Linear Annulation Engineering of Indolocarbazole Multiple Resonance Emitter to Overcome Efficiency‐Stability‐Color Purity Trilemma in Deep‐Blue OLEDs DOI
Qian Wang, Hai Zhang, Jianping Zhou

et al.

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

Published: May 9, 2025

Abstract Deep‐blue emitters for organic light‐emitting diodes (OLEDs) still confront the critical challenge of balancing high efficiency, operational stability, and color purity, particularly ones with peak wavelengths ( λ max ) ≤ 460 nm. Here, study demonstrates deep‐blue devices featuring ultrapure emission = 458 nm, full‐width at half‐maximum 19 nm), maximum external quantum efficiency 34.3% small roll‐off (26.9% 1 000 cd m − 2 ; 20.9% 5 ), long LT80 (time to 80% initial luminance) 101 hours 1,000 , being one longest lifetime among OLEDs nm EQE >20%. This breakthrough stems from an indolocarbazole narrowband emitter employing a linear annulation strategy, which not only narrows spectral bandwidth while red‐shifting through multiple resonance framework extension, but also energetically dynamically enhances device longevity via triplet energy reduction. Furthermore, strategic integration steric hindrance on emitting backbone suppresses intermolecular interactions directs reactivity pathways. concurrently achieves 456 FWHM 15 photoluminescence (PL) yield 98% in dilute toluene. The work highlights engineering as potential approach resolve efficiency‐stability‐color purity trilemma OLEDs.

Language: Английский

Design of new first and fifth generation OLED emitters by doping 12,12-dimethyl-7-phenyl-7,12-dihydrobenzo[a]acridine-3-carbonitrile (BACN): DFT study DOI

P.F. Bissi Nyandou,

P. Noudem,

C. D. D. Mveme

et al.

Synthetic Metals, Journal Year: 2025, Volume and Issue: unknown, P. 117879 - 117879

Published: April 1, 2025

Language: Английский

Citations

0
Overcrowded steric engineering of through-space interactions for anti-quenching multi-resonance TADF materials DOI
Ru‐Jia Wang,

Fan Zheng,

Jie Hu

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163327 - 163327

Published: May 1, 2025

Language: Английский

Citations

0
High‐Efficiency Deep Blue OLEDs With Hot Exciton Materials as Emitters and Hosts DOI

Lveting Zhang,

Dehua Hu,

Shipan Wang

et al.

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

Published: May 2, 2025

Abstract Achieving highly efficient deep‐blue emissive materials with Commission Internationale de l'Eclairage (CIE) coordinates approaching BT.2020 standard remains a significant challenge in organic light‐emitting diodes (OLEDs). Here, three novel deep blue emitters (namely PAF, PAFN, and PAPF) are developed through twisting substitution of anthracene phenanthridazole unit dibenzofuran derivatives. All demonstrate hot exciton characteristics, featured by reverse intersystem crossing from high‐lying triplet states to singlet states, which is conducive harvesting the excitons OLED applications. Detailed photophysical analyses indicate that lowest state these localized excited state, ensuring emission. The non‐doped based on PAPF exhibited emission maximum external quantum efficiency (EQE max ) 8.6% CIE (0.150, 0.057). binary doped as host organoboron‐based fluorophore guest achieved an EQE 10%, narrow full width at half 18 nm. It also worth noting exceptional minimal roll‐off = 9.0% 1000 cd m − 2 realized current host‐guest system. This study provides valuable insights into developing wide‐bandgap for stable, high‐performance OLEDs.

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
Linear Annulation Engineering of Indolocarbazole Multiple Resonance Emitter to Overcome Efficiency‐Stability‐Color Purity Trilemma in Deep‐Blue OLEDs DOI
Qian Wang, Hai Zhang, Jianping Zhou

et al.

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

Published: May 9, 2025

Abstract Deep‐blue emitters for organic light‐emitting diodes (OLEDs) still confront the critical challenge of balancing high efficiency, operational stability, and color purity, particularly ones with peak wavelengths ( λ max ) ≤ 460 nm. Here, study demonstrates deep‐blue devices featuring ultrapure emission = 458 nm, full‐width at half‐maximum 19 nm), maximum external quantum efficiency 34.3% small roll‐off (26.9% 1 000 cd m − 2 ; 20.9% 5 ), long LT80 (time to 80% initial luminance) 101 hours 1,000 , being one longest lifetime among OLEDs nm EQE >20%. This breakthrough stems from an indolocarbazole narrowband emitter employing a linear annulation strategy, which not only narrows spectral bandwidth while red‐shifting through multiple resonance framework extension, but also energetically dynamically enhances device longevity via triplet energy reduction. Furthermore, strategic integration steric hindrance on emitting backbone suppresses intermolecular interactions directs reactivity pathways. concurrently achieves 456 FWHM 15 photoluminescence (PL) yield 98% in dilute toluene. The work highlights engineering as potential approach resolve efficiency‐stability‐color purity trilemma OLEDs.

Language: Английский

Citations

0