Rational design of phosphorescent iridium(III) complexes for emission color tunability and their applications in OLEDs

Organic light emitting diodes (OLEDs) with slot-die coated functional layers

“…The third parameter, η ST , account for a fraction of exciton that are able to decay radiatively because of quantum mechanics spin statistic rules. For fluorescent materials this factor can reach up to 25% and for phosphorescent or thermally activated delayed fluorescence molecule this factor can be 100 % 73,74 . The product of first three factors: electrical efficiency (χ), fraction of radiative decay (φ f ) and spin factor (η ST ) gives rise to internal quantum efficiency ( )., which indicates the emission of photons from the emitter in the case of EL.…”

Protecting benzylic C–H bonds by deuteration doubles the operational lifetime of deep blue Ir-phenylimidazole dopants in phosphorescent OLEDs

“…[1][2][3][4][5] Cyclometalated Ir( ) complexes are particularly interesting, as their color can be tuned over the entire visible range from blue to red. [6][7][8][9][10][11][12][13][14][15][16] But nding blue phosphorescent materials that are robust enough for industrial applications proved challenging, which may be rationalized by the large band gap [17][18][19] compared to red or green emitters, leading to high-energy excited states that are consequently more reactive and are therefore expected to degrade more easily. Such degradation may give rise to short device lifetime and low e ciency.…”

Development of tris-cyclometalated iridium complexes for cellular imaging through structural modification

“…[1][2][3] This is attributed to their rich photochemical properties, which results in their utility in areas such as cellular imaging, Organic Light Emitting Devices (OLEDs), potoredox catalysis, and others. [4][5][6][7][8][9] Luminescence lifetimes reaching the microsecond regime, large Stokes' shifts, and ease of spectral tuning of emission are the key favorable properties of these compounds. These desirable bio-physical properties result from the interplay of the iridium ion and its ligands.…”