Robust luminogens as cutting-edge tools for efficient light emission in recent decades

Jayabharathi, Jayaraman; Thanikachalam, Venugopal

doi:10.1039/d4cp00737a

Multiple Resonance Quasi‐fluorescence from BN‐Doped Aromatic Compounds Modified with “Naphthalene” Units Approaches the BT.2020 Green Light Standard

Feng,

Nie,

Liu

et al. 2024

Angewandte Chemie

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Creating fluorophores that meet the Broadcast Service Television 2020 (BT.2020) standard is a significant achievement. In this paper, we present an innovative strategy that could revolutionize the development of high‐performance narrowband fluorophores for ultra‐high‐definition displays. Our approach combines classic multi‐resonance BN‐doped fragments with naphthalene, creating two novel narrowband bright green quasi‐fluorescent emitters, NT‐2B and NT‐3B. When tested in dilute toluene, these molecules exhibit emission peaks at 510 and 511 nm with extremely narrow FWHM values of 15 and 14 nm, respectively. Both molecules also demonstrate conventional fluorescence properties with high photoluminescence quantum yields (PLQYs) of up to 85%. Notably, OLEDs containing NT‐2B achieve a peak EQE of approximately 30% and at a doping concentration of 5 wt.%, OLEDs based on NT‐2B achieve a CIEy value of roughly 0.75, closely matching the BT.2020 standard.

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Multiple Resonance Quasi‐fluorescence from BN‐Doped Aromatic Compounds Modified with “Naphthalene” Units Approaches the BT.2020 Green Light Standard

Feng,

Nie,

Liu

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

Creating fluorophores that meet the Broadcast Service Television 2020 (BT.2020) standard is a significant achievement. In this paper, we present an innovative strategy that could revolutionize the development of high‐performance narrowband fluorophores for ultra‐high‐definition displays. Our approach combines classic multi‐resonance BN‐doped fragments with naphthalene, creating two novel narrowband bright green quasi‐fluorescent emitters, NT‐2B and NT‐3B. When tested in dilute toluene, these molecules exhibit emission peaks at 510 and 511 nm with extremely narrow FWHM values of 15 and 14 nm, respectively. Both molecules also demonstrate conventional fluorescence properties with high photoluminescence quantum yields (PLQYs) of up to 85%. Notably, OLEDs containing NT‐2B achieve a peak EQE of approximately 30% and at a doping concentration of 5 wt.%, OLEDs based on NT‐2B achieve a CIEy value of roughly 0.75, closely matching the BT.2020 standard.

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Spiral Polycyclic Aromatic Hydrocarbons Embedded in the B/N Center for Constructing Highly Efficient Multiple Resonance TADF Emitters

Ge,

Wu,

Liu

et al. 2024

Preprint

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Introducing spiral polycyclic aromatic hydrocarbons (PAHs) in multiple resonances thermally activated delayed fluorescence (MR-TADF) emitters to achieve small FWHM values and high efficiency remains a formidable challenge. This research departs from the conventional molecular design strategy that utilizes spiral PAHs solely as side chains, terminal groups, or linkage units. Instead, we integrate the rigid 9,9'-spirobi[fluorene] (SF) unit fully or partially into the boron/ nitrogen MR (B/N-MR) emitting core and successfully developed a range of brand-new proof-of-concept isomerized MR-TADF emitters, SF-BN1, SF-BN2, SF-BN3, and SF-BN4. Remarkably, these novel emitters exhibit exceptionally narrow full-width at half-maximum (FWHM) values of 15～21 nm in dilute toluene solutions and high photoluminescence quantum yields (PLQYs) of up to 90% in doped films. The corresponding organic light-emitting diode (OLED) based on SF-BN1 achieved high external quantum efficiency (EQE) of up to 29.0%, with CIE coordinates of (0.13, 0.08), closely aligning with the BT.2020 blue emission standard. Sky-blue OLEDs based on SF-BN3 can achieve a high EQE of 29.8%, with an exceptionally highly narrow FWHM value of 18 nm; the hyperfluorescent OLEDs based on SF-BN3 improved the EQE of 35.5%. Moreover, we elucidated subtlevariations in the connectivity of chemical functional groups within emitters, as well as the polar environment and doping concentrations of OLEDs, which can significantly impact the optical and electroluminescent properties of these isomers. This research unveils new opportunities for exploration and yields potential novel luminescent materials suitable for ultra-high-definition (UHD) display technologies.

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Robust luminogens as cutting-edge tools for efficient light emission in recent decades

Abstract: Blue luminogens play a vital role in white lighting and potential metal-free fluorescent materials and their high-lying excited states contribute to harvesting triplet excitons in devices.

Cited by 3 publications

References 240 publications

Multiple Resonance Quasi‐fluorescence from BN‐Doped Aromatic Compounds Modified with “Naphthalene” Units Approaches the BT.2020 Green Light Standard

Multiple Resonance Quasi‐fluorescence from BN‐Doped Aromatic Compounds Modified with “Naphthalene” Units Approaches the BT.2020 Green Light Standard

Multiple Resonance Quasi‐fluorescence from BN‐Doped Aromatic Compounds Modified with “Naphthalene” Units Approaches the BT.2020 Green Light Standard

Spiral Polycyclic Aromatic Hydrocarbons Embedded in the B/N Center for Constructing Highly Efficient Multiple Resonance TADF Emitters

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