Phosphorescent blue dopant

SCHEME 3.89 Chemical structures of some blue-phosphorescent dopants. 

SCHEME 3.90 Chemical structure of blue-phosphorescent dopants. 

PL 414-427 nm PL 390-402 r SCHEME 3.91 Chemical structure of blue-phosphorescent dopants. 

Abstract Mononuclear Ir(III)-polyimine complexes show outstanding luminescence properties, i.e., high intensities, lifetimes in the is time range, and emission wavelengths that can be tuned so as to cover a full range of visible colors, from blue to red. We discuss the approaches for the use of ligands that afford control on luminescence features. Emphasis is placed on subfamilies of cyclometalated complexes, whose recent enormous expansion is motivated by their potential for applications, including that as phosphorescent dopants in OLEDs fabrication. The interplay of the different excited states associated... 

Changing the chemical structure of the cyclometalating (C N) ligand allows easy control of the color of phosphorescent emission. Efficient phosphorescent OLEDs with various lr(in)-based dopants emitting in a wide range of colors from deep red to deep blue have been demonstrated and will be discussed in the following sections. 

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