Efficient Ultra‐Narrowband OLEDs Based on Carbazole‐Fused Dual‐Boron Embedded Multi‐Resonance Thermally Activated Delayed Fluorescence Materials DOI
Jiajun Hu, Yi Wei,

Xiang‐Zhi Wang

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(15)

Published: Jan. 2, 2024

Abstract The development of efficient multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials with ultra‐narrowband emission presents an ongoing challenge. In this work, a carbazole‐fused dual‐boron embedded MR‐TADF framework is proposed, achieving three emitters, CFDBO, CFDBA, and CFDBCz, via one‐shot borylation very high yields over 70%. emitters display blue peaks ranging from 452 to 479 nm small full width at half maximum (FWHM) values only 16–18 in dilute toluene solutions. Furthermore, the organic light‐emitting diode (OLED) incorporating CFDBO exhibits pure‐blue peak 460 Commission International de l'Eclairage coordinates (0.14, 0.12). Meanwhile, OLEDs CFDBA/CFDBCz demonstrate remarkable performances external quantum efficiencies 30.9%/32.4% exceptionally slender FWHM 21/22 nm, representing outstanding among reported materials.

Language: Английский

Organoboron-based multiple-resonance emitters: synthesis, structure–property correlations, and prospects DOI Creative Commons
Masashi Mamada, Masahiro Hayakawa, Junki Ochi

et al.

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1624 - 1692

Published: Jan. 1, 2024

This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot and late-stage functionalisation, explores material structure–photophysical property correlations.

Language: Английский

Citations

117
RGB Thermally Activated Delayed Fluorescence Emitters for Organic Light‐Emitting Diodes toward Realizing the BT.2020 Standard DOI Creative Commons
Xiao‐Chun Fan,

Xiaoyao Hao,

Feng Huang

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(28)

Published: Aug. 16, 2023

Abstract With the surging demand for ultra‐high‐resolution displays, International Telecommunication Union (ITU) announce next‐generation color gamut standard, named ITU‐R Recommendation BT.2020, which not only sets a seductive but challenging milestone display technologies also urges researchers to recognize importance of coordinates. Organic light‐emitting diodes (OLEDs) are an important technology in current daily life, they face challenges approaching BT.2020 standard. Thermally activated delayed fluorescence (TADF) emitters have bright prospects OLEDs because possess 100% theoretical exciton utilization. Thus, development TADF emitting primary red (R), green and blue (B) emission is great significance. Here, comprehensive overview latest advancements that exhibit Commission Internationale de l'Éclairage (CIE) coordinates surpassing National Television System Committee (NTSC) standards presented. Rational strategies molecular designs, as well resulting photophysical properties OLED performances, discussed elucidate underlying mechanisms shifting CIE both donor‐acceptor multiple resonance (MR) typed toward Finally, realization wide‐color‐gamut standard this research area provided.

Language: Английский

Citations

69
B‐N Covalent Bond Embedded Double Hetero‐[n]helicenes for Pure Red Narrowband Circularly Polarized Electroluminescence with High Efficiency and Stability DOI
Guoyun Meng, Jianping Zhou, Xu‐Shuang Han

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(5)

Published: Sept. 12, 2023

Chiral B/N embedded multi-resonance (MR) emitters open a new paradigm of circularly polarized (CP) organic light-emitting diodes (OLEDs) owing to their unique narrowband spectra. However, pure-red CP-MR and devices remain exclusive in literature. Herein, by introducing B-N covalent bond lower the electron-withdrawing ability para-positioned B-π-B motif, first pair double hetero-[n]helicenes (n = 6 7) emitter peaking 617 nm with small full-width at half-maximum 38 high photoluminescence quantum yield ≈100% toluene is developed. The intense mirror-image CP light produced enantiomers characterized dissymmetry factors (g

Language: Английский

Citations

57
Nitrogen‐Embedding Strategy for Short‐Range Charge Transfer Excited States and Efficient Narrowband Deep‐Blue Organic Light Emitting Diodes DOI
Xinliang Cai, Yue Pan, Chenglong Li

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(35)

Published: June 3, 2024

The development of deep-blue organic light-emitting diodes (OLEDs) featuring high efficiency and narrowband emission is great importance for ultrahigh-definition displays with wide color gamut. Herein, based on the nitrogen-embedding strategy modifying short range charge transfer excited state energies multi-resonance (MR) thermally activated delayed fluorescence (TADF) emitters, we introduce one or two nitrogen atoms into central benzene ring a versatile boron-embedded 1,3-bis(carbazol-9-yl)benzene skeleton. This approach resulted in stabilization highest occupied molecular orbital energy levels formation intramolecular hydrogen bonds, thus systematic hypsochromic shifts narrowing spectra. In toluene solution, heterocyclic-based MR-TADF molecules, Py-BN Pm-BN, exhibit emissions photoluminescence quantum yields 93 % 94 %, narrow full width at half maximum 14 13 nm, respectively. A hyperfluorescent OLED exhibited external 27.7 desired purity Commission Internationale de L'Eclairage (CIE) coordinates (0.150, 0.052). These results demonstrate significant potential deep blue emitters.

Language: Английский

Citations

16
Sulfur-locked multiple resonance emitters for high performance orange-red/deep-red OLEDs DOI Creative Commons

Yexuan Pu,

Jin Qian, Yuewei Zhang

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Language: Английский

Citations

2
Combining Carbazole Building Blocks and ν‐DABNA Heteroatom Alignment for a Double Boron‐Embedded MR‐TADF Emitter with Improved Performance DOI
Feng Huang, Xiao‐Chun Fan,

Ying‐Chun Cheng

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(32)

Published: June 13, 2023

Building blocks and heteroatom alignments are two determining factors in designing multiple resonance (MR)-type thermally activated delayed fluorescence (TADF) emitters. Carbazole-fused MR emitters, represented by CzBN derivatives, the of ν-DABNA star series MR-TADF emitters that show impressive performances from aspects building alignments, respectively. Herein, a novel analog, Π-CzBN, featuring alignment is developed via facile one-shot lithium-free borylation. Π-CzBN exhibits superior photophysical properties with photoluminescence quantum yield close to 100 % narrowband sky blue emission full width at half maximum (FWHM) 16 nm/85 meV. It also gives efficient TADF small singlet-triplet energy offset 40 meV fast reverse intersystem crossing rate 2.9×105 s-1 . The optimized OLED using as emitter achieves an exceptional external efficiency 39.3 low roll-off 20 1000 cd m-2 495 nm FWHM 21 nm/106 meV, making it one best reported devices based on comprehensive performance.

Language: Английский

Citations

29
Narrowband Near‐Infrared Multiple‐Resonance Thermally Activated Delayed Fluorescence Emitters towards High‐Performance and Stable Organic Light‐Emitting Diodes DOI
Tao Hua, Nengquan Li, Zhongyan Huang

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(7)

Published: Dec. 27, 2023

Multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials are highly coveted for their high efficiency and narrowband emission in organic light-emitting diodes (OLEDs). Nevertheless, the development of near-infrared (NIR) MR-TADF emitters remains a formidable challenge. In this study, we design two new NIR emitters, PXZ-R-BN BCz-R-BN, by embedding 10H-phenoxazine (PXZ) 7H-dibenzo[c,g]carbazole (BCz) fragments to increase electron-donating ability or extending π-conjugation on framework para-boron fusing polycyclic aromatic hydrocarbons (PAHs). Both compounds emit region, with full-width at half-maximum (FWHM) 49 nm (0.13 eV) 43 (0.11 BCz-R-BN toluene. To sensitize OLEDs, platinum complex, Pt-1, is designed as sensitizer. The PXZ-R-BN-based sensitized OLEDs achieve maximum external quantum (EQE

Language: Английский

Citations

29
Tailored Design of π‐Extended Multi‐Resonance Organoboron using Indolo[3,2‐b]Indole as a Multi‐Nitrogen Bridge DOI

Tianjiao Fan,

Senqiang Zhu, Xudong Cao

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(48)

Published: Oct. 9, 2023

Extending the π-skeletons of multi-resonance (MR) organoboron emitters can feasibly modulate their optoelectronic properties. Here, we first adopt indolo[3,2-b]indole (32bID) segment as a multi-nitrogen bridge and develop high-efficiency π-extended narrowband green emitter. This moiety establishes not only high-yield one-shot multiple Bora-Friedel-Crafts reaction towards MR skeleton, but compact N-ethylene-N motif for red-shifted emission. An emission peak at 524 nm, small full width half maximum 25 nm high photoluminescence quantum yield 96 % are concurrently obtained in dilute toluene. The extended molecular plane also results large horizontal emitting dipole orientation ratio 87 %. A external efficiency (EQE) 36.6 power 135.2 lm/W thereafter recorded corresponding device, allowing low roll-off with EQEs 34.5 28.1 luminance 1,000 cd/m2 10,000 , respectively.

Language: Английский

Citations

26
Boron‐Dipyrromethene‐Based Fluorescent Emitters Enable High‐Performance Narrowband Red Organic Light‐Emitting Diodes DOI
Jiahui Liu, Junjie Liu, Haoyuan Li

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(31)

Published: June 8, 2023

Narrowband organic light-emitting diodes (OLEDs) are receiving significant attention and have demonstrated impressive performance in blue green OLEDs. However, developing high-performance narrowband red OLEDs remains a highly desired yet challenging task. Herein, we developed fluorescent emitters by utilizing boron-dipyrromethene (BODIPY) skeleton combination with methyl-shield strategy. These exhibit small full-width at half-maxima (FWHM) ranging from 21 nm (0.068 eV) to 25 (0.081 high photoluminescence quantum yields (ΦPL ) 88.5 % 99.0 toluene solution. Using BODIPY-based luminescent materials as emitters, been assembled external efficiency 18.3 623 21.1 604 nm. This work represents, our knowledge, the first successful case of achieving NTSC pure-red Commission Internationale de l'Éclairage (CIE) coordinates [0.67, 0.33] based on conventional emitters.

Language: Английский

Citations

24
Precisely regulating the double-boron-based multi-resonance framework towards pure-red emitters: high-performance OLEDs with CIE coordinates fully satisfying the BT. 2020 standard DOI
Yang Zou,

Jiawei He,

Nengquan Li

et al.

Materials Horizons, Journal Year: 2023, Volume and Issue: 10(9), P. 3712 - 3718

Published: Jan. 1, 2023

Pure-red multi-resonance emitters are designed through precisely regulating the double-boron-based framework. The resulting OLEDs exhibit high efficiency and ideal CIE coordinates that fully satisfy BT. 2020 standard.

Language: Английский

Citations

24