Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

1.5K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.5K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

3.0K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.0K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

6.8K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
6.8K
Photoelectric Effect02:26

Photoelectric Effect

30.7K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
30.7K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.4K
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.7K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
1.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Impact of BMI on optimal PEEP titrated by electrical impedance tomography in ARDS patients: A retrospective study.

Respiratory medicine·2026
Same author

Non-HIV Pneumocystis jirovecii pneumonia-associated immune reconstitution inflammatory syndrome: a case report and systematic review.

BMC infectious diseases·2026
Same author

Association Between Systemic Inflammation Response Index, Worsening of Left Ventricular Systolic Function and Prognosis in Patients with Coronary Artery Disease.

Journal of inflammation research·2026
Same author

Cardiovascular Screening and Clearance Pathways for Recreational Athletes: Beyond the Elite.

JACC. Case reports·2026
Same author

In vivo release of titanium-containing nanoparticles from 3D-printed hydroxyapatite-coated implants using single-particle inductively coupled plasma mass spectrometry.

Talanta·2026
Same author

Exploring the potential impact of TNF-α inhibition on major depressive disorder risk: Insights from a prospective cohort and genetic evidence.

Brain, behavior, and immunity·2026
Same journal

High Pressure Synthesis of Ultrasmall Nanodiamonds with Nitrogen Vacancy Centers.

Nano letters·2026
Same journal

Efros-Shklovskii Law at the Thinnest Limit of a Material.

Nano letters·2026
Same journal

Oxygen Electronic Configuration Modulation Triggering Reversible Anionic Redox Chemistry toward High Voltage Tolerant Sodium Layered Oxide.

Nano letters·2026
Same journal

Development of a Nanoscale Protein-Protein Mapping of PDE4 Interface-Disrupting Peptides.

Nano letters·2026
Same journal

Lubricin-Protected Plasmonic Nanoslides Enable Stable, Reusable, Nonfouling, and Ultrasensitive Biomimetic-SERS Sensing for the Detection of Vancomycin in Unprocessed Whole Blood.

Nano letters·2026
Same journal

Forcing a Molecule to Switch: Quantifying Mechanical Control at the Atomic Scale.

Nano letters·2026
See all related articles

Related Experiment Video

Updated: Apr 30, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

8.0K

Boosting Upconversion through Selective Interfacial Energy Transfer toward Infrared Sub-bandgap Photodetection.

Haopeng Wei1, Qianlin Wang2, Haozhang Huang1

  • 1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 51064, China.

Nano Letters
|April 29, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new core-shell nanocrystal model to overcome concentration quenching in photon upconversion. This design significantly enhances luminescence intensity and allows for tunable emission colors, opening doors for infrared photodetection.

Keywords:
core−shell nanostructureinfrared photodetectioninterfacial energy transferlanthanidesupconverison

More Related Videos

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

12.1K
An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
11:20

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

6.8K

Related Experiment Videos

Last Updated: Apr 30, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

8.0K
Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
11:26

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

12.1K
An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
11:20

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

6.8K

Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Photon upconversion in nanocrystals is promising for applications but hindered by concentration quenching.
  • Conventional nanoparticles struggle with high doping levels due to this effect.

Purpose of the Study:

  • To introduce a conceptual model for boosting upconversion efficiency in nanocrystals.
  • To address the challenge of concentration quenching in heavy doping scenarios.

Main Methods:

  • Utilizing core-shell nanocrystals with controlled interfacial energy transfer (IET).
  • Achieving 100% doping of sensitizer and activator within a single nanocrystal.
  • Atomically manipulating interfacial interactions between Erbium (Er) and Ytterbium (Yb) sublattices.

Main Results:

  • A 2-orders-of-magnitude enhancement in luminescence intensity was achieved.
  • Nonradiative energy loss was significantly minimized.
  • Demonstrated temporal tuning of switchable red-to-green emission colors via IET channels.

Conclusions:

  • The proposed model effectively boosts upconversion by controlling IET and minimizing energy loss.
  • Provides new insights into upconversion physics in heavily doped nanomaterials.
  • Offers potential for advanced infrared photodetection and photonic applications.