Y‐Shaped Pyrene‐Based Aggregation‐Induced Emission Blue Emitters for High‐Performance OLED Devices

Jian-ping, Zeng; Qiu, Nuoling; Zhang, Jianyu; Wang, Xiaohui; Redshaw, Carl; Feng, Xing; Lam, Jacky W. Y.; Zhao, Zujin; Tang, Ben Zhong

doi:10.1002/adom.202200917

Cited by 34 publications

(17 citation statements)

References 32 publications

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“…15H). 165 The emission behaviors of Py-TPA and Py-2TPE compounds not only presented high luminous efficiencies (Fig. 15I) but also proved their AIE features (Fig.…”

Section: Electric Energy Conversion and Applicationsmentioning

confidence: 81%

“…Thirdly, for the EL device, the disordered structures of AIEgens in the solid state would restrict the electron–hole mobility, reducing the exciton utilization efficiency. In this regard, large conjugated polycyclic aromatic hydrocarbons could be introduced on the molecular skeleton 165 to tune the charge carriers of AIEgens in the emissive layer in pursuit of high efficiency. Finally, the organic HTMs of solar cells showed less stability compared to the inorganic HTMs in practical applications.…”

Section: Discussionmentioning

confidence: 99%

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Aggregation-induced emission materials: a platform for diverse energy transformation and applications

Yang

Zheng

et al. 2023

J. Mater. Chem. A

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“…15H). 165 The emission behaviors of Py-TPA and Py-2TPE compounds not only presented high luminous efficiencies (Fig. 15I) but also proved their AIE features (Fig.…”

Section: Electric Energy Conversion and Applicationsmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Aggregation-induced emission materials: a platform for diverse energy transformation and applications

Yang

Zheng

et al. 2023

J. Mater. Chem. A

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“…The maximum EQE of BPCPCHY was 3.39%, which was nearly 2.5 times higher than that of BPCP (1.38%) (Figure S19c). This unsatisfactory performance of doped OLEDs (EQE max < 5%) may be due to leakage of charge carriers and hole and electron injection mismatches, allowing carriers to enter the emission layer unevenly. , …”

Section: Resultsmentioning

confidence: 99%

“…This unsatisfactory performance of doped OLEDs (EQE max < 5%) may be due to leakage of charge carriers and hole and electron injection mismatches, allowing carriers to enter the emission layer unevenly. 57,58 To improve the electroluminescence performance of OLEDs, we further investigated the effect of the doped host materials and concentration. Thus, the benzoxazole-based doped OLEDs were improved through optimization of BPCP and BPCPCHY concentrations doped into mCP host materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Benzoxazole-Based Hybridized Local and Charge-Transfer Deep-Blue Emitters for Solution-Processable Organic Light-Emitting Diodes and the In fluences of Hexahydrophthalimido

Wang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Hybridized local and charge-transfer (HLCT) emitters have attracted extensive attention, but the insolubility and severe self-aggregation tendency restrict their applications in solution-processable organic light-emitting diodes (OLEDs), particularly deep-blue OLEDs. Herein, two novel benzoxazole-based solution-processable HLCT emitters (BPCP and BPCPCHY) are designed and synthesized, in which benzoxazole acts as an acceptor, carbazole acts as a donor, and hexahydrophthalimido (HP, with a large intramolecular torsion angle and spatial distortion characteristics) acts as a bulky modified end-group with weak electron-withdrawing effects. Both BPCP and BPCPCHY exhibit HLCT characteristics and emit near ultraviolet in toluene at 404 and 399 nm. Compared to the BPCP, the BPCPCHY solid shows much better thermal stability (T g, 187 vs 110 °C), higher oscillator strengths of the S1-to-S0 transition (0.5346 vs 0.4809), and faster k r (1.1 × 108 vs 7.5 × 107 s–1) and thus a much higher ΦPL in the neat film. The introduction of HP groups greatly suppresses the intra-/intermolecular charge-transfer effect and self-aggregation trends, and the BPCPCHY neat films placed in air for 3 months can still maintain an excellent amorphous morphology. The solution-processable deep-blue OLEDs utilizing BPCP and BPCPCHY achieved a CIEy of 0.06 with maximum external quantum efficiency (EQEmax) values of 7.19 and 8.53%, respectively, which are among the best results of the solution-processable deep-blue OLEDs based on the “hot exciton” mechanism. All of the above results indicate that benzoxazole is an excellent acceptor for constructing deep-blue HLCT materials, and the strategy of introducing HP as a modified end-group into an HLCT emitter provides a new perspective to develop solution-processable efficient deep-blue OLEDs with high morphological stability.

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“…36 According to the DFT calculations, although compounds 2 have a similar energy gap, 2c illustrated higher HOMO and LUMO levels compared to 2a and 2b, and 3, which may contribute to the easier hole injection and strength of the hole transport ability. 37,38 2.4. Two-Photon Absorption Properties.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis of Pyreno[2,1-b]furan Molecules with Two-Photon Absorption Properties

et al. 2022

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The development of large π-conjugated polycyclic heteroaromatic materials is of immense interest, both in the academic as well as the industrial community. Herein, we present the efficient one-pot synthesis of novel pyreno[2,1-b]furan molecules from a newly designed intermediate, which display intense green emission (505–516 nm) in solution and a large red shift emission (625–640 nm) in the solid state, because of strong π–π stacking. More interestingly, the compounds exhibit novel two-photon absorption (TPA) properties, and the TPA cross-section (δ) value was increased to 533 GM by regulating the electronic effects of the substituents of the pyreno[2,1-b]furan molecules. This study not only offers a facile strategy for constructing new pyrene-fused luminescence materials with two-photon absorption properties but also provides a new chemical intermediate that opens up a new pathway to advanced materials.

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Y‐Shaped Pyrene‐Based Aggregation‐Induced Emission Blue Emitters for High‐Performance OLED Devices

Abstract: Figure 1. The designed pyrene-based molecules Py-TPA, Py-2TPA, and Py-2TPE.

Cited by 34 publications

References 32 publications

Aggregation-induced emission materials: a platform for diverse energy transformation and applications

Aggregation-induced emission materials: a platform for diverse energy transformation and applications

Benzoxazole-Based Hybridized Local and Charge-Transfer Deep-Blue Emitters for Solution-Processable Organic Light-Emitting Diodes and the In fluences of Hexahydrophthalimido

One-Pot Synthesis of Pyreno[2,1-b]furan Molecules with Two-Photon Absorption Properties

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