P-210: Phosphorescence Ranging from Blue to Red from tris-Cyclometalated Iridium (III) Complexes and Application to Organic Light-Emitting Devices

• Published in: SID International Symposium Digest of technical papers 2008-05, Vol.39 (1), p.1997-2000
• Main Authors: Ren, Xiaofan, Liao, Liang-Sheng, Giesen, David J., Deaton, Joseph C., Klubek, Kevin P.
• Format: Article
• Language: English
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1889/1.3069590

Color tuning in the Ir(III)‐based phosphores has been accomplished by alteration of the cyclometalated ligand (C∧N). Highly efficient phosphorescence with emission peaks in the blue, green, yellowish‐green, yellow, and red spectral regions has been realized and their use in organic light‐emitting devices (OLEDs) is described in this paper. Efficient blue phosphorescent devices can achieve external quantum efficiencies up to 8.8% at 1 mA/cm2 with CIE coordinates of (0.14, 0.23). with the addition of one bluish‐green‐emitting and four red‐emitting coumarin‐based Ir(III) dopants to the family of the coumarin‐based Ir(III) dopants reported previously, highly efficient and long‐lived OLEDs, with colors ranging from green, yellowish‐green, yellow, to red, have been realized. Incorporation of these coumarin‐based cyclometalated Ir(III) dopants into novel tandem OLED structures gives highly efficient and stable white OLEDs.