Ultrapure blue organic light-emitting diodes exhibiting 13 nm full width at half-maximum

Liu, Tiangeng; Cheng, Chu; Lou, Weiwei; Deng, Chao; Liu, Junyuan; Wang, Dan; Tsuboi, Taijū; Zhang, Qisheng

doi:10.1039/d2tc00921h

Cited by 21 publications

(19 citation statements)

References 27 publications

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“…Zhang et al introduced peripheral mesityl and 3,5-di-tert-butylphenyl groups to the DICz skeleton to suppress solid state aggregation (Figure 6). [18] Key intermediate was synthesized from condensation of chlorine substituted indole with o-bromo-phenylaldehyde followed by intramolecular copper-catalyzed Ullmann coupling reaction. The resulted chlorine-substituted DICz underwent palladium-catalyzed Suzu-ki Miyaura coupling reaction to give mMes2DICz and mtPh2DICz, which displayed bright narrowband deep blue emission in toluene (λ PL = 445/457 nm, FWHM = 10/13 nm, Φ PL = 99/99 %).…”

Section: Resultsmentioning

confidence: 99%

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Indolocarbazole‐Based Multiple‐Resonance Molecules: an Emerging Class of Full‐Color, Narrowband Emitters for Organic Light‐Emitting Diodes

Wang

Duan

Zhang

2023

Chemistry A European J

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Narrowband emitters based on the multiple resonance (MR) effect have shown great promises for applications in high-definition displays. Though most reported MR emitters adopt the boron-and nitrogen-doped triangulenelike skeleton following the design of the DABNA series, MR materials with the nitrogen-only indolocarbazole structures have recently emerged and demonstrated good color tuna-bility from violet to deep red and impressive electroluminescence performances in terms of both efficiency and stability. Herein, we will summarize indolocarbazole-based MR materials in recent reports, with emphasis on their molecular design, synthesis, photophysical and electroluminescence properties as well as some future research directions to unlock the full potential of this fascinating class of materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Indolocarbazole‐Based Multiple‐Resonance Molecules: an Emerging Class of Full‐Color, Narrowband Emitters for Organic Light‐Emitting Diodes

Wang

Duan

Zhang

2023

Chemistry A European J

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“…This pioneering work has prompted researchers to further explore IDCz-based MR emitters. [122][123][124][125][126][127][128][129] This section provides an overview of the latest IDCz-based MR-TADF materials (Figure 10 and Table 5).…”

Section: Indolocarbazole (Idcz)-based Mr-tadf Materialsmentioning

confidence: 99%

“…Furthermore, research on ICz-based MR emitters with high emission color purity, even without TADF features, is being actively conducted by several research groups. [123,[126][127][128][129]…”

Section: Indolocarbazole (Idcz)-based Mr-tadf Materialsmentioning

confidence: 99%

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Kim

Yasuda

2022

Advanced Optical Materials

249

131

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Organic thermally activated delayed fluorescence (TADF) materials have attracted significant research interest in the field of organic electronics because of their inherent advantage of 100% exciton utilization capability in organic light‐emitting diodes (OLEDs) without the use of noble metals. However, despite their high internal electroluminescence quantum efficiencies approaching unity, broad emission spectra with sizable full width at half maxima (FWHM; 60–100 nm) present a critical issue that must be solved for their application in ultrahigh‐definition OLED displays. Recently, a new paradigm of TADF materials featuring the multiple resonance (MR) effect based on heteroatom‐doped polycyclic aromatic frameworks, referred to as MR‐TADF materials, has emerged and garnered considerable research interest owing to their remarkable features of efficient narrowband emissions with extremely small FWHMs (≤30 nm). Currently, MR‐TADF materials occupy a prominent position in the cutting‐edge research on organic light‐emitting materials from both chemical and physical perspectives. This review article focuses on recent progress in narrowband emissive MR‐TADF systems from the perspective of molecular design, photophysical properties, and electroluminescence performance in OLEDs. The current status and future prospects of this advanced material technology are discussed comprehensively.

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Rigidity‐Enhanced Narrowband Iridium(III) Complexes with Finely‐Optimized Emission Spectra for Efficient Pure‐Red Electroluminescence

Yan,

Mao,

Liu

et al. 2024

Adv Funct Materials

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Attaining phosphorescent materials with narrowband emission is crucial for advancing wide‐color‐gamut organic light‐emitting diode (OLED). Herein, a rigid modification strategy is introduced for iridium(III) complexes to achieve the narrowband red emission with negligible 0–1 peak. By introducing the rigid indolo[3,2,1‐jk]carbazole (ICz) into the cyclometalated ligand, Ir(III) complexes, ICziq‐Ir and ICzqz‐Ir, exhibit pure red phosphorescence with emission peaks at 608 and 613 nm and full widths at half‐maximum (FWHMs) of 37 and 38 nm (0.12 and 0.13 eV) in toluene, respectively. Furthermore, the specific site modification of ICzqz‐Ir greatly suppresses the high‐frequency vibration of the structure, resulting in the narrowband photoluminescent spectrum close to the Gaussian distribution with superior color purity. The OLEDs utilizing ICziq‐Ir and ICzqz‐Ir demonstrate maximum external quantum efficiencies of 21.4 and 17.8% as well as mild efficiency roll‐off. Remarkably, the electroluminescence spectra exhibit similar narrowband red emission with FWHMs of 37 and 43 nm and CIE coordinates of (0.65, 0.35) and (0.66, 0.34), attesting to the excellent color purity of the phosphorescent OLEDs.

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Ultrapure blue organic light-emitting diodes exhibiting 13 nm full width at half-maximum

Abstract: Introducing two mesityl groups to the rigid and planar molecule dibenzo[2,3:5,6]pyrrolizino[1,7-bc]indolo[1,2,3-lm]carbazole successfully suppressed the aggregation-induced redshift and broadening in the emission spectra, enabling the new emitter mMes2DICz to be a...

Cited by 21 publications

References 27 publications

Indolocarbazole‐Based Multiple‐Resonance Molecules: an Emerging Class of Full‐Color, Narrowband Emitters for Organic Light‐Emitting Diodes

Indolocarbazole‐Based Multiple‐Resonance Molecules: an Emerging Class of Full‐Color, Narrowband Emitters for Organic Light‐Emitting Diodes

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Rigidity‐Enhanced Narrowband Iridium(III) Complexes with Finely‐Optimized Emission Spectra for Efficient Pure‐Red Electroluminescence

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