Narrowband room temperature phosphorescence of closed-loop molecules through the multiple resonance effect

Xiaokang Yao, Yuxin Li, Huifang Shi, Ze Yu, Beishen Wu, Zixing Zhou, Chifeng Zhou, Xifang Zheng, Mengting Tang, Xiao Wang, Huili Ma, Zhengong Meng, Wei Huang and Zhongfu An ()
Additional contact information
Xiaokang Yao: Nanjing Tech University (NanjingTech)
Yuxin Li: Nanjing Tech University (NanjingTech)
Huifang Shi: Nanjing Tech University (NanjingTech)
Ze Yu: Nanjing Tech University (NanjingTech)
Beishen Wu: Nanjing Tech University (NanjingTech)
Zixing Zhou: Xiamen University
Chifeng Zhou: Nanjing Tech University (NanjingTech)
Xifang Zheng: Nanjing Tech University (NanjingTech)
Mengting Tang: Nanjing Tech University (NanjingTech)
Xiao Wang: Xiamen University
Huili Ma: Nanjing Tech University (NanjingTech)
Zhengong Meng: Nanjing Tech University (NanjingTech)
Wei Huang: Nanjing Tech University (NanjingTech)
Zhongfu An: Nanjing Tech University (NanjingTech)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Luminescent materials with narrowband emission show great potential for diverse applications in optoelectronics. Purely organic phosphors with room-temperature phosphorescence (RTP) have made significant success in rationally manipulating quantum efficiency, lifetimes, and colour gamut in the past years, but there is limited attention on the purity of the RTP colours. Herein we report a series of closed-loop molecules with narrowband phosphorescence by multiple resonance effect, which significantly improves the colour purity of RTP. Phosphors show narrowband phosphorescence with full width at half maxima (FWHM) of 30 nm after doping into a rigid benzophenone matrix under ambient conditions, of which the RTP efficiency reaches 51.8%. At 77 K, the FWHM of phosphorescence is only 11 nm. Meanwhile, the colour of narrowband RTP can be tuned from sky blue to green with the modification of methyl groups. Additionally, the potential applications in X-ray imaging and display are demonstrated. This work not only outlines a design principle for developing narrowband RTP materials but also makes a major step forward extending the potential applications of narrowband luminescent materials in optoelectronics.

Date: 2024
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DOI: 10.1038/s41467-024-48856-3

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