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Structurally Strained Red-BODIPYs for High-Color-Purity Organic Light Emitting Diodes
Ajeet Chandra1, Nisha Vergineya S1, Odugu Pavan Kumar1
1Organic Optoelectronic Device Lab. (OODL), Department of Information Display, Kyung Hee University,26, Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea.
ACS Applied Materials & Interfaces
|August 7, 2025
Summary
New Boron dipyrromethene (BODIPY) emitters achieve deep-red narrow emission, meeting BT2020 standards with high photoluminescence quantum yield (PLQY). The DBF-BODIPY molecule demonstrated excellent performance in organic light-emitting diodes (OLEDs).
Area of Science:
- Organic Chemistry
- Materials Science
- Photophysics
Background:
- Boron dipyrromethene (BODIPY) dyes offer high photoluminescence quantum yield (PLQY) and narrow emission spectra.
- Achieving deep-red narrow emission that meets BT2020 standards with high PLQY is a significant challenge in fluorescent materials development.
Purpose of the Study:
- To develop novel red fluorescent emitters based on BODIPY with improved deep-red emission properties.
- To investigate the effect of meso-position substituents on the photophysical properties and emission characteristics of BODIPY dyes.
- To evaluate the performance of these novel emitters in thermally activated delayed fluorescence (TADF)-sensitized organic light-emitting diodes (OLEDs).
Main Methods:
- Synthesis of four new BODIPY derivatives (DBF-BODIPY, DFP-BODIPY, TFP-BODIPY, PFP-BODIPY) by substituting dibenzofuranyl and fluorophenyl units at the meso-position.
- Photophysical characterization including emission spectra, full width at half-maximum (fwhm), and PLQY measurements in toluene solution.
- Fabrication and characterization of TADF-sensitized OLEDs using the synthesized BODIPY emitters.
Main Results:
- The synthesized BODIPY derivatives exhibited emission in the deep-red region (619-635 nm) with narrow fwhm (33-39 nm).
- Pentafluorophenyl substitution resulted in narrow fwhm and CIE coordinates close to BT2020 standards.
- DBF-BODIPY showed the highest PLQY (98%) and its corresponding OLED achieved a maximum external quantum efficiency (EQEmax) of 17.0% at 619 nm.
- The DBF-BODIPY based OLED demonstrated a long operational lifetime (LT90) of 152 hours at 5000 cd/m².
Conclusions:
- Novel BODIPY derivatives with tunable deep-red emission and narrow fwhm have been successfully developed.
- These emitters show great potential for applications in high-performance OLEDs, particularly for meeting stringent color standards.
- The study highlights the effectiveness of strategic substituent modification on BODIPY core for advanced optoelectronic applications.
