A direct observation of up-converted room-temperature phosphorescence in an anti-Kasha dopant-matrix system

Jiuyang Li, Xun Li, Guangming Wang, Xuepu Wang, Minjian Wu, Jiahui Liu and Kaka Zhang ()
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Jiuyang Li: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Xun Li: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Guangming Wang: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Xuepu Wang: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Minjian Wu: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Jiahui Liu: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Kaka Zhang: University of Chinese Academy of Sciences, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract It is common sense that emission maxima of phosphorescence spectra (λP) are longer than those of fluorescence spectra (λF). Here we report a serendipitous finding of up-converted room-temperature phosphorescence (RTP) with λP 0.1 s upon doping benzophenone-containing difluoroboron β-diketonate (BPBF2) into phenyl benzoate matrices. The up-converted RTP is originated from BPBF2’s Tn (n ≥ 2) states which show typical 3n-π* characters from benzophenone moieties. Detailed studies reveal that, upon intersystem crossing from BPBF2’s S1 states of charge transfer characters, the resultant T1 and Tn states build T1-to-Tn equilibrium. Because of their 3n-π* characters, the Tn states possess large phosphorescence rates that can strongly compete RTP(T1) to directly emit RTP(Tn) which violates Kasha’s rule. The direct observation of up-converted RTP provides deep understanding of triplet excited state dynamics and opens an intriguing pathway to devise visible-light-excitable deep-blue afterglow emitters, as well as stimuli-responsive afterglow materials.

Date: 2023
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DOI: 10.1038/s41467-023-37662-y

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