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‐Performance Solution Processable Red TADF‐OLED with External Quantum Efficiency Exceeding 28% Using a Multi‐Resonance Emitter Host DOI
Xiaolong Liu,

Lei Hua,

Xiaoyi Lai

et al.

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

Published: April 7, 2025

Abstract Achieving high‐efficiency soluble red thermally activated delayed fluorescence (TADF) emitters remains a substantial challenge owing to the constraints imposed by energy‐gap law. In this study, an asymmetric pyrene‐azaacene derivative, named PBCNT, is prepared and characterized, featuring strong electron‐donating tert ‐butyl diphenylamine moiety electron‐withdrawing cyano group. PBCNT exhibits intense emission with peak wavelength of 664 nm in toluene solution. It demonstrates evident TADF character solid state, attributed small energy difference 0.04 eV between its lowest singlet triplet states. By employing multi resonance‐type molecule as host matrix, solution‐processed organic light‐emitting diode (OLED) based on achieved record‐high maximum external quantum efficiency (EQE) 28.5%, at 608 nm, facilitated effective Förster transfer, good horizontal emitting dipole orientation managed intermolecular interactions dopant. This represents one highest EQE values reported among OLEDs electroluminescence wavelengths greater than 600 nm. paper introduces promising pathway for developing efficient that overcome limitations

Language: Английский

Citations

1
Tuning photoluminescence and electroluminescence of multi-resonance thermally activated delayed fluorescence emitters through peripheral donor modification for highly efficient deep-blue OLEDs DOI
Chengli Hou, Sai Guo, Yueming Sun

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160880 - 160880

Published: Feb. 1, 2025

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
Multifunctional Hot‐Exciton Fluorophore Enabling Efficient Non‐Doped Blue Electron‐Fluorescence with Negligible Efficiency Roll‐Off and Phosphorescent OLEDs with Ultra‐Low Power Consumption DOI Open Access

Yufu Sun,

Xifeng Fu,

Chengli Hou

et al.

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

Published: March 28, 2025

Abstract One of the most critical challenges in organic light‐emitting diodes (OLEDs) is development efficient blue emitters, which require high exciton utilization efficiency, short lifetime, and well‐balanced carrier mobility. Herein, a hot emitter, TPA‐SBF‐OXZ, synthesized by incorporating triphenylamine donor an oxadiazole acceptor into spirobifluorene (SBF) skeleton. TPA‐SBF‐OXZ exhibits photoluminescence quantum yield 70.7%, balanced hole electron mobilities neat film. Additionally, due to anti‐aggregation‐caused‐quenching characteristics SBF skeleton, non‐doped OLED achieves maximum external efficiency (EQE) 10.6% at 2396 cd cm −2 10.2% even 11181 , ranking leading position fluorescent OLEDs. The proof‐of‐concept phosphorescent using as host remarkable performance metrics, including ultra‐low turn‐on voltage 2.2 V, EQE 30.4%, power 109.1 lm W −1 exceptionally luminance over 130000 m . This work offers feasible approach for high‐performance electro‐fluorescence low power‐consumption PhOLEDs.

Language: Английский

Citations

0
Blue Thermally Activated Delayed Fluorescence Organic Electroluminescent Devices with Carriers Regulating Structure by Employing the Gadolinium(III) Complex as a Hole Trapper DOI
Guodong Sun, Y. Xu, Haoran Yang

et al.

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 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