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

Super-resolution Fluorescence Microscopy01:37

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.

You might also read

Related Articles

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

Sort by
Same author

Metabolic acidosis as a risk factor for bronchopulmonary dysplasia in preterm infants born between 23 + 0 and 31 + 6 weeks of gestation: a retrospective case-control study.

Frontiers in pediatrics·2025
Same author

Heterogeneous integration of a GaN-based photonic integrated circuit with an Si-based transimpedance amplifier.

Optics letters·2023
Same author

High-Throughput Generation, Manipulation, and Degradation of Magnetic Nanoparticle-Laden Alginate Core-Shell Beads for Single Bacteria Culturing Analysis.

IEEE transactions on nanobioscience·2022
Same author

Electrochemical characteristics of amorphous silicon carbide film as a lithium-ion battery anode.

RSC advances·2022
Same author

In Situ Characterization for Boosting Electrocatalytic Carbon Dioxide Reduction.

Small methods·2021
Same author

Whispering-gallery mode InGaN microdisks on GaN substrates.

Optics express·2021

Related Experiment Video

Updated: Jul 4, 2026

Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications
08:06

Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications

Published on: June 2, 2017

Spectral conversion with fluorescent microspheres for light emitting diodes.

K N Hui1, P T Lai, H W Choi

  • 1Department of Electrical and Electronic Engineering, University of Hong Kong.

Optics Express
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel spectral conversion method for light-emitting diodes (LEDs) using fluorescent microspheres. This technique achieves efficient white light emission by coating GaN micro-LEDs with precisely mixed green and red microspheres.

More Related Videos

Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
10:33

Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts

Published on: March 8, 2017

Photoconversion of Purified Fluorescent Proteins and Dual-probe Optical Highlighting in Live Cells
11:21

Photoconversion of Purified Fluorescent Proteins and Dual-probe Optical Highlighting in Live Cells

Published on: June 26, 2010

Related Experiment Videos

Last Updated: Jul 4, 2026

Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications
08:06

Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications

Published on: June 2, 2017

Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
10:33

Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts

Published on: March 8, 2017

Photoconversion of Purified Fluorescent Proteins and Dual-probe Optical Highlighting in Live Cells
11:21

Photoconversion of Purified Fluorescent Proteins and Dual-probe Optical Highlighting in Live Cells

Published on: June 26, 2010

Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Lighting

Background:

  • Traditional white light-emitting diodes (LEDs) often rely on phosphors for color conversion, which can have limitations in efficiency and color quality.
  • Gallium Nitride (GaN) micro-LEDs offer high efficiency and small form factors, making them promising for advanced lighting applications.
  • Controlling the spectral output of LEDs is crucial for achieving desired color temperatures and high luminous efficacy.

Purpose of the Study:

  • To demonstrate an innovative spectral conversion scheme for light-emitting diodes (LEDs) utilizing fluorescent microspheres.
  • To achieve tunable white light emission from a GaN micro-LED by employing a mixture of green and red fluorescent microspheres.
  • To investigate the self-assembly properties of microspheres for uniform coating on micro-LED surfaces.

Main Methods:

  • A high-extraction-efficiency Gallium Nitride (GaN) micro-LED emitting at 470 nm was used as the base device.
  • An optimally mixed proportion of green and red fluorescent microspheres were coated onto the micro-LED.
  • The self-assembly behavior of the microspheres was utilized to form ordered, uniform hexagonal arrays on the LED surface.

Main Results:

  • Devices achieved both cool and warm white light emission through spectral conversion.
  • A bluish-white LED exhibited a luminous efficacy of 27.3 lm/W at 20 mA with CIE coordinates (0.26, 0.28) and a correlated color temperature (CCT) of 8500K.
  • A yellowish-white LED demonstrated a luminous efficacy of 26.67 lm/W at 20 mA with CIE coordinates (0.36, 0.43) and a CCT of 13000K.

Conclusions:

  • The proposed spectral conversion scheme using fluorescent microspheres is effective for generating white light from micro-LEDs.
  • The self-assembly of microspheres provides a method for creating uniform and ordered coating layers, crucial for consistent optical performance.
  • This approach offers a viable pathway for developing advanced white LEDs with tunable color properties and high luminous efficacy.