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Related Concept Videos

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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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.
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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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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.
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Development of Efficient OLEDs from Solution Deposition
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Published on: November 4, 2022

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Blended host ink for solution processing high performance phosphorescent OLEDs.

Tong Lin1,2, Xue Sun1,2, Yongxu Hu3

  • 1Printable electronics research center, Suzhou Institute of nanotech and nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, Jiangsu, P.R. China.

Scientific Reports
|May 4, 2019
PubMed
Summary
This summary is machine-generated.

A novel blended host material, combining mCP and TPBi, effectively addresses interface issues in solution-processed phosphorescent OLEDs. This approach achieved high current and external quantum efficiencies for both spin-coated and inkjet-printed devices.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Device Physics

Background:

  • Interface issues in solution deposition of multilayer OLEDs hinder device performance.
  • Developing robust deposition methods is crucial for efficient organic light-emitting diode (OLED) fabrication.
  • Phosphorescent OLEDs (PhOLEDs) offer high efficiency but require careful material design.

Purpose of the Study:

  • To introduce and evaluate a blended host concept for solution-processed PhOLEDs.
  • To investigate the impact of spin-coating and inkjet printing on device performance using the blended host.
  • To resolve interface challenges in multilayer OLED fabrication.

Main Methods:

  • A blended host material comprising 1,3-bis(carbazolyl)benzene (mCP) and 1,3,5-tri(phenyl-2-benzimidazoly)-benzene (TPBi) was synthesized.
  • Phosphorescent OLEDs were fabricated using both spin-coating and inkjet printing techniques with the blended host.
  • Device performance metrics, including current efficiency (CE) and external quantum efficiency (EQE), were measured.
  • Film morphology and properties resulting from different deposition methods were analyzed.

Main Results:

  • Spin-coated devices achieved a maximum current efficiency of 24.2 cd A-1 and an external quantum efficiency of 7.0%.
  • Inkjet-printed devices demonstrated a maximum current efficiency of 23.0 cd A-1 and an external quantum efficiency of 6.7%.
  • The study explored the influence of processing methods (spin-coating vs. inkjet printing) on the final device characteristics.

Conclusions:

  • The blended host concept successfully mitigates interface issues in solution-deposited multilayer OLEDs.
  • Both spin-coating and inkjet printing are viable methods for fabricating high-performance PhOLEDs using the developed blended host.
  • The findings provide insights into optimizing solution processing for efficient organic electronic devices.