review article will garner increased attention toward energy transfer systems and facilitate the advancement of CPL materials.

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Introducing of an Unexplored Aza-BODIPY Diradicaloids with 4-(2,6-Ditert-butyl)phenoxyl Radicals Located in 1,7-Positions of the Aza-BODIPY Core

Oyelowo,

Schaffner,

Jeaydi

et al. 2024

Inorg. Chem.

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We have prepared and characterized two diradicaloid systems 5a and 5b that originated from the oxidation of a 1,7-(4-(2,6-di-tert-butyl)phenol)-substituted aza-BODIPY core. The aza-BODIPY diradicaloids were characterized by a large array of experimental and computational methods. The diamagnetic closed-shell state was postulated as the ground state in solution and a solid-state with the substantial thermal population originating from both open-shell diradical and open-shell triplet states observed at room temperature. Transient absorption spectroscopy indicates fast (<10 ps) excited state deactivation pathways associated with the target compounds' diradical character in solution at room temperature. Variable-temperature 1 H NMR spectra indicate the solvent dependency of the diradical character in 5a and 5b. The diradicaloids could be stepwise reduced to the mixed-valence radical-anion and dianion states upon consequent single-electron reductions. Similarly, deprotonated 1,7-(4-(2,6-di-tert-butyl)phenol)-substituted aza-BODIPYs can be oxidized to the diradicaloid form. Both mixed-valence and dianionic forms exhibit an intense absorption in the NIR region. Density functional theory (DFT) and time-dependent DFT calculations were used to explain the transformations in the UV−Vis-NIR spectra of all target compounds.

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Structural Optimization of BODIPY Derivatives: Achieving Stable and Long-Lived Green Emission in Hyperfluorescent OLEDs

Cited by 5 publications

References 56 publications

Crystal-Rigidifying Strategy in Hybrid Manganese Halide to Achieve Narrow Green Emission and High Structural Stability

Crystal-Rigidifying Strategy in Hybrid Manganese Halide to Achieve Narrow Green Emission and High Structural Stability

Energy Transfer for Constructing Circularly Polarized Luminescence Materials: Recent Progress and Future Prospects

Introducing of an Unexplored Aza-BODIPY Diradicaloids with 4-(2,6-Ditert-butyl)phenoxyl Radicals Located in 1,7-Positions of the Aza-BODIPY Core

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