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Tetradentate Pt[O^N^C^N] complexes with peripheral diarylamino substituents for high-performance and stable green organic light-emitting diodes with LT95 of 17 140 h at 1000 cd m−2.
- Source :
- Journal of Materials Chemistry C; 5/7/2024, Vol. 12 Issue 17, p6035-6045, 11p
- Publication Year :
- 2024
-
Abstract
- Phosphorescent metal emitters that remain stable under OLED (organic light-emitting diode) operating conditions are critical for the commercialization of organic displays and lighting technologies. Until now, only a few non-iridium emitters, including platinum emitters, can meet industry standard requirements for OLED operational lifetime. Here, we report four new tetradentate Pt[O^N^C^N] complexes (Pt1–Pt4) in which the [O^N^C^N] ligand contains peripheral o-diphenylamine or o-carbazole group(s). These o-arylamino groups can (1) increase steric hindrance, inhibit the formation of excimers, and improve efficiency and color purity; (2) cause a fast radiative decay rate, reduce device efficiency roll-off, and extend OLED device operational lifetime. OLEDs with Pt2 as the emitter exhibit an unprecedented long operational lifetime: an LT<subscript>95</subscript> of up to 17 140 h at 1000 cd m<superscript>−2</superscript>, which is comparable to that of state-of-the-art iridium emitters. This result is one of the best values reported in the literature for non-iridium-based OLEDs. In addition, a phosphor sensitized fluorescent OLED device was fabricated using Pt2 as the sensitizer, with an EQE<subscript>max</subscript> as high as 30.3% and improved color purity, characterized by a reduction in FWHM to 29 nm and CIE coordinates of (0.29, 0.67). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 12
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 176985252
- Full Text :
- https://doi.org/10.1039/d4tc00614c