Highly efficient pure-blue organic light-emitting diodes based on rationally designed heterocyclic phenophosphazinine-containing emitters DOI Creative Commons
Yanping Huo,

Longjiang Xing,

Jianghui Wang

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Abstract Multi-resonance thermally activated delayed fluorophores have been actively studied for high-resolution photonic applications due to their exceptional color purity. However, these compounds encounter challenges associated with the inefficient spin-flip process, compromising device performance. Herein, we designed and synthesized two pure-blue emitters based on an organoboron multi-resonance core, incorporating a conformationally flexible donor, 10-phenyl-5H-phenophosphazinine 10-oxide (or sulfide). This design concept selectively modifies orbital type of high-lying excited states charge transfer configuration while simultaneously providing necessary conformational freedom enhance density without sacrificing We show that different embedded phosphorus motifs (phosphine oxide/sulfide) donor can finely tune electronic structure freedom, resulting in accelerated process through intense spin-vibronic coupling, achieving over 27-fold increase reverse intersystem crossing rate compared parent emitter. Utilizing new emitters, achieved high-performance pure blue organic light-emitting diodes, showcasing top-tier external quantum efficiency 37.6% reduced roll-offs. proposed strategy not only conventional notion electron-donors are undesirable constructing narrowband but also offers pathway designing efficient narrow-spectrum diodes.

Language: Английский

O‐B(F)←N Functionalized Copolymers with Delayed Fluorescence and P‐Type Semiconducting Characteristics DOI
Xiao-Ling Wang,

Xueyan Tan,

Junyang Jian

et al.

Macromolecular Rapid Communications, Journal Year: 2024, Volume and Issue: 45(16)

Published: May 15, 2024

Conjugated polymers with integrating properties of delayed fluorescence and photovoltaic responses simultaneously are scarcely reported due to the generally contradictory requirements for molecular structures achieve two properties. Herein, an O-B(F)←N functionalized fused unit (M) multiple resonance features, small energy gap between lowest singlet excited state (S

Language: Английский

Citations

1
Deep blue high-efficiency solution-processed triplet-triplet annihilation organic light-emitting diodes using bis(8-carbazol-N-yl)fluorene- and benzonitrile-modified anthracene/chrysene fluorescent emitters DOI

Suwapat Kongsabay,

Kasin Rueantong,

Thidarat Loythaworn

et al.

Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 116046 - 116046

Published: Sept. 1, 2024

Language: Английский

Citations

1
High External Quantum Efficiency and Ultra‐Narrowband Organic Photodiodes Using Single‐Component Photoabsorber With Multiple‐Resonance Effect DOI
Xiang Yao, Yanru Li, Yajing Sun

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 10, 2024

Organic photodiodes (OPDs) that utilize wavelength-selective absorbing molecules offer a direct approach to capturing specific wavelengths of light in multispectral sensors/imaging systems without filters. However, they exhibit broad response bandwidths, low external quantum efficiency (EQE), and often require compromises two-component photoactive materials. Herein, the first utility boron-nitrogen (BN) single-component photoabsorbers, leveraging multi-resonance effect are introduced attain OPDs with both record-high EQE 33.77% ultra-small full-width half-maximum (FWHM) 36 nm reported narrowband using photoabsorbers. It is found outstanding performance these can be attributed FWHM, slow charge recombination, activation energy, balanced bipolar transport within para-tert-butyl substituted B,N-embedded rigid polycyclic molecule (BNCz) film. Furthermore, BN derivatives such as BN(p)SCH3, BN(p)SO2CH3, pyBN-m-H have also shown high EQE, minimal tunable photoresponse peaks ranging from blue-violet blue-turquoise, highlighting potential molecular engineering development novel absorbers for advanced OPDs. Such pioneering working provide class propel advancement high-performance

Language: Английский

Citations

1
Copper‐Mediated C–H Cyclization of Heterocycles: Facile Access to Multiple Resonance Thermally Activated Delayed Fluorescence Materials DOI Open Access

Liqiu Wan,

Kangmin Wang,

Junxiang Liu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 8, 2024

Abstract Reported herein is the first example of a copper‐mediated C─H cyclization heterocycles to construct structurally diverse carbonyl‐bridged triphenylamine compounds with multiple resonance thermally activated delayed fluorescence (TADF) characteristics. The one‐pot synthesis method exhibits broad substrate scope and opens new avenue for rapidly screening high‐performance organic TADF luminescent materials. Novel single‐molecule white‐light material 5g anti‐Kasha dual‐emission character time developed shows Commission Internationale de l’Eclairage (CIE) coordinate (0.33, 0.35) in thin film, can be used fabricate robust low cost white light‐emitting diodes (LED). Furthermore, fabricated as water‐dispersed nanoparticles (NPs)NPs, which efficiently endocytosed into HeLa cells dual emission imaging living cells, two‐channel intensity ratio observe intercellular structure.

Language: Английский

Citations

0
Highly efficient pure-blue organic light-emitting diodes based on rationally designed heterocyclic phenophosphazinine-containing emitters DOI Creative Commons
Yanping Huo,

Longjiang Xing,

Jianghui Wang

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Abstract Multi-resonance thermally activated delayed fluorophores have been actively studied for high-resolution photonic applications due to their exceptional color purity. However, these compounds encounter challenges associated with the inefficient spin-flip process, compromising device performance. Herein, we designed and synthesized two pure-blue emitters based on an organoboron multi-resonance core, incorporating a conformationally flexible donor, 10-phenyl-5H-phenophosphazinine 10-oxide (or sulfide). This design concept selectively modifies orbital type of high-lying excited states charge transfer configuration while simultaneously providing necessary conformational freedom enhance density without sacrificing We show that different embedded phosphorus motifs (phosphine oxide/sulfide) donor can finely tune electronic structure freedom, resulting in accelerated process through intense spin-vibronic coupling, achieving over 27-fold increase reverse intersystem crossing rate compared parent emitter. Utilizing new emitters, achieved high-performance pure blue organic light-emitting diodes, showcasing top-tier external quantum efficiency 37.6% reduced roll-offs. proposed strategy not only conventional notion electron-donors are undesirable constructing narrowband but also offers pathway designing efficient narrow-spectrum diodes.

Language: Английский

Citations

0