Bis(2-phenylquinoline)(2,2,6,6-tetramethylheptane-3,5-dionate)iridium(III) - Ir(dpm)PQ2, also known as Ir(PQ)2(tmd) is an orange to red phosphorescent emitter. The ligand 2,2,6,6-tetramethylheptane-3,5-dionate corrdinated to the iridium centre is sterically hindered with two bulky tert-butyl groups at both ends.
Ir(dpm)PQ2 is often either used in pure red as a single emitting layer material or in white emitting highly efficient OLED devices for its low lying triplet energy state and greater stability, preventing triplet-triplet annihilation thus leading to higher device efficiencies.
Highly efficient single- and multi-emission-layer fluorescent/phosphorescent hybrid white organic light-emitting diodes with ~20% external quantum efficiency, X. Li et al., J. Mater. Chem. C, 3, 9233 (2015); DOI: 10.1039/c5tc02050f.
High-Efficiency Blue and White Organic Light-Emitting Devices Incorporating a Blue Iridium Carbene Complex, H. Sasabe et al., Adv. Mater., 22, 5003–5007 (2010); DOI: 10.1002/adma.201002254.
Predicting Operational Stability for Organic Light-Emitting Diodes with Exciplex Cohosts, Z. Wang et al., Adv. Sci., 6, 1802246 (2019); DOI: 10.1002/advs.201802246.
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