Blue phosphorescent emitters: new N-heterocyclic platinum(ii) tetracarbene complexes

Abstract

Photoluminescence measurements show that platinum(II) tetracarbene complexes, which could be obtained via different synthetic routes, are interesting lead structures for the development of blue emitters for PhOLEDs with good quantum yields and high photostability.

Blue phosphorescent platinum(ii) tetracarbene complexes with bis(triazoline-5-ylidene) ligands

“…46,53 Recently, we described the syntheses and photophysical properties of homoleptic and heteroleptic platinum(II)(bis(imidazoline-2-ylidene)) 2 complexes. [36][37][38] In this study we varied the substituents R and R¢ (Fig. 1, I), but the emission wavelengths turned out to be independent from the type of alkyl substituent.…”

A Convenient Approach to Luminescent Cyclometalated Platinum(II) Complexes with Organometallic π‐Bonded Benzenedithiolate

“…To this end various cyclometalated platinum complexes were described with β‐diketonate ligands, 8‐hydroxyquinolinate, carbenes, phosphinine coligand, and more recently with a phosphinoferrocene ligand . However cyclometalated platinum(II) complexes containing benzenedithiolate (bdt) as coligands are not very common, only two square planar anionic cyclometalated Pt II complexes [(C ^ N)Pt(S ^ S)][NBu 4 ] {(C ^ N = ppy = 2‐phenylpyridine; tbpiq = 4‐ tert ‐butylphenyl)isoquinoline; (S ^ S) = benzenedithiolate (bdt) } were described .…”

Beyond catalysis: N-heterocyclic carbene complexes as components for medicinal, luminescent, and functional materials applications

“…7). 24 These compounds emit in the deep blue region (λ = 386 nm) and have quantum yields up to 45% with a 235 photostability exceeding 180 min at an excitation wavelength of 325 nm. Unlike the emission wavelength, the quantum yields are considerably influenced upon variation of the wingtip substituents at nitrogen.…”