Far‐UV‐Excited Luminescence of Nitrogen‐Vacancy Centers: Evidence for Diamonds in Space

Lu, Hsiao‐Chi; Peng, Yu‐Chain; Chou, Sheng‐Lung; Lo, Jen‐Iu; Cheng, Bing‐Ming; Chang, Huan‐Cheng

doi:10.1002/ange.201707389

Cited by 7 publications

(17 citation statements)

References 41 publications

(22 reference statements)

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“…Continuous-wave green (GR; 532 nm) and near-infrared (NIR; 1064 nm) diode lasers were launched from both ends of the nanofiber. The NVCs exhibit absorption at the GR region but not at the NIR region ( 28 , 29 ). Furthermore, we introduce a weak red laser in the fiber as a probe light (690 nm, 0.1 mW) to monitor the motion of the NDs, which was recorded by an optical microscope equipped with a charge-coupled device (CCD) camera.…”

Section: Resultsmentioning

confidence: 99%

Optical selection and sorting of nanoparticles according to quantum mechanical properties

et al. 2021

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Optical trapping and manipulation have been widely applied to biological systems, and their cutting-edge techniques are creating current trends in nanomaterial sciences. The resonant absorption of materials induces not only the energy transfer from photons to quantum mechanical motion of electrons but also the momentum transfer between them, resulting in dissipative optical forces that drive the macroscopic mechanical motion of the particles. However, optical manipulation, according to the quantum mechanical properties of individual nanoparticles, is still challenging. Here, we demonstrate selective transportation of nanodiamonds with and without nitrogen-vacancy centers by balancing resonant absorption and scattering forces induced by two different-colored lasers counterpropagating along a nanofiber. Furthermore, we propose a methodology for precisely determining the absorption cross sections for single nanoparticles by monitoring the optically driven motion, which is called as “optical force spectroscopy.” This method provides a novel direction in optical manipulation technology toward development of functional nanomaterials and quantum devices.

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Section: Resultsmentioning

confidence: 99%

Optical selection and sorting of nanoparticles according to quantum mechanical properties

et al. 2021

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“…In contrast, the ZPL of NV − was barely detectable at 638 nm, indicating that the originally present NV − centers had been photoionized to form NV 0 during the interband excitation that created electron−hole pairs, which were subsequently recombined upon relaxation. As discussed in our previous work, 21 the energy (∼5.5 eV) released from the electron−hole recombination is sufficient to ionize the negatively charged defects to form electronically excited neutral centers, a process requiring only ∼4.8 eV.…”

Section: Resultsmentioning

confidence: 74%

“…The self-absorption of PL as found for the excitation with visible light is not a concern here, thanks to the small penetration depths of these radiations. 21 Figure 3 displays the measured PLE spectrum, plotted in terms of PL quantum yield versus photon energy. The spectrum was obtained by referring to the PL quantum yield of 0.37 determined previously for the same samples at 170 nm.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Vacancy Centers in Diamond for High-Performance Detection of Vacuum Ultraviolet, Extreme Ultraviolet, and X-rays

Peng

et al. 2019

ACS Appl. Mater. Interfaces

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Fluorescent nanodiamonds (FNDs) containing nitrogen-vacancy (NV) centers as built-in fluorophores exhibit a nearly constant emission profile over 550–750 nm upon excitation by vacuum-ultraviolet (VUV), extreme ultraviolet (EUV), and X-radiations from a synchrotron source over the energy (wavelength) range of 6.2–1450 eV (0.86–200 nm). The photoluminescence (PL) quantum yield of FNDs increases steadily with the increasing excitation energy, attaining a value as great as 1700% at 700 eV (1.77 nm). Notably, the yield curve is continuous, having no gap in the VUV to X-ray region. In addition, no significant PL intensity decreases were observed for hours. Applying the FND sensor to measure the absorption cross-sections of gaseous O2 over 110–200 nm and comparing the measurements with the sodium-salicylate scintillator, we obtained results in agreement with each other within 5%. The superb photostability and broad applicability of FNDs offer a promising solution for the long-standing problem of lacking a robust and reliable detector for VUV, EUV, and X-radiations.

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“…2e ). The released photons could excite NV 0 but are unlikely to excite NV − directly since the lower absorption edge of NV − is located in the blue region of the spectrum 26 , 32 . Notably, however, the energy released from this radiative recombination is sufficient to ionize the negatively charged defects, thereby converting NV − to NV 0 , similar to that of far-UV excitation 32 .…”

Section: Resultsmentioning

confidence: 99%

“…The released photons could excite NV 0 but are unlikely to excite NV − directly since the lower absorption edge of NV − is located in the blue region of the spectrum 26 , 32 . Notably, however, the energy released from this radiative recombination is sufficient to ionize the negatively charged defects, thereby converting NV − to NV 0 , similar to that of far-UV excitation 32 . And this could be evidenced by the weakened emission of NV − centers whose phonon sidebands are suppressed under α-particle excitation, compared with the distinct phonon sidebands of NV 0 centers (Fig.…”

Section: Resultsmentioning

confidence: 99%

Quantifying nanodiamonds biodistribution in whole cells with correlative iono-nanoscopy

Chen

Tan

et al. 2021

Nat Commun

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Correlative imaging and quantification of intracellular nanoparticles with the underlying ultrastructure is crucial for understanding cell-nanoparticle interactions in biological research. However, correlative nanoscale imaging of whole cells still remains a daunting challenge. Here, we report a straightforward nanoscopic approach for whole-cell correlative imaging, by simultaneous ionoluminescence and ultrastructure mapping implemented with a highly focused beam of alpha particles. We demonstrate that fluorescent nanodiamonds exhibit fast, ultrabright and stable emission upon excitation by alpha particles. Thus, by using fluorescent nanodiamonds as imaging probes, our approach enables quantification and correlative localization of single nanodiamonds within a whole cell at sub-30 nm resolution. As an application example, we show that our approach, together with Monte Carlo simulations and radiobiological experiments, can be employed to provide unique insights into the mechanisms of nanodiamond radiosensitization at the single whole-cell level. These findings may benefit clinical studies of radio-enhancement effects by nanoparticles in charged-particle cancer therapy.

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Far‐UV‐Excited Luminescence of Nitrogen‐Vacancy Centers: Evidence for Diamonds in Space

Cited by 7 publications

References 41 publications

Optical selection and sorting of nanoparticles according to quantum mechanical properties

Optical selection and sorting of nanoparticles according to quantum mechanical properties

Nitrogen-Vacancy Centers in Diamond for High-Performance Detection of Vacuum Ultraviolet, Extreme Ultraviolet, and X-rays

Quantifying nanodiamonds biodistribution in whole cells with correlative iono-nanoscopy

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