Continuous tuning of persistent luminescence wavelength by intermediate-phase engineering in inorganic crystals

Xin Zhang, Hao Suo, Yang Guo, Jiangkun Chen, Yu Wang, Xiaohe Wei, Weilin Zheng, Shuohan Li and Feng Wang ()
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Xin Zhang: City University of Hong Kong
Hao Suo: City University of Hong Kong
Yang Guo: City University of Hong Kong
Jiangkun Chen: City University of Hong Kong
Yu Wang: Hebei University
Xiaohe Wei: City University of Hong Kong
Weilin Zheng: City University of Hong Kong
Shuohan Li: City University of Hong Kong
Feng Wang: City University of Hong Kong

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

Abstract: Abstract Multicolor tuning of persistent luminescence has been extensively studied by deliberately integrating various luminescent units, known as activators or chromophores, into certain host compounds. However, it remains a formidable challenge to fine-tune the persistent luminescence spectra either in organic materials, such as small molecules, polymers, metal-organic complexes and carbon dots, or in doped inorganic crystals. Herein, we present a strategy to delicately control the persistent luminescence wavelength by engineering sub-bandgap donor-acceptor states in a series of single-phase Ca(Sr)ZnOS crystals. The persistent luminescence emission peak can be quasi-linearly tuned across a broad wavelength range (500–630 nm) as a function of Sr/Ca ratio, achieving a precision down to ~5 nm. Theoretical calculations reveal that the persistent luminescence wavelength fine-tuning stems from constantly lowered donor levels accompanying the modified band structure by Sr alloying. Besides, our experimental results show that these crystals exhibit a high initial luminance of 5.36 cd m−2 at 5 sec after charging and a maximum persistent luminescence duration of 6 h. The superior, color-tunable persistent luminescence enables a rapid, programable patterning technique for high-throughput optical encryption.

Date: 2024
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DOI: 10.1038/s41467-024-51180-5

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