Boron‐Dipyrromethene Emitters with Strengthened Rigidity and Restricted Scissoring Vibration for High‐Performance OLEDs With Deep‐Red Narrowband Emission DOI Open Access

Xuewei Nie,

Denghui Liu, Mengke Li

et al.

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

Published: Oct. 17, 2024

Abstract Organic light‐emitting diodes (OLEDs) using a simple solution‐processing approach have natural advantages in cost‐effective commercialization. However, solution‐processed deep‐red OLEDs are rarely reported due to the scarcity of efficient purely organic narrowband red emitters with commendable film‐forming capabilities. Herein, strategy is proposed develop molecules emission by expanding rigid conjugated frame block rotation α position boron‐dipyrromethene (BODIPY) core restricted twisting vibration. Furtherly, introducing moderate donor meso‐position BODIPY core, bathochromic‐shifted can be achieved without sacrificing narrow full‐width at half‐maximum (FWHM) increasing electron density whole molecule and repulsive force distal units suppress stretching/scissoring By employing developed BODIPY‐derived materials as terminal thermally activated delayed fluorescence material assistant host fabricate OLED devices, maximum external quantum efficiency 16.43% an peak 672 nm FWHM 28 nm. This work, according knowledge, represents best instance based on typical fluorescent emitters.

Language: Английский

Isomeric Pentagonal Fusion and π‐Expanding of Nitrogen/Carbonyl‐Containing Multi‐Resonant Emitters for High‐Performance and Narrowband Organic Electroluminescence DOI
Guoyun Meng, Jianping Zhou, Qi Wang

et al.

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

Published: Feb. 26, 2025

Abstract Embedding nitrogen/carbonyl (N/C═O) units into rigid heterocyclic aromatic hydrocarbons creates novel multi‐resonant thermally activated delayed fluorescence (MR‐TADF) molecules. Nevertheless, the intrinsic short‐range charge transfer (SRCT) characteristics of N/C═O derivatives, as exemplified by quinolino[3,2,1‐ de ]acridine‐5,9‐dione (QAO), result in broad spectral bandwidths, posing challenging for achieving deep blue emission. Herein, a pentagonal cyclization and isomeric expansion strategy aimed is proposed at modulating SRCT characters molecular symmetry to further narrow bandwidths regulate excited‐state energy levels. By fusing two 8 H ‐indolo[3,2,1‐ ]acridin‐8‐one (IAO) skeletons via central phenyl segment that cyclizes nitrogen atoms, proof‐of‐concept emitters with reduced widths are developed. These achieved wide color tuning range from (439 nm) pure green (520 exhibited 17–24 nm (≈0.11 eV). The corresponding electroluminescence devices demonstrated bright deep‐blue, blue, emissions linewidths. Notably, sensitized deep‐blue/blue incorporating mTIAO pTIAO exceptional external quantum efficiencies 29.6% 34.4%, respectively, representing most efficient blue‐light derivatives reported date. Furthermore, index mTIAO, measured (0.147, 0.063), aligns perfectly National Television System Committee standard (0.15, 0.06).

Language: Английский

Citations

3
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
Site-Specific Effects of Weak Electron-Donating/Withdrawing Groups on the Optoelectronic Properties of Carbonyl/Nitrogen MR-TADF Emitters DOI
Shangru Li,

Qiao-Er Wu,

Yan-Li Lian

et al.

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 142695 - 142695

Published: May 1, 2025

Language: Английский

Citations

0
Polymorphism and Phase Transformation Tuned Luminescence and Mechanistic Insights in Nonconventional Luminophores DOI Creative Commons
Anze Li, Zihao Zhao, Guangxin Yang

et al.

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

Published: Jan. 1, 2025

Polymorphism and phase transitions of gemini aliphatic quaternary ammonium salts provide viable routes for regulating luminescence elucidating the emission mechanism nonconventional luminophores.

Language: Английский

Citations

0
Versatile Spiral Donor‐Based Thermally Activated Delayed Fluorescence Materials for Highly Efficient TADF‐OLED and TSF‐OLED Applications DOI

Xilin Mu,

Deli Li,

Denghui Liu

et al.

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

Published: Oct. 9, 2024

Abstract Herein, a design strategy is explored for thermally activated delayed fluorescence (TADF) materials by employing the meta ‐linkage of spiral‐donors 10H‐spiro[acridine‐9,9'‐thioxanthene] (DspiroS) and 10',10'‐dimethyl‐10H,10'H‐spiro[acridine‐9,9'‐anthracene] (DspiroAc) to robust acceptor 2,4,6‐triphenyl‐1,3,5‐triazine (TRZ). Two distinct TADF materials, m‐DspiroS‐TRZ m‐DspiroAc‐TRZ, exhibiting unique photophysical properties performance characteristics were synthesized. Interestingly, even subtle modifications in molecular architecture can significantly impact organization their aggregated state, thereby governing inducing corresponding alterations photoelectric characteristics. Notably, m ‐DspiroS‐TRZ exhibits superior exciton dynamics data, achieving high photoluminescence quantum yield (PLQY) value up 95.9% rapid reverse intersystem crossing (RISC) rate (𝒌 𝑹𝑰𝑺𝑪 ) 1.0 × 10 6 s −1 . This positions as potentially excellent terminal emissive sensitizing host material, inspiring further exploration its applications electroluminescence. Consequently, organic light‐emitting device (TADF‐OLED) TADF‐sensitized (TSF‐OLED) based on have achieved maximum external efficiencies (EQEs) 31.8% 34.5%, respectively, demonstrating significant versatile potential ‐DspiroS‐TRZ.

Language: Английский

Citations

1
Boron‐Dipyrromethene Emitters with Strengthened Rigidity and Restricted Scissoring Vibration for High‐Performance OLEDs With Deep‐Red Narrowband Emission DOI Open Access

Xuewei Nie,

Denghui Liu, Mengke Li

et al.

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

Published: Oct. 17, 2024

Abstract Organic light‐emitting diodes (OLEDs) using a simple solution‐processing approach have natural advantages in cost‐effective commercialization. However, solution‐processed deep‐red OLEDs are rarely reported due to the scarcity of efficient purely organic narrowband red emitters with commendable film‐forming capabilities. Herein, strategy is proposed develop molecules emission by expanding rigid conjugated frame block rotation α position boron‐dipyrromethene (BODIPY) core restricted twisting vibration. Furtherly, introducing moderate donor meso‐position BODIPY core, bathochromic‐shifted can be achieved without sacrificing narrow full‐width at half‐maximum (FWHM) increasing electron density whole molecule and repulsive force distal units suppress stretching/scissoring By employing developed BODIPY‐derived materials as terminal thermally activated delayed fluorescence material assistant host fabricate OLED devices, maximum external quantum efficiency 16.43% an peak 672 nm FWHM 28 nm. This work, according knowledge, represents best instance based on typical fluorescent emitters.

Language: Английский

Citations

1