Photoluminescence and electronic transition behaviors of single-stranded DNA,Physical Review E

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Photoluminescence and electronic transition behaviors of single-stranded DNA
Physical Review E ( IF 2.2 ) Pub Date : 2021-09-20 , DOI: 10.1103/physreve.104.034412
Qiujin Wang ₁ , Shuo Lin ₁ , Xuan Liu ₁ , Wen Xu _{1,

2,

3} , Yiming Xiao ₁ , Changneng Liang ₁ , Lan Ding ₁ , F M Peeters _{1,

4}

Affiliation

Due to the potential application of DNA for biophysics and optoelectronics, the electronic energy states and transitions of this genetic material have attracted a great deal of attention recently. However, the fluorescence and corresponding physical process of DNA under optical excitation with photon energies below ultraviolet are still not fully clear. In this work, we experimentally investigate the photoluminescence (PL) properties of single-stranded DNA (ssDNA) samples under near-ultraviolet (NUV) and visible excitations (

270 \sim 440

nm). Based on the dependence of the PL peak wavelength

(λ_{em})

upon the excitation wavelength

(λ_{ex})

, the PL behaviors of ssDNA can be approximately classified into two categories. In the relatively short excitation wavelength regime,

λ_{em}

is nearly constant due to exciton-like transitions associated with delocalized excitonic states and excimer states. In the relatively long excitation wavelength range, a linear relation of

λ_{em} = A λ_{ex} + B

with

A > 0

A < 0

can be observed, which comes from electronic transitions related to coupled vibrational-electronic levels. Moreover, the transition channels in different excitation wavelength regimes and the effects of strand length and base type can be analyzed on the basis of these results. These important findings not only can give a general description of the electronic energy states and transitional behaviors of ssDNA samples under NUV and visible excitations, but also can be the basis for the application of DNA in nanoelectronics and optoelectronics.

中文翻译：

单链 DNA 的光致发光和电子跃迁行为

由于 DNA 在生物物理学和光电子学方面的潜在应用，这种遗传物质的电子能量状态和跃迁最近引起了极大的关注。然而，在紫外以下光子能量的光激发下，DNA的荧光和相应的物理过程仍不完全清楚。在这项工作中，我们通过实验研究了单链 DNA (ssDNA) 样品在近紫外 (NUV) 和可见光激发下的光致发光 (PL) 特性。