New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs

Wu, Zhiwei; Zou, Peng; Chen, Ziwei; Tang, Ben Zhong; Zhao, Zujin

doi:10.3390/ma18174000

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New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs

by

Zhiwei Wu

¹,

Peng Zou

¹,

Ziwei Chen

¹,

Ben Zhong Tang

² and

Zujin Zhao

^1,*

¹

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China

²

Guangdong Basic Research Center of Excellence for Aggregate Science, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518172, China

^*

Author to whom correspondence should be addressed.

Materials 2025, 18(17), 4000; https://doi.org/10.3390/ma18174000

Submission received: 12 July 2025 / Revised: 15 August 2025 / Accepted: 20 August 2025 / Published: 26 August 2025

(This article belongs to the Special Issue Enhancement Strategies for High External Quantum Efficiency of Organic Light Emitting Diodes (OLEDs) and the Analyses)

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Abstract

Advances in OLED display technology have increased the demand for high-performance luminescent materials, yet efficient red emitters with narrow emission spectra remain rare. Here, two new polycyclic compounds (O-QA and S-QA) are designed by incorporating oxygen/sulfur into a carbonyl/nitrogen skeleton. Photophysical and theoretical studies reveal their hybridized local and charge-transfer state characteristics. In toluene, O-QA and S-QA show photoluminescence peaks at 586/579 nm with narrow emission spectra, while doped films exhibit strong red emissions peaking at 598/600 nm with high PL quantum yields of 67%/60%. The OLEDs using these emitters achieve red electroluminescence (EL) peaks at 598/602 nm, and attain maximum external quantum efficiencies of 7.36%/14.54%. This work may provide guidance for the development of narrow-spectrum red emitters based on carbonyl/nitrogen frameworks.

Keywords: organic light-emitting diodes; electroluminescence; carbonyl/nitrogen skeleton; hybridized local and charge-transfer state; narrow emission spectrum

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MDPI and ACS Style

Wu, Z.; Zou, P.; Chen, Z.; Tang, B.Z.; Zhao, Z. New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs. Materials 2025, 18, 4000. https://doi.org/10.3390/ma18174000

AMA Style

Wu Z, Zou P, Chen Z, Tang BZ, Zhao Z. New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs. Materials. 2025; 18(17):4000. https://doi.org/10.3390/ma18174000

Chicago/Turabian Style

Wu, Zhiwei, Peng Zou, Ziwei Chen, Ben Zhong Tang, and Zujin Zhao. 2025. "New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs" Materials 18, no. 17: 4000. https://doi.org/10.3390/ma18174000

APA Style

Wu, Z., Zou, P., Chen, Z., Tang, B. Z., & Zhao, Z. (2025). New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs. Materials, 18(17), 4000. https://doi.org/10.3390/ma18174000

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New Polycyclic Red Luminescent Compounds Based on Carbonyl/Nitrogen Skeleton for Efficient Narrow-Spectrum OLEDs

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