Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

IR Absorption Frequency: Hybridization

IR Absorption Frequency: Hybridization

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 stretch at a...

Super-resolution Fluorescence Microscopy

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

Mass Analyzers: Common Types

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

You might also read

Related Articles

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

Sort by

Same author

Ultrasensitive extracellular vesicles-associated amyloid-β<sub>1-42</sub> oligomers analytical platform for early diagnosis of Alzheimer's disease.

Biosensors & bioelectronics·2026

Same author

High-performance narrowband blue electroluminescence with EQE approaching 20% based on hybridized local and charge-transfer multi-resonant molecules.

Chemical science·2025

Same author

Correction to "Hydrogen Bond-Driven N‑Terminal Amyloid β Mimetics Attenuate Neurotoxic Aggregation".

Chemistry of materials : a publication of the American Chemical Society·2025

Same author

Space-Confined Hydrogel Particle-Based Biosensor for Early Warning of Aflatoxin B1 via Rapid Label-Free Fluorescence Detection of the <i>afl</i>D Gene.

Analytical chemistry·2025

Same author

Direct and selective nanosensor for amyloid-β oligomers in serum for Alzheimer's disease diagnosis.

RSC advances·2025

Same author

Giant nonlinear Raman responses from organic semiconductors.

Nature materials·2025

Search research articles

Related Experiment Video

Updated: Jun 5, 2026

Triplet Fusion Upconversion Nanocapsule Synthesis

Triplet Fusion Upconversion Nanocapsule Synthesis

Published on: September 7, 2022

Highly efficient multiphoton-absorbing quadrupolar oligomers for frequency upconversion.

Xin Jiang Feng¹, Po Lam Wu, King Fai Li

¹Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|January 26, 2011

Summary

New quadrupolar oligofluorenes with D-π-D and D-π-A-π-D structures show strong multiphoton absorption. The D-π-D molecules exhibit superior frequency-upconverted deep blue lasing, offering insights for designing efficient photoluminescent and lasing materials.

More Related Videos

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

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

Published on: September 12, 2014

Related Experiment Videos

Last Updated: Jun 5, 2026

Triplet Fusion Upconversion Nanocapsule Synthesis

Triplet Fusion Upconversion Nanocapsule Synthesis

Published on: September 7, 2022

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

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

Published on: September 12, 2014

Area of Science:

Organic Chemistry
Materials Science
Photophysics

Background:

Oligofluorenes are explored for optoelectronic applications.
Diphenylamino-endcapped oligofluorenes with D-π-D and D-π-A-π-D motifs were synthesized.
The study investigates multiphoton absorption and emission properties.

Purpose of the Study:

To synthesize and characterize novel quadrupolar oligofluorenes.
To evaluate their multiphoton absorption and photoluminescence.
To investigate their suitability for frequency-upconverted lasing applications.

Main Methods:

Palladium-catalyzed Suzuki cross-coupling for synthesis.
Infrared femtosecond laser pumping for excitation.
Spectroscopic analysis of photoluminescence and lasing properties.

Main Results:

Synthesized two series of quadrupolar oligofluorenes: PhN-OF(n)-NPh and PhN-OF(n)-TAZ-OF(n)-NPh.
Observed strong multiphoton-excited blue photoluminescence.
Achieved high three-photon absorption cross-sections (up to 2.72×10(-77) cm(6) s(2)).
PhN-OF(n)-NPh oligomers demonstrated intense, efficient multiphoton-excited frequency-upconverted deep blue lasing with record efficiency (0.097%).

Conclusions:

Quadrupolar molecules are superior to dipolar counterparts for multiphoton excited frequency-upconverted lasing.
The D-π-D oligofluorenes show remarkable lasing performance.
Findings provide guidelines for designing efficient three-photon absorption molecules for photoluminescence and lasing.