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

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

You might also read

Related Articles

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

Sort by
Same author

Association between Menopausal Hormone Therapy and Cancer: A Nationwide Retrospective Cohort Study in South Korea.

Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology·2026
Same author

Risk of cardiovascular disease associated with use of tumor necrosis factor inhibitors in ankylosing spondylitis.

Journal of rheumatic diseases·2025
Same author

Machine learning-based prediction of response to Janus kinase inhibitors in patients with rheumatoid arthritis using clinical data.

Frontiers in immunology·2025
Same author

Rheumatoid factor and anti-cyclic citrullinated peptide antibody levels decline in rheumatoid arthritis patients treated with Janus kinase inhibitors or biological disease-modifying anti-rheumatic drugs.

Journal of rheumatic diseases·2025
Same author

Safety and Effectiveness of Eribulin in Patients with Advanced or Metastatic Breast Cancer Previously Treated with Anthracyclines and Taxanes in Real-World Clinical Practice: A 6-Year Post-marketing Surveillance Study in South Korea.

Cancer research and treatment·2025
Same author

Outcomes of cesarean myomectomy in Singleton compared with twin pregnancies: a 10-year retrospective cohort study.

BMC surgery·2025

Related Experiment Video

Updated: May 19, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
08:51

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

Published on: October 24, 2017

Red phosphorescent organic light-emitting diodes based on the simple structure.

Ji Hyun Seo1, Seok Jae Lee, Bo Young Kim

  • 1Department of Information Display, Hongik University, Seoul 121-791, Korea.

Journal of Nanoscience and Nanotechnology
|August 3, 2012
PubMed
Summary

Simple red phosphorescent organic light-emitting diodes (OLEDs) achieve high efficiency and pure color without hole layers. This simplifies fabrication and improves performance through direct anode-to-dopant hole injection.

More Related Videos

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
07:44

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Published on: November 16, 2018

Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Related Experiment Videos

Last Updated: May 19, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
08:51

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

Published on: October 24, 2017

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
07:44

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

Published on: November 16, 2018

Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Area of Science:

  • Materials Science
  • Organic Electronics
  • Device Physics

Background:

  • Organic light-emitting diodes (OLEDs) typically require hole injection and transport layers for efficient operation.
  • Simplifying OLED structures can reduce manufacturing costs and improve device performance.

Purpose of the Study:

  • To investigate the feasibility of fabricating highly efficient red phosphorescent OLEDs without hole injection and transport layers.
  • To explore the impact of dopant concentration on device performance.

Main Methods:

  • Fabrication of OLED devices with the structure ITO/CBP:Ir(pq)2(acac)/BPhen/Liq/Al.
  • Varying the doping concentration of the red dopant Ir(pq)2(acac) from 4% to 20%.

Main Results:

  • Achieved high quantum efficiencies (up to 16.7%) without hole injection/transport layers.
  • Demonstrated stable roll-off efficiency and pure emission color.
  • Observed superior performance compared to devices with hole transporting layers due to direct hole injection.

Conclusions:

  • Simple layered red phosphorescent OLEDs can achieve high efficiency and performance without conventional hole layers.
  • Direct hole injection from the anode to the dopant layer is an effective strategy for simplifying OLED architecture and enhancing performance.