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 Experiment Video

Updated: Jul 18, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
10:41

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

8.8K

Highly Efficient Ultra-Thin EML Blue PHOLEDs with an External Light-Extraction Diffuser.

Shin-Woo Kang1,2, Eun-Jeong Bae1,2, Young-Wook Park2

  • 1Display and Nanosensor Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|August 26, 2023
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

Improving Efficiency and Color Purity of Blue Top-Emitting Organic Light-Emitting Diodes: Distributed Bragg Reflectors for Surface Plasmon Polariton Suppression and Cavity-Resonance Enhancement.

ACS applied materials & interfaces·2026
Same author

Fabrication of Nanostructures on Surface of Micro-Lens Arrays Using Reactive Ion Etching.

Micromachines·2025
Same author

Simple Process for Flexible Light-Extracting QD Film and White OLED.

Micromachines·2025
Same author

Absorber-Free Laser Welding of Transparent Thermoplastic Films via Expanded Beam for Flexible Displays.

ACS applied materials & interfaces·2025
Same author

High-resolution all-inkjet-printed quantum dot light emitting diodes with reduced intermixing using crosslinkable hole transport layer.

Nanotechnology·2025
Same author

Gaussian Filter-Based Image Denoising Detects Hidden Sweat Glands and Enhances Reliability of Active Sweat Gland Density Measurements.

Journal of physiological investigation·2025

Diffusers enhance blue phosphorescent organic light-emitting diodes (PHOLEDs) by improving electroluminescence (EL) efficiency and viewing angle. Optimal diffuser design, particularly large, close-packed hemispheres, significantly boosts external quantum efficiency (EQE).

Area of Science:

  • Materials Science
  • Optoelectronics
  • Organic Electronics

Background:

  • Blue phosphorescent organic light-emitting diodes (PHOLEDs) are crucial for display technology but face challenges in efficiency and viewing angle.
  • Ultra-thin emission layer (EML) structures are employed to enhance PHOLED performance.
  • Diffusers are investigated as a method to improve light extraction and overall device characteristics.

Purpose of the Study:

  • To systematically analyze the impact of various diffusers on the electroluminescence (EL) characteristics of ultra-thin EML blue PHOLEDs.
  • To optimize diffuser design (pattern-shape, size, distribution, packing) for improved efficiency and viewing angle.
  • To understand the relationship between diffuser structure and EL performance enhancement.

Main Methods:

Keywords:
FIrpicblue OLEDsdiffuserembeddedhemispherelight extractionorganic light-emitting diodes (OLEDs)phosphorescentsphereultra-thin EMLundopedviewing angle

More Related Videos

Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

2.2K
Blue-hazard-free Candlelight OLED
10:18

Blue-hazard-free Candlelight OLED

Published on: March 19, 2017

9.5K

Related Experiment Videos

Last Updated: Jul 18, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
10:41

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

8.8K
Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

2.2K
Blue-hazard-free Candlelight OLED
10:18

Blue-hazard-free Candlelight OLED

Published on: March 19, 2017

9.5K
  • Fabrication of blue PHOLEDs with ultra-thin EML structures.
  • Integration of various diffusers with differing shapes (hemisphere/sphere), sizes (4-75 μm), distributions (surface/embedded), and packing (close-packed/random).
  • Systematic analysis of electroluminescence (EL) characteristics, including external quantum efficiency (EQE) and viewing angle profiles.

Main Results:

  • Diffuser application significantly enhanced EL characteristics, with improvements dependent on diffuser structure.
  • The largest-sized, close-packed hemisphere diffuser (75 μm) achieved the highest EQE improvement (1.47-fold), reaching 24.3% from a reference 16.6%.
  • A 5.1% wider viewing angle was observed with the optimized diffuser compared to the reference device.

Conclusions:

  • Diffusers can be selectively applied to improve EL efficiency and viewing angle in ultra-thin EML blue PHOLEDs.
  • Diffuser design, particularly size and packing, is critical for maximizing EQE enhancement.
  • Further investigation into high-density, large-sized embedded structures shows potential for wide viewing angles and considerable EQE gains.