Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs DOI Creative Commons
Xiugang Wu,

Songqian Ni,

Chih‐Hsing Wang

et al.

Chemical Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

Fluorescence emitters with a multiple-resonant (MR) effect have become research hotspot. These MR mainly consist of polycyclic aromatic hydrocarbons boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement the highest occupied molecular orbital lowest unoccupied facilitates MR, resulting in smaller internal reorganization energy narrower emission bandwidth. Optimal charge separation suppresses gap between singlet triplet excited states, favoring thermally activated delayed fluorescence (TADF). MR-TADF materials, due to color purity high efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; particular, limitation imposed by alternated core configuration hinders their diversity versatility. Most existing materials concentrated blue-green range, only few red near-infrared spectra. This review provides timely comprehensive screening from pioneering work present. Our goal is gain understandings structure-performance relationship both basic advanced perspectives. Special emphasis placed on exploring correlations chemical structure, photophysical properties electroluminescent performance depth breadth an aim promote future development emitters.

Language: Английский

High‐Efficiency Solution‐Processed Organic Light‐Emitting Diodes Utilizing Multiple‐Resonance Emitters Incorporating Thiocarbazole Unit DOI Open Access
Shihua Li,

Maoqiu Li,

Yanru Li

et al.

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

Published: Feb. 5, 2025

Abstract Introducing heavy atoms to enhance spin‐orbit coupling represents an effective strategy for boosting the reverse intersystem crossing (RISC) rate constants of Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters. Nevertheless, restricted diversity molecular structures obstructs a thorough investigation structure‐property relationships, thereby limiting improvement device performance, especially in case solution‐processed devices. Herein, alkylthio‐substituted carbazole building block is designed and developed two new MR‐TADF emitters, namely BNCz‐2S BNCz‐4S. Quantum simulations photophysical studies have revealed that as number sulfur increases, BNCz‐4S exhibits higher photoluminescence quantum yield (PLQY), smaller singlet‐triplet energy gap (Δ E ST ) reorganization energy, along with larger (SOC) constant ( k RISC compared BNCz‐2S. Consequently, solution‐processing devices based on exhibit external efficiency (EQE) 24.06%, which first tier reported organic light‐emitting diodes (OLED) date.

Language: Английский

Citations

0
Synthesis and luminescent properties of spiroindoloacridine-fluorene (SIAF)/oxadiazole hybrids as deep-blue emitters DOI

Shuomei Zhang,

Tianzhi Yu, Da Chen

et al.

Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 116410 - 116410

Published: March 1, 2025

Language: Английский

Citations

0
Engineering Nitrogen/Carbonyl MR‐TADF Emitters: Spiro‐Lock and Tert‐Butyl Synergy in Narrowband Blue Emission DOI
Hongyan Yan, Dong‐Ying Zhou,

Shi‐Jie Ge

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 30, 2025

Abstract Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters with rigid planar structures are promising for their exceptional color purity and outstanding device efficiency. However, as an important MR unit, rigidly interlocked nitrogen/carbonyl‐based blue materials often face challenges like spectral broadening, red‐shifting, reduced efficiency compared to nitrogen/boron system. Herein, a peripheral modification strategy incorporating tert ‐butyl groups via spiro‐lock framework is used synthesize four molecules: QAO‐TF, TQAO‐TF, TQAO‐F, TSOQ. The structure solidifies the molecular framework, narrows emission bandwidth, elevates photoluminescence quantum yield over 96%. Meanwhile, introduce steric hindrance, isolating luminescent core suppressing intermolecular interactions in solid state, thereby improving while maintaining narrowband emission. Notably, TQAO‐F shows electroluminescence peak at 476 nm 25 full width half maximum (FWHM) external (EQE) of 31.7%. TSOQ, its oxygen‐induced charge effect, achieves pure FWHM 20 nm, surpassing 30% EQE without sensitizers. This overall performance suggests potential rival classic

Language: Английский

Citations

0
A Spiro[Fluorene-9,9ʹ-Xanthene] Based Sky-Blue Emitter with Hybridized Local and Charge-Transfer (HLCT) Characteristic for Solution-Processed OLEDs DOI

Enting Zhou,

Qiyin Chen,

Xiao Long

et al.

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121279 - 121279

Published: April 1, 2025

Language: Английский

Citations

0
Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs DOI Creative Commons
Xiugang Wu,

Songqian Ni,

Chih‐Hsing Wang

et al.

Chemical Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

Fluorescence emitters with a multiple-resonant (MR) effect have become research hotspot. These MR mainly consist of polycyclic aromatic hydrocarbons boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement the highest occupied molecular orbital lowest unoccupied facilitates MR, resulting in smaller internal reorganization energy narrower emission bandwidth. Optimal charge separation suppresses gap between singlet triplet excited states, favoring thermally activated delayed fluorescence (TADF). MR-TADF materials, due to color purity high efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; particular, limitation imposed by alternated core configuration hinders their diversity versatility. Most existing materials concentrated blue-green range, only few red near-infrared spectra. This review provides timely comprehensive screening from pioneering work present. Our goal is gain understandings structure-performance relationship both basic advanced perspectives. Special emphasis placed on exploring correlations chemical structure, photophysical properties electroluminescent performance depth breadth an aim promote future development emitters.

Language: Английский

Citations

0