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

1.2K
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...
1.2K
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

2.3K
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...
2.3K
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

5.1K
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...
5.1K

You might also read

Related Articles

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

Sort by
Same author

Genetic modification of the marine-derived yeast Yarrowia lipolytica with high-protein content using a GPI-anchor-fusion expression system.

Biotechnology progress·2009
Same author

Regulation of the Edwardsiella tarda hemolysin gene and luxS by EthR.

Journal of microbiology and biotechnology·2009
Same author

EBV LMP2A-specific T cell immune responses elicited by dendritic cells loaded with LMP2A protein.

Cellular & molecular immunology·2009
Same author

[Combination of volar buttress plate with external fixator for the distal radial fractures of type C3 caused by high-energy injuries].

Zhongguo gu shang = China journal of orthopaedics and traumatology·2009
Same author

Environmental regulation of floral anthocyanin synthesis in Ipomoea purpurea.

Molecular ecology·2009
Same author

PI3K integrates the effects of insulin and leptin on large-conductance Ca2+-activated K+ channels in neuropeptide Y neurons of the hypothalamic arcuate nucleus.

American journal of physiology. Endocrinology and metabolism·2009

Related Experiment Video

Updated: Mar 30, 2026

Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

2.8K

Universal Host Materials for High-Efficiency Phosphorescent and Delayed-Fluorescence OLEDs.

Wei Li1, Jiuyan Li1, Fang Wang1

  • 1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology , 2 Linggong Road, Dalian, 116024, China.

ACS Applied Materials & Interfaces
|November 7, 2015
PubMed
Summary

New bipolar host materials based on pyrazole and carbazole units were developed for organic light-emitting diodes (OLEDs). These materials demonstrate high efficiency in both phosphorescent and thermally activated delayed fluorescence (TADF) devices.

Keywords:
bipolar hostphosphorescent organic light-emitting diodes (OLEDs)pyrazolethermally activated delayed fluorescence (TADF)universal host materials

More Related Videos

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

10.2K
Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
06:25

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter

Published on: November 7, 2025

759

Related Experiment Videos

Last Updated: Mar 30, 2026

Development of Efficient OLEDs from Solution Deposition
07:09

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

2.8K
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

10.2K
Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
06:25

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter

Published on: November 7, 2025

759

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Organic light-emitting diodes (OLEDs) require efficient host materials for phosphorescent and thermally activated delayed fluorescence (TADF) emitters.
  • Developing bipolar hosts with tunable electronic properties is crucial for optimizing OLED performance.

Purpose of the Study:

  • To design and synthesize novel bipolar host materials incorporating pyrazole (n-type) and carbazole (p-type) units.
  • To investigate the effect of varying the pyrazole-to-carbazole molar ratio and linkage on material properties and device performance.
  • To evaluate the suitability of these hosts for blue and green phosphorescent and TADF OLEDs.

Main Methods:

  • Synthesis of four bipolar host compounds: o-CzDPz, m-CzDPz, 3-CzDPz, and mCPDPz.
  • Characterization of triplet energy (E(T)), frontier molecular orbital levels, and charge transport properties.
  • Fabrication and testing of phosphorescent and TADF OLED devices using these hosts with blue and green emitters.

Main Results:

  • Synthesized hosts exhibit high triplet energies (2.76–3.02 eV).
  • Optimized devices achieved high efficiencies: m-CzDPz blue PhOLED (48.3 cd A⁻¹, 26.8%), 3-CzDPz green PhOLED (91.2 cd A⁻¹, 29.0%), 3-CzDPz blue TADF OLED (26.2 cd A⁻¹, 15.8%), and 3-CzDPz green TADF OLED (41.1 cd A⁻¹, 13.3%).
  • Device performance was correlated with host molecular structure and electronic properties.

Conclusions:

  • Pyrazole-based bipolar compounds serve as effective universal host materials for both phosphorescent and TADF OLED applications.
  • Tuning the molar ratio and molecular conformation of these hosts allows for optimization of device efficiency.
  • The developed materials show significant promise for high-performance OLED displays and lighting.