Recent Advances in Highly-Efficient Near Infrared OLED Emitters

    January 2024 in “ Materials chemistry frontiers (Online) ”
    Paloma L. dos Santos, Patrycja Stachelek, Yoshifumi Takeda, Piotr Pander
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    TLDR New near-infrared OLED emitters are more efficient, especially platinum(II) complexes, and have promising applications like hair growth treatment.
    The document reviews recent advancements in highly efficient near-infrared (NIR) organic light-emitting diode (OLED) emitters, focusing on platinum(II), iridium(III), and osmium(II) complexes, thermally activated delayed fluorescence (TADF) emitters, fluorescent dyes, and luminescent radicals. Platinum(II) complexes demonstrate superior efficiency across nearly all wavelengths from 700 to 1000 nm, exceeding the current NIR OLED efficiency boundary. The authors suggest radiant emittance in mW cm−2 as the standard unit for describing emitted radiant flux in NIR OLEDs and highlight the need for more narrowband NIR emitters. NIR OLEDs have applications in non-invasive imaging, security, photodynamic therapy, sensing, solar cells, and biological applications, including promoting hair growth. In hair growth, red OLEDs have shown promising results in treating alopecia, increasing hair length by a factor of 1.5 and enlarging the hair regrowth area by over 3 times after 20 days of treatment. The document concludes that while significant progress has been made, further research is needed to fully realize the potential of NIR OLEDs.
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