Syntheses, photoluminescence and electroluminescence of some new blue-emitting phosphorescent iridium(III)-based materials

Synthetically Tailored Excited States: Phosphorescent, Cyclometalated Iridium(III) Complexes and Their Applications

“…[48] OLEDs that are constructed with neutral complexes typically consist of the luminescent chromophore embedded in an organic matrix (e.g., 4,4'-N,N'-dicarbazolylbiphenyl, CBP), sandwiched between multiple layers of charge transport materials (e.g., 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, BCP and 4,4'-bis-[N-(naphthyl-N-phenylamino)biphenyl, a-NPD, respectively), and capped with a low workfunction cathode (e.g., LiF/Al) and a transparent anode (e.g., indium-tin oxide, ITO; Figure 5a). [49] By systematically adjusting the nature of the excited state in the chromophore, Thompson and Forrest have observed emission across the visible spectrum. [15,28] Similarly, Holmes and Friend finetuned electroluminescence in the green-to-blue regime through synthetic modifications to the chromophore and, more importantly, improved the operational lifetime of the devices through the use of more stable (i.e., less labile) ancillary ligands.…”

Phosphorescent Thymidine Triphosphate Sensor Based on a Donor–Acceptor Ensemble System using Intermolecular Energy Transfer

“…[10] Therefore, its emission maximum is found at 475 nm, which is almost identical to that of FIrpic, but emission spectral shape is dependent on the solvent environment (Figure 2b). [11] The absorption spectrum of compound 2 in buffer shows relatively weak MLCT absorption compared with that of FIrpic in 2-methyltetrahydrofuran (2-MeTHF). However, the inset of Figure 2b clearly shows the MLCT region of compound 2, and the spectral overlap between the absorption spectrum of 2 over 350 nm and the emission spectrum of 1.…”

“…The residue was purified by column chromatography on www.chemeurj.org Compound 11: This compound was prepared according to the literature procedure. [11] Compound 12: DPA (4.17 g, 20.9 mmol) was added slowly to a solution of 37 % aqueous formaldehyde (1.86 g, 22.9 mmol) and ethanol (5 mL). The reaction mixture was heated at reflux for 12 h, and compound 11 (2.36 g, 9.95 mmol) in ethanol (20 mL) was added.…”

Towards a phosphorescent cyclometalated iridium complex containing a modified polymerizable acetylacetonato ligand

“…Because of their high luminescence quantum yields and short phosphorescence lifetimes these compounds are suitable for various applications in photochemistry and in organic light-emitting devices (OLEDs) and exhibit still the efficient phosphorescent dyes in this field up to now, e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In this light, one of the best green-light-emitting complexes is the compound fac-[Ir(ppy) 3 )] yielding a high quantum efficiency [17].…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In this light, one of the best green-light-emitting complexes is the compound fac-[Ir(ppy) 3 )] yielding a high quantum efficiency [17]. Moreover the more efficient green-light-emitting complex [Ir(ppy) 2 (acac)] as the phosphorescent dopant was reported [18].…”