Deep-UV biological imaging by lanthanide ion molecular protection

Kumamoto, Yoshiaki; Fujita, Katsumasa; Smith, Nicholas I.; Kawata, Satoshi

doi:10.1364/boe.7.000158

Cited by 30 publications

(22 citation statements)

References 48 publications

(88 reference statements)

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“…For our Gr/Si UV photodetector, J ph and J dark are 12 μA cm −2 and 0.1 nA cm −2 (under vacuum) at zero-bias (selfpowered) mode, respectively, leading to R I = 0.12 A W −1 at 365 nm UV light. The responsivity and dark current density are comparable to the-state-of-art compound semiconductor Schottky photodetectors such as GaN (R I~0 .10 A W −1 , J dark~5 00 nA cm −2 ) and SiC (R I~0 .03 A W −1 , J dark~0 .25 nA cm −2 ) (see refs [1][2][3][4][5][6][7][8]. The dark current density of our Gr/Si photodetector is smaller than the typical metal-semiconductor Schottky photodetectors owing to the finite density of states of 2D materials and smaller electronic injection ratio from silicon to graphene, as compared with the traditional metal-semiconductor contact.…”

Section: Resultsmentioning

confidence: 77%

“…Ultraviolet (UV) photodetectors could find a wide range of applications, [1][2][3][4][5][6][7][8] such as environmental monitoring, 3 biological and chemical analysis, 4 flame detection, 5 astronomical studies, 8 internet-of-things sensors, 9 and missile detection. 10 Recently, wide band-gap (WBG) semiconductors (SiC, 11 GaN, 12 ZnO, 13 TiO X , 14 etc.)…”

Section: Introductionmentioning

confidence: 99%

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A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon?

et al. 2017

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We present a self-powered, high-performance graphene-enhanced ultraviolet silicon Schottky photodetector. Different from traditional transparent electrodes, such as indium tin oxides or ultra-thin metals, the unique ultraviolet absorption property of graphene leads to long carrier life time of hot electrons that can contribute to the photocurrent or potential carrier-multiplication. Our proposed structure boosts the internal quantum efficiency over 100%, approaching the upper-limit of silicon-based ultraviolet photodetector. In the near-ultraviolet and mid-ultraviolet spectral region, the proposed ultraviolet photodetector exhibits high performance at zero-biasing (self-powered) mode, including high photo-responsivity (0.2 A W −1 ), fast time response (5 ns), high specific detectivity (1.6 × 10 13 Jones), and internal quantum efficiency greater than 100%. Further, the photo-responsivity is larger than 0.14 A W −1 in wavelength range from 200 to 400 nm, comparable to that of state-of-the-art Si, GaN, SiC Schottky photodetectors. The photodetectors exhibit stable operations in the ambient condition even 2 years after fabrication, showing great potential in practical applications, such as wearable devices, communication, and "dissipation-less" remote sensor networks.

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Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon?

et al. 2017

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“…Recently, Kumamoto et al reported a brand new method for suppressing molecular degradation in cells under DUV irradiation . They used lanthanide although it is in general known as emissive materials .…”

Section: Photodamagementioning

confidence: 99%

“…They discussed mechanisms of the molecular protection effects of lanthanide ions . A lanthanide ion, such as Tb 3+ and Eu 3+ , accepts energy from a biomolecule excited at DUV light .…”

Section: Photodamagementioning

confidence: 99%

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Deep‐Ultraviolet Biomolecular Imaging and Analysis

Kumamoto

Taguchi

Kawata

2018

Advanced Optical Materials

Self Cite

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Deep‐ultraviolet light, 200–300 nm in wavelength, interacts with nucleic acids and proteins strongly compared to visible and infrared light. In this article, the interaction between deep‐ultraviolet photons and biomolecules is discussed. Especially, the absorption and autofluorescence of biomolecules by the deep‐ultraviolet excitation are examined. Applications of deep‐ultraviolet absorption and autofluorescence to label‐free biomolecular imaging and analysis of cells and tissues are shown. Resonant Raman scattering at nucleotide bases and aromatic amino acids as another important topic of deep‐ultraviolet photonics is reviewed in biomolecular imaging and analysis. The discussion extends to the recent progress in the development of deep‐ultraviolet microscopes as well as a variety of deep‐ultraviolet optical devices such as light sources, detectors, and objectives. The issue of photodamage due to deep‐ultraviolet irradiation on cells and tissues is also discussed. It has been recently suppressed with use of lanthanide ions. The experimental results of the photodamage suppression are shown. For surface‐enhanced resonant Raman scattering, autofluorescence enhancement, and tip‐enhanced resonant Raman scattering microscopy, plasmonic materials applicable in the deep‐ultraviolet range are discussed.

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The Interaction between Quantum Dots and Graphene: The Applications in Graphene‐Based Solar Cells and Photodetectors

Feng

et al. 2018

Adv Funct Materials

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Graphene with a series of neoteric electronic and optical properties is an intriguing building block for optoelectronic devices. Over the past decade, graphene‐based solar cells (SCs) and photodetectors (PDs) which can convert light signals to electrical signals have received burgeoning exploration. However, limited light absorption hampers the performance of these devices. Quantum dots (QDs) possess a strong confinement effect, a large exciton energy, and long exciton lifetime, enhancing the interaction between incident light and graphene. Especially, as the density of states near the Dirac point of graphene is ultralow, it is easy to modify the Fermi level of graphene by inserting quantum dots at the interface between graphene and light, thereby enhancing the performance of graphene‐based optoelectronic devices. The characteristics of QDs and crucial physical mechanisms of the interaction and energy transfer in QDs/graphene nanohybrids are systematically addressed. The factors influencing the efficiency of energy transfer are also analyzed quantitatively. Moreover, the experimental process of QD‐enhanced technologies for SCs, photoconductors, phototransistors, and photodiode PDs is reviewed. Eventually, a conclusion is given and the remaining challenges and future development for QDs/2D materials hybrid systems is discussed. Possible steps toward large‐scale commercial applications and integration into optoelectronic networks are suggested.

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Deep-UV biological imaging by lanthanide ion molecular protection

Cited by 30 publications

References 48 publications

A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon?

A self-powered high-performance graphene/silicon ultraviolet photodetector with ultra-shallow junction: breaking the limit of silicon?

Deep‐Ultraviolet Biomolecular Imaging and Analysis

The Interaction between Quantum Dots and Graphene: The Applications in Graphene‐Based Solar Cells and Photodetectors

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