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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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...
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New Direct Approach for Determining the Reverse Intersystem Crossing Rate in Organic Thermally Activated Delayed

Ricardo Javier Vázquez1, Ju Hui Yun2, Angelar K Muthike1

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States.

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|April 16, 2020
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We developed a new optical method to measure reverse intersystem crossing (k_rISC) in thermally activated delayed fluorescent (TADF) materials. Higher k_rISC values correlate with improved organic light-emitting diode (OLED) efficiency and stability.

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Area of Science:

  • Organic electronics
  • Photophysics
  • Materials science

Background:

  • Thermally activated delayed fluorescence (TADF) materials offer a pathway to high-efficiency organic light-emitting diodes (OLEDs).
  • Efficient harvesting of triplet excitons is crucial for maximizing OLED performance.
  • Reverse intersystem crossing (k_rISC) is a key photophysical parameter influencing TADF efficiency.

Purpose of the Study:

  • To develop and validate a novel optical method for determining k_rISC in TADF chromophores.
  • To establish a correlation between k_rISC and the performance metrics of OLED devices.
  • To investigate the impact of k_rISC on external quantum efficiency (EQE) and device stability at high brightness.

Main Methods:

  • Utilized time-resolved transient absorption spectroscopy to measure k_rISC.
  • Synthesized and characterized a series of TADF chromophores with varying donor (carbazole, acridine) and acceptor (triazine, benzonitrile) moieties.
  • Compared the developed optical method with emission lifetime-based methodologies.

Main Results:

  • Successfully correlated k_rISC with OLED device performance, including EQE and stability.
  • Demonstrated that higher k_rISC values lead to higher EQE at low voltages and reduced EQE roll-off at high voltages.
  • Identified a threshold k_rISC (≤ 10^5 s^-1) below which TADF effects are negligible and device efficiency is limited.

Conclusions:

  • The proposed optical method accurately predicts OLED device performance based on k_rISC.
  • Achieving a large k_rISC is essential for developing stable and efficient TADF-based OLEDs.
  • The developed method provides a more reliable assessment of k_rISC compared to traditional emission lifetime techniques.