Achieving a Record Photoluminescence Quantum Yield in Green Light‐Emitting Carbon‐Centered Radicals with Nanosecond Emission Lifetimes DOI Open Access
Man Li, Xin Li, Ying‐Feng Han

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Abstract Organic luminescent radicals possess considerable potential for applications in organic light‐emitting diodes (OLEDs)‐based visible light communication owing to their intrinsic advantages of nanosecond emission lifetimes and spin‐allowed radiative transitions. However, the inherently narrow energy bandgap multiple nonradiative channels make it difficult achieve efficient green blue light‐emitting, which is not conducive applying diverse fields. In this study, a series carbon‐centered derived from N‐heterocyclic carbenes are designed synthesized, some exhibiting hybrid local charge‐transfer (HLCT) states that resulting emission. The results photophysical characterizations theoretical calculations demonstrate luminescence efficiency closely related states. This relationship inhibits while simultaneously opening HLCT but those with locally excited Intriguingly, high photoluminescence quantum yield value up 70.1% at 534 nm observed, highest among reported date. Based on exceptional result, an OLED device fabricated achieved external 8.8%. These its application electroluminescent devices.

Language: Английский

Luminescence Efficiency Enhanced by Simple Substitutions on Donor and Acceptor in Radicals with Donor–Acceptor Structure DOI Creative Commons
Shuang Gao,

Jiahao Guan,

Lintao Zhang

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(6), P. 1191 - 1191

Published: March 7, 2025

Simple substitutions on the donor or acceptor units in radicals is an effective method to improve luminescent properties. However, luminescence efficiency of has not yet reached satisfactory levels through simple molecular structure modification. In this study, two [4-(N-Carbazolyl)-2,6-dichlorophenyl] bis(2,4,6-trichlorophenyl)methyl (Cz-TTM) radical derivatives (Mes2Cz-TTM, Mes2Cz-Mes2TTM) were synthesized and characterized by modifying carbazole (donor) tris-2,4,6-trichlorophenylmethyl (acceptor) with 2,4,6-trimethylphenyl groups. The different showed varying influences photoluminescence quantum (PLQE) compared Cz-TTM parent radical. donor-only substitution suppressed PLQE (39%) Mes2Cz-TTM. contrast, Mes2Cz-Mes2TTM exhibited a significantly higher 92.6%, 68% toluene. Additionally, thermostability photostability improved both substitutions. photophysical properties, orbitals, electrochemical behaviors also systematically explored. This strategy provides feasible approach achieve high units.

Language: Английский

Citations

0
Perspective on doublet electroluminescence from organic radicals DOI

Yeung S. Yu,

Feng Li

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(10)

Published: March 1, 2025

The doublet emission from organic open-shell monoradicals is spin-allowed, enabling 100% internal quantum efficiency when electroexcitation occurs in light-emitting diodes. Research works on luminescent radicals have shown significant potential for high-efficiency electroluminescence, achieving device efficiencies comparable to those of close-shell emitters. This Perspective reviews recent advancements spin-doublet monoradicals, highlighting molecular design principles, optimizations, and futures.

Language: Английский

Citations

0
Near-infrared organic scintillators for efficient X-ray imaging via singlet and triplet to doublet energy transfer DOI
Jiawei He, Tianhao Chen, Bin Yu

et al.

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Language: Английский

Citations

0
Achieving a Record Photoluminescence Quantum Yield in Green Light‐Emitting Carbon‐Centered Radicals with Nanosecond Emission Lifetimes DOI Open Access
Man Li, Xin Li, Ying‐Feng Han

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Abstract Organic luminescent radicals possess considerable potential for applications in organic light‐emitting diodes (OLEDs)‐based visible light communication owing to their intrinsic advantages of nanosecond emission lifetimes and spin‐allowed radiative transitions. However, the inherently narrow energy bandgap multiple nonradiative channels make it difficult achieve efficient green blue light‐emitting, which is not conducive applying diverse fields. In this study, a series carbon‐centered derived from N‐heterocyclic carbenes are designed synthesized, some exhibiting hybrid local charge‐transfer (HLCT) states that resulting emission. The results photophysical characterizations theoretical calculations demonstrate luminescence efficiency closely related states. This relationship inhibits while simultaneously opening HLCT but those with locally excited Intriguingly, high photoluminescence quantum yield value up 70.1% at 534 nm observed, highest among reported date. Based on exceptional result, an OLED device fabricated achieved external 8.8%. These its application electroluminescent devices.

Language: Английский

Citations

0