Luminescent Neutral Platinum Complexes Bearing an Asymmetric N^{^}N^{^}N Ligand for High‐Performance Solution‐Processed OLEDs

Abstract

The synthesis and full characterization of new platinum complexes bearing a bulky asymmetric dianionic tridentate ligand is reported. The hindrance of the ligand prevents detrimental intermolecular interactions yielding to highly emitting species in both crystalline state and thin-film. Such properties prompted their successful use in solution-processed OLEDs, showing remarkable external quantum efficiency up to 5.6%.

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

“…The resulting device provides a high peak PE of 49.5 lm W À1 and a PE of 30.0 lm W À1 at 1000 cd m À2 with unchanged CIE coordinates in the luminance range of 1-10 000 cd m À2 , which are very attractive in terms of the trade-off among efficiency/ color-stability/simplicity aspects. 330 Although only one adamantyl group is attached to the triazolyl flank in Pt-Az6 and Pt-Az7, the intermolecular interactions in Pt-Az6 and Pt-Az7 can still be controlled. However, the excimer and/or MMLCT related emissions are always in the yellow to red regions.…”

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

“…Due to their promising emitting features, these complexes have also been employed as phosphors in optoelectronic devices [71–72]. Neutral platinum(II) complexes with an asymmetrical triazolate- and tetrazolate-containing tridentate ligand, complexes 28 , were also reported [75] (Fig. 15).…”

“…Chemical structure of the asymmetric Pt(II) derivatives 28 bearing triazole and tetrazole moieties onto a tridentate ligand [75]. …”

Solution-processed OLEDs based on phosphorescent PtAu2 complexes with phenothiazine-functionalized acetylides

“…[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Compared with most of mononuclear cyclometallated iridium(II) and platinum(II) complexes used in OLEDs, many polynuclear metal cluster complexes are more readily available in mild conditions and exhibit higher thermal and photochemical stability due to additional metal-metal interaction with the energy comparable to hydrogen bond (25-40 kJ mol -1 ). [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Compared with most of mononuclear cyclometallated iridium(II) and platinum(II) complexes used in OLEDs, many polynuclear metal cluster complexes are more readily available in mild conditions and exhibit higher thermal and photochemical stability due to additional metal-metal interaction with the energy comparable to hydrogen bond (25-40 kJ mol -1 ).…”